{"id":658463,"date":"2026-09-16T14:08:49","date_gmt":"2026-09-16T12:08:49","guid":{"rendered":"https://aivancity.ai/blog/?p=658463"},"modified":"2026-10-07T14:27:12","modified_gmt":"2026-10-07T12:27:12","slug":"gpt-5-6-sol-accelere-x10-openai-devoile-son-nouveau-mode-ultrafast","status":"publish","type":"post","link":"https://aivancity.ai/blog/gpt-5-6-sol-accelere-x10-openai-devoile-son-nouveau-mode-ultrafast/","title":{"rendered":"GPT-5.6 Sol accélère x10 : OpenAI dévoile son nouveau mode Ultrafast"},"content":{"rendered":"\n<p class=\"text-justify wp-block-paragraph\">A few weeks after rolling out GPT-5.6 on a large scale, OpenAI is tackling another major challenge in artificial intelligence: latency. With its new <strong>Ultrafast</strong> mode, the company aims to enable its flagship model, GPT-5.6 Sol, to generate responses at a speed previously associated mainly with much lighter models. The advertised throughput can reach <strong>750 tokens per second</strong>, while retaining the same model and thus, according to OpenAI, without sacrificing its reasoning capabilities.¹ This acceleration might seem purely technical, but it actually addresses a key challenge in agent-based AI. When an agent must analyze information, call upon multiple tools, verify a result, and then continue its work, every second of latency compounds as the process progresses. With Ultrafast, OpenAI specifically aims to reduce this wait time and bring AI agents closer to true real-time execution.</p>\n\n\n\n<h2 class=\"wp-block-heading has-text-color has-link-color wp-elements-1\" style=\"color:#986e13\">750 tokens per second: GPT-5.6 Sol changes pace</h2>\n\n\n\n<p class=\"text-justify wp-block-paragraph\">GPT-5.6 Sol is the most powerful model in the GPT-5.6 family, ahead of Terra and Luna, and is designed for complex tasks in programming, research, cybersecurity, science, and automation. OpenAI had previously announced that it runs on Cerebras’ infrastructure at speeds of up to <strong>750 tokens per second</strong>—a level far exceeding that of traditional inference.¹ The appeal of Ultrafast lies primarily in the fact that OpenAI does not present this acceleration as a new, streamlined version of the model. The concept involves running GPT-5.6 Sol on infrastructure specifically optimized for ultra-low-latency inference, in order to maintain its level of intelligence while significantly reducing the time required for generation.</p>\n\n\n\n<p class=\"text-justify wp-block-paragraph\">The difference from traditional acceleration methods is significant. Until now, achieving a faster response often meant choosing a smaller model or reducing the reasoning effort. Ultrafast, on the other hand, seeks to further decouple <strong>intelligence from speed</strong> by optimizing the infrastructure that runs the model. In practice, reaching 750 tokens per second means that long responses can appear almost instantly once generation begins. The actual result, however, depends on many factors, including initial reasoning time, context length, calls to external tools, and infrastructure load. OpenAI also notes that actual performance may vary depending on<a href=\"#ref1\" data-type=\"internal\" data-id=\"#ref1\"> workloads.¹</a></p>\n\n\n\n<style>\n.aiv10-pill{display:flex;align-items:center;gap:4px;background:rgba(255,255,255,0.07);border:1px solid rgba(255,255,255,0.11);border-radius:20px;padding:4px 10px;font-size:11.5px;color:rgba(255,255,255,0.72);white-space:nowrap;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;}\n.aiv10-pill svg{width:11px;height:11px;flex-shrink:0;stroke:#3986e1;}\n.aiv10-cta:hover{background:#2f72c8 !important;}\n.aiv10-badge-inner{display:inline-flex;align-items:center;gap:5px;background:rgba(57,134,225,0.12);border:1px solid rgba(57,134,225,0.35);border-radius:20px;padding:3px 10px;}\n.aiv10-badge-dot{width:5px;height:5px;border-radius:50%;background:#3986e1;display:inline-block;flex-shrink:0;}\n@media(max-width:640px){\n  .aiv10-responsive{flex-direction:column !important;}\n  .aiv10-img-wrap{width:100% !important;height:180px !important;}\n  .aiv10-img-overlay{background:linear-gradient(to bottom,rgba(35,38,65,0) 30%,rgba(35,38,65,1) 100%) !important;}\n  .aiv10-body-wrap{padding:18px 20px 24px !important;}\n  .aiv10-logo-img{width:150px !important;}\n  .aiv10-cta{width:100% !important;text-align:center !important;display:block !important;}\n  .aiv10-badge-hide{display:none !important;}\n}\n</style>\n\n<div style=\"background:#232641;border-radius:16px;overflow:hidden;margin:40px 0;box-sizing:border-box;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;\">\n  <div class=\"aiv10-responsive\" style=\"display:flex !important;flex-direction:row !important;min-height:240px;\">\n\n    <div class=\"aiv10-img-wrap\" style=\"width:42% !important;flex-shrink:0 !important;position:relative;overflow:hidden;\">\n      <img decoding=\"async\" src=\"https://aivancity.ai/en/sites/default/files/2025-11/vignette-msc-ia-gen.jpg\" alt=\"MSc in Generative and Agent-Based AI at aivancity\" style=\"width:100% !important;height:100% !important;object-fit:cover !important;object-position:center top !important;display:block !important;filter:brightness(0.9);\">\n      <div class=\"aiv10-img-overlay\" style=\"position:absolute;inset:0;background:linear-gradient(to right,rgba(35,38,65,0) 40%,rgba(35,38,65,0.7) 75%,rgba(35,38,65,1) 100%);\"></div>\n    </div>\n\n    <div class=\"aiv10-body-wrap\" style=\"flex:1;padding:26px 32px 26px 22px;display:flex !important;flex-direction:column !important;justify-content:space-between;gap:14px;position:relative;z-index:1;box-sizing:border-box;\">\n\n      <img decoding=\"async\" class=\"aiv10-logo-img\" src=\"https://aivancity.ai/en/blog/wp-content/uploads/2026/05/BLANC-FRANCAIS-COMPLET.png\" alt=\"aivancity\" style=\"width:170px !important;height:auto !important;display:block !important;max-width:170px !important;opacity:0.95;\">\n\n      <div style=\"display:flex;flex-direction:column;gap:10px;flex:1;justify-content:center;\">\n        <h2 style=\"font-size:22px;font-weight:700;color:#fff;line-height:1.25;margin:0;\">MSc <span style=\"color:#3986e1;\">in Generative</span>,<br/>, and Agent-Based <span style=\"color:#3986e1;\" data-wg-splitted>AI</span></h2>\n        <p style=\"font-size:13px;color:rgba(255,255,255,0.58);line-height:1.55;max-width:400px;margin:0;\">Become an expert in generative and agent-based AI: LLMs, transformers, and enterprise deployment. Includes a learning trip to Silicon Valley. RNCP Level 7 certification (equivalent to a 6-year post-secondary degree).</p>\n        <div style=\"display:flex;flex-wrap:wrap;gap:6px;\">\n          <span class=\"aiv10-pill\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke-width=\"2\"><circle cx=\"12\" cy=\"12\" r=\"10\"></circle><polyline points=\"12 6 12 12 16 14\"></polyline></svg>12 months — 6 years of post-secondary education</span>\n          <span class=\"aiv10-pill\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke-width=\"2\"><path d=\"M17 21v-2a4 4 0 0 0-4-4H5a4 4 0 0 0-4 4v2\"></path><circle cx=\"9\" cy=\"7\" r=\"4\"></circle></svg>Master's degree (Bac+5) with experience</span>\n          <span class=\"aiv10-pill\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke-width=\"2\"><polyline points=\"20 6 9 17 4 12\"></polyline></svg>Part-time — Fridays &amp; Saturdays</span>\n          <span class=\"aiv10-pill\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke-width=\"2\"><path d=\"M12 2C8.13 2 5 5.13 5 9c0 5.25 7 13 7 13s7-7.75 7-13c0-3.87-3.13-7-7-7z\"></path><circle cx=\"12\" cy=\"9\" r=\"2.5\"></circle></svg>Paris-Villejuif Campus</span>\n        </div>\n      </div>\n\n      <div style=\"display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:10px;\">\n        <a class=\"aiv10-cta\" href=\"https://aivancity.ai/en/program/msc-intelligences-artificielles-generatives/presentation\" target=\"_blank\" rel=\"noopener noreferrer\" style=\"background:#3986e1 !important;color:#fff !important;font-size:13.5px;font-weight:600;padding:10px 24px;border-radius:8px;text-decoration:none !important;white-space:nowrap;display:inline-block !important;\">\n          Learn more about the program →\n        </a>\n        <span class=\"aiv10-badge-hide aiv10-badge-inner\">\n          <span class=\"aiv10-badge-dot\"></span>\n          <span style=\"font-size:10.5px;color:#3986e1;font-weight:600;letter-spacing:0.04em;text-transform:uppercase;\">RNCP Level 7 Certification</span>\n        </span>\n      </div>\n\n    </div>\n  </div>\n</div>\n\n\n\n<h2 class=\"wp-block-heading has-text-color has-link-color wp-elements-2\" style=\"color:#986e13\">Cerebras, the engine behind this acceleration</h2>\n\n\n\n<p class=\"text-justify wp-block-paragraph\">To achieve this level of performance, OpenAI relies on <strong>Cerebras Systems</strong>, a U.S. company specializing in processors designed for artificial intelligence. Its approach differs from that of traditional GPU infrastructure: Cerebras develops processors on the scale of an entire silicon wafer—known as <strong>Wafer-Scale Engines</strong>—to bring memory and computing units closer together and reduce data transfers that slow down inference.²</p>\n\n\n\n<p class=\"text-justify wp-block-paragraph\">This collaboration goes far beyond the launch of a simple fast mode. In 2026, OpenAI and Cerebras entered into a multi-year agreement to deploy <strong>750 MW of inference capacity</strong>, with a gradual ramp-up of the infrastructure through 2028.<a href=\"#ref2\" data-type=\"internal\" data-id=\"#ref2\">² The </a>exact amount associated with the partnership has varied across announcements and financial documents, but it runs into the tens of billions of dollars, demonstrating the strategic importance OpenAI places on high-speed inference.<a href=\"#ref3\" data-type=\"internal\" data-id=\"#ref3\">³</a> Behind Ultrafast, a more profound shift in the market is taking shape: after several years spent training increasingly powerful models, research labs are now seeking to optimize how these models operate once deployed.</p>\n\n\n\n<h2 class=\"wp-block-heading has-text-color has-link-color wp-elements-3\" style=\"color:#986e13\">AI agents could be the first big winners</h2>\n\n\n\n<p class=\"text-justify wp-block-paragraph\">In a typical conversation with ChatGPT, saving a few seconds mainly makes the experience more comfortable. For an <strong>agent-based AI</strong>, the impact can be much greater. An autonomous agent doesn’t necessarily generate just one response. It can search for information, analyze a file, query a database, execute code, verify the result, and then repeat the process until it achieves its goal. Each step engages the model and adds latency to the overall workflow.</p>\n\n\n\n<p class=\"text-justify wp-block-paragraph\">With much faster inference, these workflows can become significantly smoother. A developer could task an agent with analyzing logs and searching for an error while another prepares a fix. A financial analyst could analyze multiple sources simultaneously before generating a summary. In customer support or voice interfaces, reduced latency could make interactions with artificial intelligence feel much more natural. OpenAI is already positioning GPT-5.6 Sol as a particularly high-performing model for agent-based tasks and software development, notably thanks to its results on Terminal-Bench, coding agent evaluations, and long-term professional workflows<a href=\"#ref4\" data-type=\"internal\" data-id=\"#ref4\">.⁴</a></p>\n\n\n\n<p class=\"text-justify wp-block-paragraph\">However, speed does not eliminate all bottlenecks. An agent remains dependent on the time required to access an API, load a document, perform a search, or obtain human validation. Ultrafast accelerates the reasoning engine, but it does not instantly speed up the entire IT system surrounding it. That is why the benefits will likely be most noticeable in applications where inference currently accounts for a significant portion of the total execution time.</p>\n\n\n\n<style>\n.aiv13-pill{display:flex;align-items:center;gap:4px;background:rgba(255,255,255,0.07);border:1px solid rgba(255,255,255,0.11);border-radius:20px;padding:4px 10px;font-size:11.5px;color:rgba(255,255,255,0.72);white-space:nowrap;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;}\n.aiv13-pill svg{width:11px;height:11px;flex-shrink:0;stroke:#3986e1;}\n.aiv13-cta:hover{background:#2f72c8 !important;}\n.aiv13-badge-inner{display:inline-flex;align-items:center;gap:5px;background:rgba(57,134,225,0.12);border:1px solid rgba(57,134,225,0.35);border-radius:20px;padding:3px 10px;}\n.aiv13-badge-dot{width:5px;height:5px;border-radius:50%;background:#3986e1;display:inline-block;flex-shrink:0;}\n@media(max-width:640px){\n  .aiv13-responsive{flex-direction:column !important;}\n  .aiv13-img-wrap{width:100% !important;height:180px !important;}\n  .aiv13-img-overlay{background:linear-gradient(to bottom,rgba(35,38,65,0) 30%,rgba(35,38,65,1) 100%) !important;}\n  .aiv13-body-wrap{padding:18px 20px 24px !important;}\n  .aiv13-logo-img{width:150px !important;}\n  .aiv13-cta{width:100% !important;text-align:center !important;display:block !important;}\n  .aiv13-badge-hide{display:none !important;}\n}\n</style>\n\n<div style=\"background:#232641;border-radius:16px;overflow:hidden;margin:40px 0;box-sizing:border-box;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;\">\n  <div class=\"aiv13-responsive\" style=\"display:flex !important;flex-direction:row !important;min-height:240px;\">\n\n    <div class=\"aiv13-img-wrap\" style=\"width:42% !important;flex-shrink:0 !important;position:relative;overflow:hidden;\">\n      <img decoding=\"async\" src=\"https://aivancity.ai/en/sites/default/files/2026-09/emba-card.webp\" alt=\"Executive MBA in AI &amp; Business Transformation, aivancity\" style=\"width:100% !important;height:100% !important;object-fit:cover !important;object-position:center top !important;display:block !important;filter:brightness(0.9);\">\n      <div class=\"aiv13-img-overlay\" style=\"position:absolute;inset:0;background:linear-gradient(to right,rgba(35,38,65,0) 40%,rgba(35,38,65,0.7) 75%,rgba(35,38,65,1) 100%);\"></div>\n    </div>\n\n    <div class=\"aiv13-body-wrap\" style=\"flex:1;padding:26px 32px 26px 22px;display:flex !important;flex-direction:column !important;justify-content:space-between;gap:14px;position:relative;z-index:1;box-sizing:border-box;\">\n\n      <img decoding=\"async\" class=\"aiv13-logo-img\" src=\"https://aivancity.ai/en/blog/wp-content/uploads/2026/05/BLANC-FRANCAIS-COMPLET.png\" alt=\"aivancity\" style=\"width:170px !important;height:auto !important;display:block !important;max-width:170px !important;opacity:0.95;\">\n\n      <div style=\"display:flex;flex-direction:column;gap:10px;flex:1;justify-content:center;\">\n        <h2 style=\"font-size:22px;font-weight:700;color:#fff;line-height:1.25;margin:0;\">Executive MBA in <span style=\"color:#3986e1;\">AI & Business Transformation<br/></span></h2>\n        <p style=\"font-size:13px;color:rgba(255,255,255,0.58);line-height:1.55;max-width:400px;margin:0;\">The MBA Redesigned for the Age of AI. For experienced executives who want to lead the transformation of their organizations. Paris, Nice, and Dubai.</p>\n        <div style=\"display:flex;flex-wrap:wrap;gap:6px;\">\n          <span class=\"aiv13-pill\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke-width=\"2\"><circle cx=\"12\" cy=\"12\" r=\"10\"></circle><polyline points=\"12 6 12 12 16 14\"></polyline></svg>12 months — Part-time</span>\n          <span class=\"aiv13-pill\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke-width=\"2\"><path d=\"M17 21v-2a4 4 0 0 0-4-4H5a4 4 0 0 0-4 4v2\"></path><circle cx=\"9\" cy=\"7\" r=\"4\"></circle></svg>At least 10 years of experience</span>\n          <span class=\"aiv13-pill\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke-width=\"2\"><polyline points=\"20 6 9 17 4 12\"></polyline></svg>Early bird: 20,000 €</span>\n          <span class=\"aiv13-pill\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke-width=\"2\"><path d=\"M12 2C8.13 2 5 5.13 5 9c0 5.25 7 13 7 13s7-7.75 7-13c0-3.87-3.13-7-7-7z\"></path><circle cx=\"12\" cy=\"9\" r=\"2.5\"></circle></svg>Paris · Nice · Dubai</span>\n        </div>\n      </div>\n\n      <div style=\"display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:10px;\">\n        <a class=\"aiv13-cta\" href=\"https://aivancity.ai/en/formations-professionnel/executive-mba-ai-business-transformation\" target=\"_blank\" rel=\"noopener noreferrer\" style=\"background:#3986e1 !important;color:#fff !important;font-size:13.5px;font-weight:600;padding:10px 24px;border-radius:8px;text-decoration:none !important;white-space:nowrap;display:inline-block !important;\">\n          Learn more about the program →\n        </a>\n        <span class=\"aiv13-badge-hide aiv13-badge-inner\">\n          <span class=\"aiv13-badge-dot\"></span>\n          <span style=\"font-size:10.5px;color:#3986e1;font-weight:600;letter-spacing:0.04em;text-transform:uppercase;\">100% in English</span>\n        </span>\n      </div>\n\n    </div>\n  </div>\n</div>\n\n\n\n<h2 class=\"wp-block-heading has-text-color has-link-color wp-elements-4\" style=\"color:#986e13\">A very fast mode, but one that is still far from being accessible to everyone</h2>\n\n\n\n<p class=\"text-justify wp-block-paragraph\">This is where Ultrafast’s promise reaches its main limit. An infrastructure capable of running a boundary model at several hundred tokens per second requires considerable hardware capacity. When GPT-5.6 was launched, OpenAI had already indicated that access to Sol execution on Cerebras would initially be limited to <strong>certain customers</strong>, while the available capacity was gradually increased<a href=\"#ref1\" data-type=\"internal\" data-id=\"#ref1\">.¹</a></p>\n\n\n\n<p class=\"text-justify wp-block-paragraph\">This situation stands in contrast to OpenAI’s broader strategy surrounding GPT-5.6. The family is now available on a much wider scale, with Sol as the flagship model, Terra to balance performance and cost, and Luna as a faster and more cost-effective option. GPT-5.6 Sol is priced <strong>at $5 per million input tokens and $30 per million output tokens</strong> via the API, while Terra costs $2.50 and $15, respectively, and Luna costs $1 and $6.⁴ Access to certain advanced capabilities also depends on the ChatGPT or Codex plan used. For example, OpenAI is gradually rolling out GPT-5.6 Sol to eligible plans, while the most advanced reasoning options are reserved for certain subscriptions.<a href=\"#ref5\" data-type=\"internal\" data-id=\"#ref5\">⁵</a></p>\n\n\n\n<p class=\"text-justify wp-block-paragraph\">For Ultrafast, the real challenge will therefore be as much economic as it is technological. If the cost of this acceleration is high, it will be most relevant for applications where every second has direct value: real-time assistance, interactive software development, incident response, chatbots, transactions, or operational analysis. For background processes, such as document indexing or overnight analyses, a less expensive standard mode might remain a much more practical option.</p>\n\n\n\n<h2 class=\"wp-block-heading has-text-color has-link-color wp-elements-5\" style=\"color:#986e13\">OpenAI Is Preparing for a New Battle Over Inference</h2>\n\n\n\n<p class=\"text-justify wp-block-paragraph\">The partnership with Cerebras also signals a shift in the dynamics of competition among artificial intelligence players. Until now, the race was primarily measured by the size of models, their benchmark performance, or their ability to reason. Now, <strong>the time it takes to achieve this level of intelligence is itself becoming a competitive advantage</strong>.</p>\n\n\n\n<p class=\"text-justify wp-block-paragraph\">For OpenAI, working with Cerebras also allows it to diversify its computing infrastructure in a market historically dominated by Nvidia GPUs. Cerebras claims that its specialized architectures help reduce certain bottlenecks related to data movement and achieve particularly high throughput for inference.<a href=\"#ref2\" data-type=\"internal\" data-id=\"#ref2\">²</a> OpenAI is not replacing its existing infrastructure, but is adding a new category of resources optimized for workloads where latency is critical.</p>\n\n\n\n<p class=\"wp-block-paragraph\">This trend could gradually change the way companies choose their models. The best AI will no longer necessarily be the one that achieves the highest absolute score on a benchmark, but rather the one that offers the best balance between <strong>quality, cost, token consumption, and execution time</strong>.</p>\n\n\n\n<h2 class=\"wp-block-heading has-text-color has-link-color wp-elements-6\" style=\"color:#986e13\">Ethical Issues: When Speed Also Reduces the Time Available for Oversight</h2>\n\n\n\n<p class=\"text-justify wp-block-paragraph\">Making artificial intelligence ten times faster is not just a technical advancement. The faster agents can analyze, decide, and act, the more important the issue of human oversight becomes. In a traditional agent-based system, latency still allows time to verify an action, interrupt a process, or request validation. When multiple agents can chain together decisions in a matter of seconds, this window for intervention can shrink considerably.</p>\n\n\n\n<p class=\"text-justify wp-block-paragraph\">This issue is particularly sensitive in cybersecurity, finance, critical infrastructure, and automated administrative processes. GPT-5.6 Sol already has advanced cybersecurity capabilities, and OpenAI acknowledges that evaluations cannot cover all possible combinations of models, tools, and workflows. The company states that it has strengthened its security mechanisms with real-time controls, monitoring, human and automated red teaming, and risk-based access<a href=\"#ref1\" data-type=\"internal\" data-id=\"#ref1\"> controls.¹</a></p>\n\n\n\n<p class=\"text-justify wp-block-paragraph\">A second challenge concerns <strong>unequal access to computing power</strong>. If the fastest versions of the best models remain available only to large companies that can afford premium infrastructure, a gap could widen between organizations with near-instantaneous agents and those using slower systems. Speed would then become an economic advantage in its own right, just like access to the most powerful models.</p>\n\n\n\n<p class=\"text-justify wp-block-paragraph\">Finally, this acceleration raises an environmental concern. The infrastructure needed to run state-of-the-art models at very high speeds consumes a considerable amount of electricity. The 750 MW agreement between OpenAI and Cerebras illustrates the industrial scale now required to operate modern AI systems.<a href=\"#ref2\" data-type=\"internal\" data-id=\"#ref2\">²</a> The race for lower latency will therefore need to be evaluated not only in terms of tokens per second, but also in terms of energy efficiency and the actual value produced by each computation.</p>\n\n\n\n<h2 class=\"wp-block-heading has-text-color has-link-color wp-elements-7\" style=\"color:#986e13\">After intelligence, the race for speed is on</h2>\n\n\n\n<p class=\"text-justify wp-block-paragraph\">With Ultrafast, OpenAI demonstrates that the next frontier in artificial intelligence is no longer just about making models smarter. It’s also about making that intelligence fast enough to keep pace with human activities and computer systems. GPT-5.6 Sol can already reason, code, use tools, and coordinate complex workflows. By achieving up to 750 tokens per second on the Cerebras infrastructure, these capabilities can now be harnessed with significantly reduced latency<a href=\"#ref1\" data-type=\"internal\" data-id=\"#ref1\">.¹</a></p>\n\n\n\n<p class=\"text-justify wp-block-paragraph\">This development could be particularly significant for AI agents, whose effectiveness depends as much on their reasoning ability as on the time required to complete each step. But Ultrafast also highlights new tensions within the industry: infrastructure costs, unequal access to premium capabilities, energy consumption, and the need to maintain human oversight as automated systems act ever more quickly. The next competition between OpenAI, Anthropic, Google, and other labs may therefore no longer focus solely on the question “Which AI is the smartest?” but also on another, increasingly critical one: <strong>How long must we wait for it to act?</strong></p>\n\n\n\n<style>\n  .aivan-box{\n    max-width:980px;\n    margin:16px 0;\n    padding:22px 20px 18px;\n    background:linear-gradient(180deg,#ffffff 0%,#fafcff 100%);\n    border:1px solid rgba(0,100,198,.15);\n    border-left:6px solid #0064C6;\n    border-radius:14px;\n    box-shadow:0 10px 30px rgba(10,20,60,.06);\n    font-family:system-ui,-apple-system,\"Segoe UI\",Roboto,Arial,sans-serif;\n    color:#111827;\n  }\n\n  .aivan-box__header{\n    display:flex;\n    flex-direction:column;\n    align-items:center;\n    gap:12px;\n    margin-bottom:18px;\n  }\n\n  .aivan-badge{\n    display:inline-flex;\n    align-items:center;\n    justify-content:center;\n    padding:6px 14px;\n    background:rgba(0,100,198,.08);\n    color:#0064C6;\n    border:1px solid rgba(0,100,198,.25);\n    border-radius:999px;\n    font-weight:700;\n    font-size:13px;\n    white-space:nowrap;\n  }\n\n  .aivan-box h3{\n    margin:0;\n    text-align:center;\n    font-size:22px;\n    font-weight:700;\n    color:#0b1220;\n    line-height:1.3;\n  }\n\n  .aivan-box p{\n    margin:12px 0 0;\n    text-align:justify;\n    line-height:1.6;\n    font-size:15px;\n    color:#1f2937;\n  }\n\n  .aivan-card{\n    background:#ffffff;\n    border:1px solid rgba(17,24,39,.08);\n    border-radius:12px;\n    padding:16px;\n    margin-top:18px;\n  }\n\n  .aivan-card__title{\n    font-weight:700;\n    font-size:14px;\n    margin-bottom:12px;\n    color:#0064C6;\n  }\n\n  .aivan-list{\n    margin:0;\n    padding-left:18px;\n    line-height:1.6;\n    font-size:14.5px;\n    color:#1f2937;\n  }\n\n  .aivan-list li{\n    margin-bottom:8px;\n  }\n\n  .aivan-footer{\n    margin-top:18px;\n    padding-top:14px;\n    border-top:1px dashed rgba(0,100,198,.28);\n  }\n\n  .aivan-highlight{\n    margin-top:14px;\n    padding:12px 14px;\n    background:rgba(0,100,198,.07);\n    border-radius:10px;\n    font-size:14px;\n    font-weight:600;\n    color:#003a73;\n  }\n</style>\n\n<section class=\"aivan-box\">\n\n  <div class=\"aivan-box__header\">\n    <span class=\"aivan-badge\">Technology Framework</span>\n    <h3>How does GPT-5.6 Sol's Ultrafast mode work?</h3>\n  </div>\n\n  <p>\n    Ultrafast mode is a new execution option developed by <strong>OpenAI</strong> for <strong>GPT-5.6 Sol</strong>, with the goal of significantly reducing latency without replacing the model with a lighter version. Unlike approaches that prioritize speed by reducing reasoning capabilities, Ultrafast retains GPT-5.6 Sol while optimizing the infrastructure used for its inference. The system can thus <strong>generate</strong> up to <strong data-wg-splitted>750 tokens per second</strong>, which significantly speeds up the production of long responses and the execution of tasks requiring multiple successive interactions with the model.\n  </p>\n\n  <p>\n    This acceleration relies in particular on the infrastructure of <strong>Cerebras Systems</strong>, which specializes in processors designed for artificial intelligence. Its <strong>Wafer-Scale Engine</strong> architecture utilizes a very large silicon die combined with memory placed as close as possible to the computing units. This design aims to minimize the constant data transfers between the processor and external memory, which are one of the main factors slowing down the inference of large language models.\n  </p>\n\n  <p>\n    Ultrafast plays a particularly important role in the field of<strong>agent-based AI</strong>. An agent does not necessarily produce a single response; it can analyze a request, consult multiple tools, execute code, examine a result, correct an error, and then continue its work. Each step potentially requires a new call to the model. By accelerating GPT-5.6 Sol, OpenAI is therefore seeking to reduce the duration of these successive loops and bring certain agent-based workflows closer to real-time execution.\n  </p>\n\n  <p>\n    This approach could be particularly useful for software development, data analysis, conversational support, financial research, and incident response. However, the model’s speed does not eliminate other sources of latency. Calls to external APIs, database access, document loading, and human validation can still slow down the overall workflow. Ultrafast therefore primarily accelerates the part of the process directly related to GPT-5.6 Sol inference.\n  </p>\n\n  <div class=\"aivan-card\">\n    <div class=\"aivan-card__title\">Key Features of Ultrafast Mode</div>\n\n    <ul class=\"aivan-list\">\n      <li><strong>Ultra-high-speed inference:</strong> generation of up to 750 tokens per second, depending on usage conditions</li>\n\n      <li><strong>GPT-5.6 Saved:</strong> Acceleration of the flagship model without any announced plans to use a lighter version</li>\n\n      <li><strong>Cerebras Infrastructure:</strong> Using a Specialized Hardware Architecture to Reduce Data Movement and Latency</li>\n\n      <li><strong>Optimizing AI Agents:</strong> Accelerating Reasoning, Tool Use, Verification, and Execution Loops</li>\n\n      <li><strong>Software development:</strong> the ability to make workflows for code generation, analysis, and correction more interactive</li>\n\n      <li><strong>Real-time applications:</strong> useful for voice assistants, customer support, operational analytics, and incident response</li>\n\n      <li><strong>API Integration:</strong> A mode designed for professional use and for applications that leverage GPT-5.6 Sol through the OpenAI ecosystem</li>\n    </ul>\n  </div>\n\n  <div class=\"aivan-card\">\n    <div class=\"aivan-card__title\">Technical constraints and limitations</div>\n\n    <ul class=\"aivan-list\">\n      <li>Ultrafast still relies on specialized and significant computing capabilities, which may limit its large-scale deployment</li>\n\n      <li>Access remains restricted, and its opening depends on the availability of infrastructure capacity</li>\n\n      <li>The advertised maximum data rate does not necessarily correspond to the actual speed achieved in all situations</li>\n\n      <li>Calls to tools, APIs, databases, or external systems may continue to slow down agent workflows</li>\n\n      <li>An increase in processing speed does not automatically guarantee improved accuracy or reliability of the responses</li>\n\n      <li>Systems that operate more quickly require appropriate monitoring mechanisms, particularly when agents can perform several successive autonomous actions</li>\n\n      <li>The cost and availability of large-scale infrastructure are key factors in the adoption of this approach by businesses</li>\n    </ul>\n  </div>\n\n  <div class=\"aivan-footer\">\n\n    <p>\n      From a technological standpoint, Ultrafast mode represents a significant development in the competition among the major players in artificial intelligence. After several years spent primarily on improving the reasoning capabilities and performance of models, research labs are now seeking to optimize <strong>inference</strong>—that is, the phase during which a pre-trained model processes a query and generates a response. In this new race, speed is becoming almost as strategic as the power of the model itself.\n    </p>\n\n    <p>\n      This trend becomes even more significant with the development of AI agents. A highly effective but slow model can become difficult to use when a workflow requires dozens of successive steps. Conversely, very fast inference allows agents to perform multiple analyses, verifications, and interactions with various tools without forcing the user to wait several minutes. Ultrafast could thus help transform AI agents into much more responsive systems, capable of intervening directly in companies’ operational processes.\n    </p>\n\n    <p>\n      This acceleration, however, raises new governance challenges. The faster agents can think and act, the more validation, traceability, and human intervention mechanisms must be able to keep pace. Performance, therefore, cannot be evaluated solely in terms of tokens per second; it must also take into account the reliability of decisions, resource consumption, infrastructure costs, and organizations’ ability to maintain control over automated actions.\n    </p>\n\n    <div class=\"aivan-highlight\">\n      Key takeaway: Ultrafast mode marks a new milestone in the evolution of GPT-5.6 Sol by shifting the focus of AI competition toward execution speed. Thanks to Cerebras’ specialized infrastructure and a throughput of up to 750 tokens per second, OpenAI aims to make state-of-the-art models fast enough to power agents and interactive applications in real time. This breakthrough could transform the professional applications of agent-based AI, provided that the speed remains compatible with requirements for security, governance, and human oversight.\n    </div>\n\n  </div>\n\n</section>\n\n\n\n<h2 class=\"wp-block-heading has-text-color has-link-color wp-elements-8\" style=\"color:#0064c6\">Learn more </h2>\n\n\n\n<p class=\"text-justify wp-block-paragraph\">With its Ultrafast mode, GPT-5.6 Sol exemplifies the search for a new balance between reasoning power, execution speed, and user-friendliness in artificial intelligence models. On a related topic, check out our article <a href=\"https://aivancity.ai/en/blog/openai-lance-gpt-5-5-instant-avec-une-reduction-des-erreurs-et-des-reponses-plus-rapides/\">“OpenAI Launches GPT-5.5 Instant with Fewer Errors and Faster Responses</a>, <strong>”</strong> which analyzes the previous step in this evolution toward models capable of responding more quickly while improving the reliability of their results.</p>\n\n\n\n<h3 class=\"wp-block-heading text-justify has-text-color has-link-color wp-elements-9\" style=\"color:#5a5e83\">References</h3>\n\n\n\n<p id=\"ref1\" style=\"text-align:justify;\">1. OpenAI. (2026). Previewing GPT-5.6 Sol: A Next-Generation Model. <br/> <a href=\"https://openai.com/index/previewing-gpt-5-6-sol/\" target=\"_blank\">https://openai.com/index/previewing-gpt-5-6-sol/</a> </p>\n\n<p id=\"ref2\" style=\"text-align:justify;\">2. Cerebras Systems. (2026). OpenAI Partners with Cerebras to Bring High-Speed Inference to the Mainstream. <br/> <a href=\"https://www.cerebras.ai/blog/openai-partners-with-cerebras-to-bring-high-speed-inference-to-the-mainstream\" target=\"_blank\">https://www.cerebras.ai/blog/openai-partners-with-cerebras-to-bring-high-speed-inference-to-the-mainstream</a> </p>\n\n<p id=\"ref3\" style=\"text-align:justify;\">3. Reuters. (2026). OpenAI Signs $10 Billion Computing Deal with Nvidia Challenger Cerebras. <br/> <a href=\"https://www.reuters.com/\" target=\"_blank\">https://www.reuters.com/</a> </p>\n\n<p id=\"ref4\" style=\"text-align:justify;\">4. OpenAI. (2026). GPT-5.6: Frontier Intelligence That Scales with Your Ambition. <br/> <a href=\"https://openai.com/index/gpt-5-6/\" target=\"_blank\">https://openai.com/index/gpt-5-6/</a> </p>\n\n<p id=\"ref5\" style=\"text-align:justify;\">5. OpenAI Help Center. (2026). GPT-5.6 in ChatGPT. <br/> <a href=\"https://help.openai.com/en/articles/20001354-gpt-56-in-chatgpt/\" target=\"_blank\">https://help.openai.com/en/articles/20001354-gpt-56-in-chatgpt/</a> </p>\n","protected":false},"excerpt":{"rendered":"<p>A few weeks after rolling out GPT-5.6 on a large scale, OpenAI is tackling another major challenge in artificial intelligence: latency. With its new Ultrafast mode, the company aims to enable its flagship model, GPT-5.6 Sol, to produce…</p>\n","protected":false},"author":7,"featured_media":658562,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"content-type":"","footnotes":""},"categories":[44,38],"tags":[59],"class_list":["post-658463","post","type-post","status-publish","format-standard","has-post-thumbnail","category-avancees-technologiques-en-ia","category-ia-generatives","tag-parlonsia"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https://yoast.com/product/yoast-seo-wordpress/ -->\n<title>GPT-5.6 Sol Ultrafast: OpenAI Boosts Its AI Performance by Up to 10x</title>\n<meta name=\"description\" content=\"OpenAI unveils Ultrafast for GPT-5.6 Sol, with speeds of up to 750 tokens per second thanks to Cerebras. 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