What happened
Analysis and impact
速度提升的具体参数
根据 OpenAI Blog 公布的信息，Ultrafast 模式的核心指标有两个：一是整体运行速度达到 GPT-5.6 Sol 标准模式的 14 倍，二是输出吞吐量上限为每秒 750 个 token。这一输出速率意味着，对于需要长文本生成或实时交互的应用场景，响应等待时间将大幅缩短。原文未提供输入侧的处理速度数据，也未说明该模式在延迟（首 token 时间）方面的具体表现。
算力合作背景
Ultrafast 模式的算力由 Cerebras 提供。Cerebras 以晶圆级芯片（Wafer-Scale Engine）闻名，其硬件设计思路与传统 GPU 集群不同，强调单芯片上极高的片上带宽和并行计算能力。此次合作表明 OpenAI 在自有算力基础设施之外，正在引入第三方推理硬件来扩展服务能力。原文未披露双方合作的商业条款、部署规模或地域覆盖范围，也未说明 Ultrafast 模式是否会在 ChatGPT 消费端产品中提供，目前公开信息仅指向 API 服务层级。
对开发者的意义
对于 API 用户而言，14 倍的速度提升主要影响两类场景：一是需要批量处理大量请求的任务，例如内容审核、数据标注或大规模文本生成；二是对实时性要求较高的交互式应用，如语音助手、代码补全或游戏内 AI 对话。更快的输出速度可以在相同时间内处理更多请求，从而降低单位任务的等待成本。不过，原文未提及 Ultrafast 模式的定价方案，也未说明与标准模式相比是否存在精度或功能上的取舍，这些细节有待后续公布。
References
Original source text
August 13, 2026
Previewing Ultrafast mode: GPT‑5.6 Sol at up to 14X the speed
A new speed class for frontier intelligence, turning speed into a competitive advantage.
Loading… Share Today, we’re sharing an early look at Ultrafast, a new service tier that runs GPT‑5.6 Sol up to 14× faster than Standard processing, launching first in the OpenAI API. Powered by Cerebras, Ultrafast generates up to 750 output tokens per second, bringing our most intelligent model to products and workflows where every second matters.
With GPT‑5.6 , we’re pushing the frontier on what our models can do and making them more efficient across every layer of our stack. Those improvements have made advanced intelligence more affordable and more useful to more people . Until now, getting real-time speed typically meant choosing a smaller or more specialized model. Ultrafast points to progress in a new direction: more useful work per second.
When speed no longer requires giving up intelligence, AI can move into the most time-sensitive parts of a business and new kinds of work become possible. We’ve already seen some encouraging scenarios for Ultrafast:
- Incident response and reliability: When a critical system fails, analyze application logs, recent code changes, and engineer reports to identify the likely cause and help prepare a fix while the outage is still unfolding.
- Financial research and security: Analyze market signals, assess transactions, and identify suspicious activity while conditions are still changing.
- Customer support and voice: Resolve complex customer issues in real time without interrupting the conversation, even when finding the answer requires multiple steps or systems.
- Commerce: Answer product questions, check inventory, personalize recommendations, and resolve checkout issues while the shopper is still deciding, before hesitation becomes an abandoned cart.
Live research and experimentation: Turn research that previously took an overnight run into an interactive working session, letting teams test an idea, examine the results, adjust their approach, and run another experiment without breaking their flow. During the preview period, we’re working with an initial group of customers to understand where this speed makes the biggest difference, and how those learnings can inform our products over time. If your business requires frontier intelligence at the highest speed, you can sign up to get notified when access expands .
GPT‑5.6 Sol Ultrafast and standard build a working 3D warehouse simulator from the same text prompt, side by side.
What early customers are experiencing
We’ve been testing GPT‑5.6 Sol on Ultrafast mode with an initial group of companies across coding, commerce, financial research, support, and other interactive applications. Starting with business workflows lets us study these conditions in real production environments. Their early work is helping us understand where an order-of-magnitude change in speed creates the most value and how products change when the model can keep pace with the person using it. We will use these findings to guide deployment as capacity grows.
1 of 4 “ The increase in speed brought by Cerebras is impressive. It enables different ways of using the models, and makes it practical for developers to work in a more focused and productive way alongside them. ” —John Crepezzi, AI Assistants, Jane Street “ For us the Ultrafast has been invaluable in our voice stack. The speed completely changes the call experience for the more complex work. ” —Courtland Lykins, Product Lead—Voice AI, Podium “ Ultrafast allows us to create synchronous experiences for users that were previously limited by intelligence. Oftentimes the barrier to truly fast products is not just tokens per second, but also model intelligence, and ultrafast combines both. ” —Mitch Troyanovsky, Co-Founder, Basis “ Speed doesn’t just make the product feel better. It changes what people can realistically use it for. Ultrafast makes complex financial research feel like a real-time interaction. ” —Alex Wang, Applied AI, Rogo
- Jane Street
- Podium
- Basis
- Rogo
- Jane Street
- Podium
- Basis
- Rogo
How OpenAI is using Ultrafast
Inside OpenAI, a group of developers has been testing GPT‑5.6 Sol on Ultrafast mode to understand which workflows benefit from frontier intelligence that can answer in real-time.
Incident response is one example where our team is using Ultrafast. When an alert fires, engineers need to build an accurate picture while the system and the evidence are still changing. Teams use it to quickly read logs, analyze traces, synthesize conversations, identify the next checks, and help prepare or validate a fix—all in a fraction of the time with the intelligence of Sol. It reduces the delay between observing a signal, testing a hypothesis, and choosing the next action, while engineers remain responsible for judgment and deployment.
For research, our team uses Ultrafast to rapidly search knowledge sources, query data, and quickly gather, organize, and summarize information across connected tools. A common workflow in research is for our team members to launch a batch of experiments over night, and review the results in the morning. With Ultrafast, we see this loop tightening to support multiple iterations during the workday instead.
Powered by Cerebras
Ultrafast marks the next step in our partnership with Cerebras to bring ultra-low-latency inference to OpenAI’s platform. Now, with GPT‑5.6 Sol on Ultrafast mode, Cerebras is supporting OpenAI’s most intelligent model, delivering up to 750 output tokens per second, enabling businesses to build more responsive products, make faster decisions, and bring powerful AI directly into their most demanding workflows.
Availability
GPT‑5.6 Sol on Ultrafast mode is available in a limited preview today to a select group of customers. We’ll expand access as capacity grows. Sign up for updates .
Author
OpenAI
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