Claude Opus 5.5 在 AI Gateway 上可用
Claude Opus 5.5 now available on AI Gateway
Anthropic 的 Claude Opus 5.5 已在 AI Gateway 上上线，支持 1M-token 上下文窗口和 128K 输出 token。
与 Opus 5 相比，速度提升约 30%，成本降低约 40%。
Opus 5.5 在速度和成本上相较前代提升显著，适合需要大上下文和长任务的智能体工作，其 1M-token 上下文窗口和 128K 输出令长任务更易监督，且支持自动工具选择，提升开发效率。对开发者而言，Opus 5.5 的速度与成本优势可显著降低项目迭代周期。
Claude Opus 5.5 from Anthropic is now available on AI Gateway as anthropic/claude-opus-5.5.
Opus 5.5 is Anthropic’s strongest Opus model for agentic coding, long-running agent tasks, and professional knowledge work. It communicates progress, findings, and next steps clearly, making extended work easier to supervise.
It has a 1M-token context window and supports up to 128K output tokens. Compared with Opus 5, Anthropic has stated that Opus 5.5 performs at a similar level to Fable 5.1, but is ~30% faster and ~40% cheaper per task than Opus 5.
The new model includes two API changes that can turn previously valid requests into HTTP 400 errors:
Thinking is always adaptive. Requests that disable thinking or set a fixed thinking budget are rejected. Use an effort level and prompting to control reasoning depth.
Forced tool choice is unsupported. Requests cannot require a tool call or force a specific tool. Use automatic tool selection and prompt the model when it should call a tool. If you previously forced a tool call to return JSON, use structured outputs instead.
To use Claude Opus 5.5:
For lower latency, enable fast mode with speed: 'fast' or use anthropic/claude-opus-5.5-fast. In Claude Code, run /fast to toggle it for the session.
Opus 5.5 also supports regional inference and Zero Data Retention through AI Gateway. Try it in the model playground.
來源：Vercel Blog · vercel.com