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VercelRohan Taneja2 min readrelease notesintermediate

Claude Opus 5.5 now available on AI Gateway

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Summary

Claude Opus 5.5 is now on Vercel AI Gateway, delivering ~30% speed and ~40% cost gains over Opus 5, a 1 M‑token context, and breaking API changes that require adaptive thinking and structured outputs. It can be accessed via Vercel’s SDKs, OpenAI‑compatible endpoint, and coding agents, with optional fast mode and regional/ZDR controls.

  • Opus 5.5 is ~30% faster and ~40% cheaper per task than Opus 5, with a 1 M‑token context window and up to 128 K output tokens.
  • The model no longer accepts requests that disable thinking or force a tool call; steer behavior via effort, prompting, and structured outputs.
  • Vercel AI Gateway exposes the model through its SDKs, OpenAI‑compatible Chat Completions API, and coding agents, with an optional fast mode (`speed: 'fast'`).
  • Regional inference and Zero Data Retention can be enabled per request to meet compliance needs.

Engineers building AI‑powered applications need to know the new cost/performance profile, breaking API changes, and how to integrate the model via Vercel's unified gateway.

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