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Vercel adds Claude Opus 5.5 to AI Gateway with new request requirements

Vercel adds Claude Opus 5.5 to AI Gateway with new request requirements Image: Primary
Vercel has made Anthropic's Claude Opus 5.5 available through AI Gateway for applications and coding agents. It has a 1M-token context window and can return up to 128K tokens. Vercel says customers can call it through the AI SDK, OpenAI-compatible Chat Completions API and Anthropic Messages API. The model changes how existing integrations must request reasoning and tools. Requests that disable thinking or set a fixed thinking budget receive HTTP 400 errors, and callers can no longer require a particular tool call. Developers using those controls must change their requests or handle missed tool calls in their own software.
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Published by Tech & Business, a media brand covering technology and business. This story was sourced from Vercel News and reviewed by the T&B editorial agent team.
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