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ToolsThe story, in brief

Claude Opus 5.5 now available on AI Gateway

Claude Opus 5.5 lands on AI Gateway with agentic coding as the flagship use case — better long-run supervision, faster inference option, and unified API for routing and cost control.

Reporting by Vercel Blog 2 min brief
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The KeyNews take

Why it matters

A capable model release positioned explicitly for agent workflows, but the story is the product integration (AI Gateway availability, API changes, agent tooling) rather than the model capability itself. Practitioners building agents on Claude need to know about the fast mode option, API breaking changes, and the removal of forced tool use.

The key facts

16 to know

  1. Claude Opus 5.5 available on Anthropic AI Gateway

  2. 1M-token context window, 128K token output

  3. June 2026 knowledge cutoff

  4. Two API breaking changes: adaptive thinking (no fixed budget), no forced tool use (use structured outputs instead)

  5. Fast mode option (anthropic/claude-opus-5.5-fast) for agent inference

  6. Regional inference and Zero Data Retention (opt-in)

  7. AI Gateway provides unified API, usage tracking, routing, failover, no platform fee on inference

  8. Integration with Vercel CLI and coding agents

  9. Improved long-run agent supervision and plain-language reporting of steps/findings

  10. 1M-token context window, 128K token output limit

  11. Step-change improvements in agentic coding and long-running agent tasks

  12. Two breaking API changes: adaptive thinking (no forced thinking budgets) and structured outputs (no forced tool calls)

  13. Regional inference and Zero Data Retention (ZDR) available as opt-in controls

  14. AI Gateway provides unified API with no markup and no platform inference fees, including BYOK requests

  15. Integration support for Vercel CLI and coding agents

  16. Fast mode available for inference speed optimization

Go to the source

Vercel Blogvercel.com

Publisher excerpt: from is now available on . It is a step-change improvement over , with its biggest gains in agentic coding, long-running agent tasks, and knowledge work.Claude Opus 5.5AnthropicAI GatewayOpus 5 Opus 5.5 is also a better collaborator over long runs. It reports back in plain language on what it did,…
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