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ToolsThe story, in brief

Claude Sonnet 5.5 now available on AI Gateway

Claude Sonnet 5.5 ships to Vercel's AI Gateway. Multi-step coding, better documents, zero-data retention.

Reporting by Vercel Blog 2 min brief
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The KeyNews take

Why it matters

Anthropic's latest model improves on everyday coding and content work and is now available through a unified API gateway that tracks cost and routing — lowering friction for enterprises already standardizing on AI Gateway.

The key facts

14 to know

  1. Claude Sonnet 5.5 available on Vercel AI Gateway as anthropic/claude-sonnet-5.5

  2. Improvements: multi-step coding task execution with self-checking, more polished documents/slides/spreadsheets, better desktop app interaction and chart/technical drawing reading

  3. Zero Data Retention supported on AI Gateway

  4. Compatible with AI SDK, OpenAI-compatible Chat Completions API, Responses API, Anthropic Messages API, and coding agents

  5. Setup via npx vercel ai-gateway setup

  6. AI Gateway provides unified API for model calling, usage/cost tracking, routing, retries, and failover

  7. Published: September 28, 2026

  8. Claude Sonnet 5.5 available on Vercel AI Gateway with anthropic/claude-sonnet-5.5 identifier

  9. Improvements: multi-step coding tasks with work verification, polished document/slide output, desktop app use, chart and technical drawing reading

  10. Zero Data Retention support confirmed on AI Gateway

  11. Compatible with AI SDK, OpenAI-compatible Chat Completions API, Responses API, Anthropic Messages API, and connected coding agents

  12. Setup: npx vercel ai-gateway setup, select model in agent settings

  13. AI Gateway features: unified API, usage/cost tracking, routing, retries, failover

  14. API key options: AI Gateway key or bring-your-own provider key

The story so far

Earlier coverage of this storyline

  1. Claude Opus 5.5 now available on AI GatewayVercel Blog
  2. Claude Opus 5.5 is now available on AWSAWS Machine Learning Blog
  3. This story

Go to the source

Vercel Blogvercel.com

Publisher excerpt: from is now available on as .Claude Sonnet 5.5AnthropicAI Gatewayanthropic/claude-sonnet-5.5 Sonnet 5.5 improves on for well-scoped everyday work, from building features and fixing bugs to creating documents, slides, and spreadsheets.Claude Sonnet 5 On coding tasks, Sonnet 5.5 carries changes…
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