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Claude Sonnet 4 now supports 1M token context in Vercel AI Gateway

1M tokens. Claude Sonnet 4 now processes entire codebases in a single API call—and Vercel just made it frictionless.

Reporting by Vercel Blog 1 min brief
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The KeyNews take

Why it matters

Vercel's AI Gateway democratizes access to Claude's expanded context window, removing provider friction and enabling developers to build with enterprise-scale document/code processing without managing multiple API keys or provider accounts.

The key facts

7 to know

  1. Claude Sonnet 4 context window expanded to 1M tokens

  2. Supports ~75,000+ lines of code in single input

  3. Available via Vercel AI Gateway with unified API

  4. Single API key required (no multi-provider account management)

  5. Built-in observability, BYOK support, intelligent provider routing

  6. AI Gateway leverages Anthropic and Bedrock backends

  7. Integrated with AI SDK v5

Go to the source

Vercel Blogvercel.com

Publisher excerpt: You can now leverage with Vercel's with no other provider accounts required. This release from Anthropic enables significantly larger inputs such as full codebases (~75,000+ lines) or large document sets. Claude Sonnet 4's updated 1 million-token context windowAI Gateway AI Gateway lets you call…
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