Anthropic ships 1M-token context (beta) for Claude Sonnet 4
MEDIUM IMPACT
update
Developers can now work with up to 1M tokens in Sonnet 4—ideal for large codebases, long PDFs, and multi-file RAG.
What's New
Anthropic launched beta support for a 1,000,000-token context window in Claude Sonnet 4 on its API and Amazon Bedrock.
Key Highlights:
- 1M-token context available in beta on API & Bedrock.
- New capacity unlocks long-document and large-repo use cases.
- API behavior note: some spikes now return HTTP 429 rate_limit_error.
We’ll watch for GA timing, pricing details, and Vertex AI availability.
About Claude
Anthropic's AI assistant focused on safety, accuracy, and helpfulness for analysis, writing, coding, and complex reasoning tasks.