Severity: Medium
Published: 27 days agoMar 30, 2026
Signal: 46

Claude Sonnet 4.6 generally available

We're retiring the 1M token context window beta for Claude Sonnet 4.5 and Claude Sonnet 4 on April 30, 2026 . After that date, the context-1m-2025-08-07 beta header will have no effect on these models, and requests that exceed the standard…

Official source entry

From Platform Release Notes. The simplified record can be checked against the original wording.

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Why it matters

Anthropic updated platform release notes semantics for llms and agents. Review the official entry during the next release review.

Who should care

backend
ai

Affected stack

llms
agents
ci-cd