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Anthropic · First-party API · LLM

claude-sonnet-5-5

Release announcedReleased on Sep 28, 2026
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Notice

Release announced

Released on Sep 28, 2026

Anthropic announced this model on 2026-09-28.

Hosting route
First-party API
Affected scope
Not stated in the notice
Announced
Sep 28, 2026
First seen by ModelClock
Oct 3, 2026

What the provider published

platform.claude.com ↗
  • We've launched Claude Sonnet 5.5 (claude-sonnet-5-5).

Read from the provider's text; the quote is the provider's exact lines.

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Same model elsewhere

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