Sonnet 5.5

From its lab

Its lab hasn't written about it in the paper's sources.

In the API

• Claude API Release NotesMonday, September 28Claude Sonnet 5.5

Where it runs

• Vercelsince Sunday, September 27Claude Sonnet 5.5 now available on AI Gateway
• Netlifysince Sunday, September 27Claude Sonnet 5.5 now available in AI Gateway and Agent Runners
• What's New with AWSsince Monday, September 28Claude Sonnet 5.5 now available on AWS GovCloud (US)
• OpenRoutersince Monday, September 28New model: Anthropic: Claude Sonnet 5.5

Incidents

No status page has named it.

Deadlines

• Mon, Jul 21, 2025453 days agoNamed as the replacement for claude-3-sonnet-20240229, which shut down.Anthropic
• Tue, Oct 28, 2025354 days agoNamed as the replacement for claude-3-5-sonnet-20240620, which shut down.Anthropic
• Tue, Oct 28, 2025354 days agoNamed as the replacement for claude-3-5-sonnet-20241022, which shut down.Anthropic
• Thu, Feb 19, 2026240 days agoNamed as the replacement for claude-3-7-sonnet-20250219, which shut down.Anthropic
• Mon, Jun 15, 2026124 days agoNamed as the replacement for claude-sonnet-4-20250514, which shut down.Anthropic
• Mon, Nov 30, 2026in 44 daysNamed as the replacement for claude-sonnet-4-5-20250929, which shuts down.Anthropic