Name: Claude Sonnet 4.5
Brand: Anthropic

Where to run it

Other tracked companies’ own announcements naming this model — each is that platform’s claim, not the lab’s.

AmpCapability change· 29 Sep

Now Using Claude Sonnet 4.5

Amp has switched its primary model to Claude Sonnet 4.5, the latest release from Anthropic. The company reports improvements in coding tasks such as reduced sycophancy, higher success rates for file…

CognitionCapability change· 29 Sep

Rebuilding Devin for Claude Sonnet 4.5: Lessons and Challenges

Cognition rebuilt Devin for Claude Sonnet 4.5, resulting in a 2x faster and 12% better performance on Junior Developer Evals.

None of Anthropic’s posts in the archive name Claude Sonnet 4.5 yet.

Coverage

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