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Claude Sonnet 4.5

Model
AnthropicFamily Claude 4legacy

A Claude model optimized for coding, computer use, complex agents, reasoning, and mathematics.

Released
Sep 29, 2025
Context window
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Modality
textimage
Open source
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API available
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Releases
1

Releases

1
Sep 29, 2025Claude Sonnet 4.5 releasedClaude Sonnet 4.5

Anthropic released Claude Sonnet 4.5 with major gains in coding, computer use, agents, reasoning, and mathematics.

Anthropic Model releaseAnthropicClaude Sonnet 4.5