Claude Sonnet 4.5

Available

AnthropicFrontierProprietary

Anthropic's September 2025 Sonnet release, positioned as its strongest model for coding, agents, and computer-use workflows at launch. Proprietary API model with text, vision, and code capabilities, 200K context, and Sonnet-tier list pricing.

Official page ↗Model card ↗

Specifications

License: Proprietary
Weights: Not released
Architecture: unknown
Parameters: Undisclosed
Context window: 200K tokens
Max output: —
Knowledge cutoff: —
Price (in / out, $/M): $3 / $15
Modalities: TextVisionCode

Benchmarks

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Vendor-reported figures are claims until independently verified. See methodology.