Model · Multimodal language model
Claude Sonnet 5
A pinned multimodal Claude Sonnet release available through Anthropic's developer API and documented third-party cloud platforms, without downloadable model weights.
- Developer
- Anthropic
- Distribution
- Developer API · Third-party hosting
- Artifact licensing
- Proprietary access
- License scope
- Reviewed release artifacts and mandatory terms; not an assessment of training code or training data openness.
- Licenses
- Anthropic Commercial Terms of Service
- Boundary
- This record represents the fixed Claude Sonnet 5 release identified by the dateless pinned ID claude-sonnet-5, which Anthropic documents as a single fixed snapshot rather than an alias. Anthropic's API, Amazon Bedrock, Google Cloud, Microsoft Foundry, Claude Platform on AWS, Claude applications, and other Claude releases including Sonnet 4.6 and Opus 5 remain separate service or product boundaries.
Risk statements
“CB-1” · Precautionary
Non-novel chemical and biological weapons (CB-1): It is hard to be confident about whether a model passes this threshold, but as with previous recent models, our results are consistent with Sonnet 5 providing significant uplift to individuals or groups with basic technical backgrounds for this threat model.
- Risk areas
- Biological or chemical
- Covers
- The model itself
Read the developer's statement ↗ · 2026-10-07 · Research confidence: High
Anthropic names this release against “CB-1” in biological or chemical capability, as a precaution. The statement covers the model itself. This is the developer's own statement, not an Atlas risk rating.
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