Model · Multimodal language model
Claude Opus 5
A pinned multimodal Claude Opus 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 Opus 5 release identified by the dateless pinned ID claude-opus-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 Opus 4.8 remain separate service or product boundaries.
Risk statements
“CB-1” · Precautionary
It is difficult to say with full confidence whether a model passes this threshold. However, Claude Opus 5 is broadly more capable than previous models like Sonnet 4.6 which we have conservatively treated as having CB-1 capabilities. As with earlier models we have conservatively treated as having CB-1 capabilities, we apply commensurate protections: real-time classifier guards, access controls for guard exemptions, a bug bounty program and threat intelligence, rapid-response options for jailbreaks, and security controls against model weight theft.
- Risk areas
- Biological or chemical
- Covers
- The model itself
Read the developer's statement ↗ · 2026-10-07 · Research confidence: Medium
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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