Model · Multimodal language model
Claude Haiku 4.5
A dated, pinned multimodal Claude 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 Haiku 4.5 snapshot identified by claude-haiku-4-5-20251001, which the claude-haiku-4-5 alias resolves to. Anthropic's API, Amazon Bedrock, Google Cloud, Microsoft Foundry, Claude Platform on AWS, Claude applications, and any later Haiku release remain separate service or product boundaries.
Risk statements
“ASL-2” · Safeguard standard
Our safety testing also showed that Claude Haiku 4.5 poses only limited risks in terms of the production of chemical, biological, radiological, and nuclear (CBRN) weapons. For that reason, we’ve released it under the AI Safety Level 2 (ASL-2) standard—compared to the more restrictive ASL-3 for Sonnet 4.5 and Opus 4.1.
- Risk areas
- Biological or chemical
- Covers
- The model itself
Read the developer's statement ↗ · 2026-10-07 · Research confidence: High
Anthropic states that this release ships under the “ASL-2” safeguard standard for biological or chemical capability. The statement covers the model itself. This is the developer's own statement, not an Atlas risk rating.
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