What the evidence says
These facts come from the reviewed Epoch AI catalog artifact and its linked primary record. They describe the model. They do not rank it.
- Developer [1]
- Anthropic
- Released [1]
- October 15, 2025
- Domains [1]
- Language
- Tasks [1]
- Chat · Code generation · Language modeling/generation · Question answering
- Access [1]
- API access
- Weights [1]
- Closed
Where it may fit
These are evidence-bounded screening suggestions, not performance claims or purchase recommendations.
Chat-centered workflows
Consider it when chat is the explicit documented task and a hosted API deployment is acceptable.
Evidence fields: tasks, access [1]
Code-generation screening
Consider it when assembling an API-only code-generation shortlist; the record explicitly lists code generation.
Evidence fields: tasks, access, openWeights [1]
Limitations
The record does not report coding accuracy, price, context window, latency, or safety evaluations, and no exact-match Arena rating exists for it. Task labels indicate intended scope, not measured performance.
Current standing
According to the LMArena snapshot published July 12, 2026, no exact match for this catalog record appears in the style-controlled text category, so this page reports no current rating for Claude Haiku 4.5.