Claude Opus 4.5
Claude Opus 4.5 is an active earlier Opus model with manual extended thinking. Its dated API snapshot remains distinct from the later adaptive-thinking releases.
Preserve the reasoning budget when migrating
Opus 4.5 uses the earlier extended-thinking interface. Its 200,000-token context and 64,000-token output ceiling are lower than the limits documented for Opus 4.6. The snapshot identifier contains 1 November, while the actual release date is 24 November 2025.Claude Opus 4.5 model reference
Specifications & access
| Detail | Value and conditions |
|---|---|
| Launch date | |
| Access | API |
| Model identifiers | claude-opus-4-5-20251101claude-opus-4-5 |
| Context window | 200,000 tokens Direct Claude API context limit Claude Opus 4.5 model reference |
| Maximum output | 64,000 tokens Synchronous Messages API maximum Claude Opus 4.5 model reference |
| Input price | 5 USD per million tokens Standard direct API input; cache, batch and tool charges are separate Claude Opus 4.5 model reference |
| Output price | 25 USD per million tokens Standard direct API output Claude Opus 4.5 model reference |
| Input and output | Text and images in; text outClaude Opus 4.5 model reference |
| Reasoning control | Manual extended thinking; default effort is high.Claude Opus 4.5 model reference |
| Reliable knowledge cutoff | May 2025Claude Opus 4.5 model reference |
Related models
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Anthropic · Claude Opus
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Launch date API - Claude Opus 4.6
Anthropic · Claude Opus
Claude Opus 4.6 expanded the Opus context window and introduced adaptive reasoning in this release line.
Launch date API