Claude Opus 4.5
Released
Claude Opus 4.5 is an AI model released by Anthropic on Monday, Nov 24 2025, 40 days after Claude Haiku 4.5. Benchmark results (shown below) cover BullshitBench v2, SWE-Bench Verified, Humanity's Last Exam, GPQA Diamond, and OSWorld-Verified.
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API pricing
- InputWhat you pay for everything you send the model — your question, plus any documents or earlier conversation you include with it.
- $5.00
- Cached inputA reduced rate for text you send over and over. If every request starts with the same instructions or the same document, the provider keeps a copy ready and charges less to read it again.
- $0.50
- 5 min cache writeA one-off charge for storing text so later requests can reuse it at the cheaper cached rate. This option keeps it for five minutes.
- $6.25
- 1 hr cache writeA one-off charge for storing text so later requests can reuse it at the cheaper cached rate. This option keeps it for an hour, so it costs more than the five-minute one.
- $10.00
- OutputWhat you pay for the text the model writes back. It is normally the dearer half: producing an answer costs more than reading one.
- $25.00
Available from
| Amazon Bedrock | — | $5.00 | $25.00 | 200K |
|---|---|---|---|---|
| Azure | global | $5.00 | $25.00 | 200K |
| global | $5.00 | $25.00 | 200K | |
| Amazon Bedrock | eu-west-1 | $5.50 | $27.50 | 200K |
Benchmarks
Coding
Agentic & tool use
Reasoning & science
Robustness
Source: BenchLM, retrieved 31 August 2026. Every other score here is the figure the lab published at launch.
About
Claude Opus 4.5, released November 24, 2025, was the first model to break 80% on SWE-Bench Verified, scoring 80.9%, alongside 87.0% on GPQA Diamond. Anthropic paired the capability jump with a dramatic price cut for the Opus tier, making its flagship practical for everyday agentic coding rather than reserved for hard problems.
The release capped an unusually fast 2025 cadence for Anthropic — Sonnet 4.5 in September, Haiku 4.5 in October, Opus 4.5 in November — and closed the year with Claude on top of most published coding evaluations. The Opus line continued with Opus 4.6 in February 2026 and Opus 4.7 in April 2026.
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Frequently asked questions
Claude Opus 4.5 was released by Anthropic on Monday, Nov 24 2025.