Claude Opus 4.5
Direct predecessor to Opus 4.6. Strong choice when you need Claude 4 behaviour without changing existing prompts and evals tuned to the 4.5 generation.
Claude Opus 4.5 is a frontier AI model from Anthropic. It costs $15.000 per million input tokens and $75.000 per million output tokens (blended $33.000/M), with a 200,000-token context window.
- 1M-token context
- Stable for production pipelines
- Strong agentic coding
- Tool use & function calling
- Coding agents already tuned for 4.5
- Long-document analysis
- Stable production traffic
Benchmarks
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See all 18 →Frequently asked questions
How much does Claude Opus 4.5 cost?
Claude Opus 4.5 costs $15.000 per million input tokens and $75.000 per million output tokens, for a blended reference rate of $33.000 per million tokens.
What is Claude Opus 4.5's context window?
Claude Opus 4.5 supports up to 200,000 tokens of context in a single request.
What is Claude Opus 4.5 best for?
Claude Opus 4.5 is well suited to 1M-token context, Stable for production pipelines and Strong agentic coding.
Who makes Claude Opus 4.5?
Claude Opus 4.5 is developed and served by Anthropic. It was released in Sep 2025.