Claude Opus 5.5
Claude Opus 5.5 sits in the frontier tier, built for high-capability reasoning, tool use, and long-form output where capability outweighs cost. Available via Anthropic. 1,000,000-token context. Premium pricing.
Claude Opus 5.5 is a multimodal AI model from Anthropic. It costs $4.00 per million input tokens and $20.00 per million output tokens (blended $8.80/M), with a 1,000,000-token context window.
RatesUSD per million tokens. Blend is 70% input, 30% output, our calculation.
From OpenRouter's listing, read on 11 Nov 2026.
- Strong general reasoning
- Tool use & function calling
- Long-form writing
- Production-grade reliability
- Multimodal: handles images alongside text
- Production assistants
- Long-document analysis
- Multi-step agent workflows
- Engineering copilots
Benchmarks
More from Anthropic
See all 18 →Frequently asked questions
How much does Claude Opus 5.5 cost?
Claude Opus 5.5 costs $4.00 per million input tokens and $20.00 per million output tokens, for a blended reference rate of $8.80 per million tokens.
What is Claude Opus 5.5's context window?
Claude Opus 5.5 supports up to 1,000,000 tokens of context in a single request.
What is Claude Opus 5.5 best for?
Claude Opus 5.5 is well suited to Strong general reasoning, Tool use & function calling and Long-form writing.
Who makes Claude Opus 5.5?
Claude Opus 5.5 is developed and served by Anthropic.