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Claude Opus 5.5

Current Opus: complex coding, agents and enterprise work at a lower price.

  • Image input
  • Reasoning
  • Coding
  • Tool calling
  • Structured output
  • Extended thinking
  • Streaming
Chat with Claude Opus 5.5All models

Specifications

ProviderAnthropic
API model IDclaude-opus-5-5
ReleasedSeptember 2026
Context window1,000,000 tokens
Max output128,000 tokens
Reasoning modelYes
Price per 1M tokens (input / output)$4 / $20

Specs as published by Anthropic. Prices are standard list prices before caching or batch discounts.

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FAQ

What is the context window of Claude Opus 5.5?
Claude Opus 5.5 accepts up to 1,000,000 tokens of context and can return up to 128,000 output tokens per reply.
When was Claude Opus 5.5 released?
Anthropic released Claude Opus 5.5 in September 2026.
How do I use Claude Opus 5.5?
Add your Anthropic API key in DapperGPT, pick Claude Opus 5.5 in the model picker, and start chatting. You pay Anthropic directly for usage.