Claude Opus 5.5 API
NewLLMClaude Opus 5.5 is Anthropic's newest Opus route: the September 2026 rate card drops to $4 / $20 per million tokens while keeping 1M context, vision, tool use, and always-on adaptive thinking.
- Input · USD / 1M tokens$1.12 USDOfficial price
$4 USD - Output · USD / 1M tokens$5.6 USDOfficial price
$20 USD - Savings72%
- Context1M
- Last verified2026-09-23
- View tool pricing and billing rules
What are we making today?
Bring an idea, a question, or a first draft.
01
Where it fits
Claude Opus 5.5 is Anthropic's newest Opus route: the September 2026 rate card drops to $4 / $20 per million tokens while keeping 1M context, vision, tool use, and always-on adaptive thinking.
Choose Opus 5.5 for long codebase migrations and hard debugging, then replay your existing Opus 5 prompts before switching a working agent over.
02
Model capabilities
Vision
Accepts visual input alongside text for multimodal coding and analysis tasks.
Tool use
Can select and call tools in agent workflows that support structured tool use.
Adaptive thinking
Adjusts reasoning effort to the difficulty of the request.
03
OpenAI-compatible API
Keep your client and change the base URL, API key, and model ID.
curl https://api.omniakey.com/v1/chat/completions \
-H "Authorization: Bearer $OMNIAKEY_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "claude-opus-5-5",
"messages": [{"role": "user", "content": "Explain this codebase"}],
"stream": true
}'04
Compatible coding tools
More Anthropic models
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Read articleFrequently asked questions
How much does Claude Opus 5.5 cost on OmniaKey?
OmniaKey charges $1.12 USD per 1M input tokens and $5.6 USD per 1M output tokens, in USD. Official prices are $4 USD and $20 USD; you save 72%.
What is the context window for Claude Opus 5.5?
The listed context window is 1M. Actual usable limits can also depend on the client and upstream request format.
Which coding tools work with Claude Opus 5.5?
The current catalog lists compatibility with Claude Code, Cursor, Cline, Aider. Use the model ID shown on this page when the client supports model selection.