Claude Sonnet 5.5 API
Use 1M context with one OmniaKey API key.
- Model ID
- claude-sonnet-5-5
- Context
- 1M
- Provider
- Anthropic
- Input · USD / 1M tokens
- $0.56 USD
- Official price $2 USD
- Output · USD / 1M tokens
- $2.8 USD
- Official price $10 USD
- Savings
- 72%
- Last verified
- 2026-09-28
01
Where it fits
Choose Sonnet 5.5 for daily agent work that needs long context and tools, then replay your existing Sonnet 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-sonnet-5-5",
"messages": [{"role": "user", "content": "Explain this codebase"}],
"stream": true
}'04
Compatible coding tools
More Anthropic models
Frequently asked questions
How much does Claude Sonnet 5.5 cost on OmniaKey?
OmniaKey charges $0.56 USD per 1M input tokens and $2.8 USD per 1M output tokens, in USD. Official prices are $2 USD and $10 USD; you save 72%.
What is the context window for Claude Sonnet 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 Sonnet 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.