Claude Fable 5.1 API
LLMClaude Fable 5.1 keeps Fable 5's 1M context and adaptive thinking while lowering the listed cache-read rate to $0.25 per million tokens.
- Input · USD / 1M tokens$2.8 USDOfficial price
$10 USD - Output · USD / 1M tokens$14 USDOfficial price
$50 USD - Savings72%
- Context1M
- Last verified2026-09-18
- 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 Fable 5.1 keeps Fable 5's 1M context and adaptive thinking while lowering the listed cache-read rate to $0.25 per million tokens.
Choose Fable 5.1 for long-running, tool-heavy agent work that reuses a large context prefix and needs the latest Fable route.
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-fable-5-1",
"messages": [{"role": "user", "content": "Explain this codebase"}],
"stream": true
}'04
Compatible coding tools
More Anthropic models
Frequently asked questions
How much does Claude Fable 5.1 cost on OmniaKey?
OmniaKey charges $2.8 USD per 1M input tokens and $14 USD per 1M output tokens, in USD. Official prices are $10 USD and $50 USD; you save 72%.
What is the context window for Claude Fable 5.1?
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 Fable 5.1?
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.