Claude Fable 5.1 API
Anthropic's newest flagship: the Fable line's strongest coding and agentic model, with a 1M-token context for whole-repository and multi-document work.
Searching for the Claude Fable API? Claude Fable 5.1 is the current Claude Fable release — same endpoint and key across every version, so code written for the Claude Fable API works unchanged when new versions ship.
Pricing
| Official | AI Prime Tech | You save | |
|---|---|---|---|
| Input (per 1M tokens) | $10 | $1.3 | 87% OFF |
| Output (per 1M tokens) | $50 | $6.5 |
Pay-as-you-go, no subscription. Prompt caching and batch discounts apply on top where supported.
Best for
- Hardest coding and agent tasks
- Whole-repository analysis at 1M context
- Long multi-document reasoning
- Latest-generation capability
Specifications
| Release | 2026 |
| Context window | 1M tokens |
| Vision | Yes |
| Tool use | Yes |
| Model ID | claude-fable-5-1 |
Quick start
Use your existing SDK — just point it at our gateway and use model ID claude-fable-5-1:
export ANTHROPIC_BASE_URL=https://aiprimetech.io
export ANTHROPIC_AUTH_TOKEN=sk-your-key-hereWorks with Claude Code, Cursor, Cline, Aider, and the official Anthropic / OpenAI SDKs. See the 60-second setup guide.
Instant API key, pay-as-you-go, crypto accepted. 87% below official pricing.
Get Your API Key →All models: Claude Opus 5 · Claude Sonnet 5 · Claude Fable 5 · Claude Opus 4.8 · Claude Sonnet 4.6 · Claude Haiku 4.5 · Claude 1M Context · GPT-5.5 · GPT-5 · Gemini 3 Pro · Gemini 3 Flash · MiniMax M3