Claude Fable 5.1
anthropic/claude-fable-5.1
Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work.
Key facts
- Input price
- $10.00 / 1M tokens
- Output price
- $50.00 / 1M tokens
- Context window
- 1M tokens
- Max output
- 128K tokens
- Accepts
- Text, Images, Files
- Returns
- Text
Example: 1,000 requests with 1,000 input and 500 output tokens each would cost about $35.00 (1M input tokens × $10.00 + 0.5M output tokens × $50.00). Estimate your own usage.
Prices are the provider’s own per-token rates with zero markup, from our price list as of Oct 18, 2026. If a call has extra provider charges (images, audio, web search, cached prompts), you pay the reported cost.
Call it from your code
curl https://api.tokenctr.com/v1/chat/completions \
-H "Authorization: Bearer $TOKENCENTER_API_KEY" \
-H "Content-Type: application/json" \
-d '{"model": "anthropic/claude-fable-5.1", "messages": [{"role": "user", "content": "Hello!"}]}'Works with any OpenAI-compatible SDK: set the base URL to https://api.tokenctr.com/v1. Quickstart
Benchmarks
Artificial Analysis
- Intelligence index
- 53.4
- Coding index
- 81.6
- Agentic index
- 57.9
Design Arena
| Category | Rank | Elo | Win rate |
|---|---|---|---|
| Agents: Full-stack | 1 | 1326 | 57.2% |
| Agents: Godot game dev | 1 | 1327 | 60.7% |
| Agents: Slides (python-pptx) | 1 | 1328 | 62.6% |
| Agents: Web apps | 1 | 1311 | 56.1% |
| Agents: Mobile apps | 3 | 1265 | 56.3% |
| Models: ASCII art | 3 | 1325 | 65% |
| Models: Game dev | 3 | 1384 | 65.6% |
| Models: Data visualization | 5 | 1346 | 61.8% |
| Models: SVG | 5 | 1301 | 56.4% |
| Models: 3D | 6 | 1393 | 67.7% |
| Models: Code | 7 | 1338 | 59.3% |
| Models: UI components | 9 | 1338 | 59.6% |
| Models: Websites | 9 | 1314 | 56.3% |
Source: Artificial Analysis indexes and Design Arena results as published in OpenRouter’s model data, fetched Oct 15, 2026. Higher is better. Not measured by TokenCenter. See all rankings.