Claude Fable 5.1
A Claude model Anthropic lists as its most capable for long, careful work.
Anthropic, reasoning. Checked 30 October 2026.
Where to use it through an API
Anthropicclaude-fable-5-1
The maker publishes its own benchmarks and limits on its model page.
How it compares
The models just above and below it on the Artificial Analysis Intelligence Index.
| Model | Index | Context | Speed |
|---|---|---|---|
| GPT-6 Astra | 57 | 1M | 78/s |
| GPT-6.1 Sol | 55 | 1M | 79/s |
| Claude Sonnet 5.5 | 54 | 1M | 137/s |
| Claude Fable 5.1 | 50 | 1M | 64/s |
| Grok 4.7 | 35 | 500K | 94/s |
| DeepSeek V4.1 Flash | 32 | 1M | 179/s |
| GLM-5.3 | 32 | 1M | 72/s |
Use Claude Fable 5.1 with every other AI at once
Put Claude Fable 5.1 in one panel and ChatGPT, Claude, Gemini or any of 300+ models in the others. One message goes to all of them, answers arrive side by side, and test mode times them and hides the names so you judge fairly. Free during the beta with your own keys.
Questions
Is there a free Claude Fable 5.1 API?
Not that we found. Claude Fable 5.1 is paid per token through Anthropic.
What is the Claude Fable 5.1 model id?
Anthropic: claude-fable-5-1.
How does Claude Fable 5.1 score?
50 on the Artificial Analysis Intelligence Index at its xhigh setting, checked 30 October 2026.
Can I use Claude Fable 5.1 with ChatGPT, Claude and Gemini at the same time?
Yes. MultiScreenAI puts Claude Fable 5.1 in one panel and other models in the others, sends one message to all of them and shows the answers side by side.