Claude Fable 5.1
Claude Fable 5.1 is a language model from Anthropic. It is currently free at 1 provider with up to 1M tokens of context. The model understands images, is suited to coding, supports tool calling.
- Developer
- Anthropic
- Context
- 1M tokens
- Type
- Text
- License
- Proprietary
- Free since
- October 13, 2026
Where to use Claude Fable 5.1 for free
Each row is a separate free endpoint with its own limits.
Quick start
curl https://api.unorouter.com/v1/chat/completions \
-H "Authorization: Bearer $UNOROUTER_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "claude-fable-5.1:free",
"messages": [{"role": "user", "content": "Hello!"}]
}'from openai import OpenAI
client = OpenAI(
base_url="https://api.unorouter.com/v1",
api_key="YOUR_UNOROUTER_API_KEY",
)
reply = client.chat.completions.create(
model="claude-fable-5.1:free",
messages=[{"role": "user", "content": "Hello!"}],
)
print(reply.choices[0].message.content)import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://api.unorouter.com/v1",
apiKey: process.env.UNOROUTER_API_KEY,
});
const reply = await client.chat.completions.create({
model: "claude-fable-5.1:free",
messages: [{ role: "user", content: "Hello!" }],
});
console.log(reply.choices[0].message.content);Example for UnoRouter. Any OpenAI-compatible client works: Cursor, Cline, OpenCode, Open WebUI.
Benchmarks
Source: Artificial Analysis · Claude Fable 5.1 (Max, Default Fallback)
Similar free models
FAQ
Is Claude Fable 5.1 free?
Yes. As of October 13, 2026, Claude Fable 5.1 is free at UnoRouter. Each provider has its own limits — see the table above.
What is the context window of Claude Fable 5.1?
The largest context among free routes is 1,000,000 tokens. Some providers cap it lower.
How do I call Claude Fable 5.1 via API?
Use any OpenAI-compatible client with base URL https://api.unorouter.com/v1, model ID claude-fable-5.1:free, and a UnoRouter key.
How good is Claude Fable 5.1?
Artificial Analysis Intelligence Index: 53.4, GPQA Diamond: 94%. For comparison, the strongest free model in the catalog right now is Claude Opus 5.5.
Is Claude Fable 5.1 open-weight?
No, it is proprietary: access is only through provider APIs.