Updated Sep 2, 2026

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Updated Sep 2, 2026

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Claude Fable 5.1

Claude Fable 5.1 is a direct update to Fable 5, with its largest gains in agent coding, long-running workflows and knowledge work. Anthropic calls out long refactors, front-end generation, finance and analysis, with shorter plans and summaries than Fable 5.

Provider: Anthropic
Released: 2026-09-01
Size: XLARGE
Free API (OpenRouter): No
Per 1M tokens: $10 in · $50 out
Rival’s tab: $7.97; 10/10 receipts survived

Free API availability

No free endpoint for Claude Fable 5.1 was found in Rival’s OpenRouter listings. Other providers or chat apps may have separate free offers.

Provider data: 9 Sep 2026OpenRouter usage limits

View API options

Get API accessProvider and language code samples

4 hostsInOutContextUptime

Amazon Bedrock$10.00 in$50.00 out1M—Anthropic$10.00 in$50.00 out1M99.9% up Azure AI Foundry$10.00 in$50.00 out1M99.8% up Google Vertex AI$10.00 in$50.00 out1M99.5% up

Per million tokens. Prices and uptime via OpenRouter, checked 9 Sep 2026.

Provider

fromimport openai  OpenAI

client = OpenAI(
"https://openrouter.ai/api/v1"    base_url=,
"$OPENROUTER_API_KEY"    api_key=,
)

response = client.chat.completions.create(
"anthropic/claude-fable-5.1"    model=,
"role""user""content""Hello!"    messages=[{: , : }],
)
print(response.choices[0].message.content)

Set OPENROUTER_API_KEY with your OpenRouter API key from openrouter.ai/keys.

Model Responses

10 outputs · $7.97 tracked across 10 receipts

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