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Claude Fable 5.1
anthropic/claude-fable-5.1
Anthropic's most capable widely released model, for the most demanding reasoning and long-horizon agentic work.
Modalities
text, image → text
Input / output
$10 / $50 per 1M
Context
1M · 128K out
Released
2026-09-01
Providers
Endpoints that serve this model. Requests fail over between them in priority order.
| Provider | Upstream model | Input /M | Output /M | Cached /M | Access | Price verified |
|---|---|---|---|---|---|---|
| Anthropic | claude-fable-5-1 | $10 | $50 | $0.25 | BYOK only | 2026-10-06 |
Performance (last 7 days)
Measured from requests served through this RouteHaven deployment.
Not enough traffic yet to report latency and success rate (0 requests in the last 7 days; at least 20 needed).
Cost estimate
Based on the provider list price above.
Provider list cost$4,500.00
Starter: 5.0% BYOK fee after $1,000 free$175.00
Business: 3.0% BYOK fee after $10,000 free$0.00
Enterprise: 1.0% BYOK fee after $50,000 free$0.00
With BYOK, the provider bills you the list cost directly; RouteHaven charges only the platform fee from your balance. Assumes this model is your only BYOK usage this month.
API
curl https://routehaven.ai/api/v1/chat/completions \
-H "Authorization: Bearer $ROUTEHAVEN_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "anthropic/claude-fable-5.1",
"messages": [{"role": "user", "content": "What is the meaning of life?"}]
}'streamingtoolstool_choicemax_tokensstopresponse_formatreasoning_effort