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Anthropic: Claude Fable 5.1

anthropic/claude-fable-5-1
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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: long code refactors, front-end and visual

Modalities
In / out per 1M$10 / $50
Context1M
ReleasedSep 1, 2026

Providers

4 providers serve this model upstream.

Providers serving this model
ProviderInput /MOutput /MCache read /MLatency P50Throughput P50Uptime
Azure$10$50$0.256.99s56 tps100%
Anthropic$10$50$0.253.69s65 tps100%
Google Vertexglobal$10$50$0.252.06s68 tps100%
Amazon Bedrock (BYOK Only)$10$50$0.25———

Market-wide measurements, refreshed every 15 minutes. They describe who serves Claude Fable 5.1 in general, not how ProjectCOZY routes your requests.

Pricing

List rates per 1M tokens — what Claude Fable 5.1 costs pay-as-you-go elsewhere, not what you pay here.

Input
$10
per 1M tokens
Output
$50
per 1M tokens
Cache read
$0.25
per 1M cached tokens
Included in every pass
Claude Fable 5.1 is included in every ProjectCOZY pass at no extra cost — one flat rate, no per-token metering. The rates above are there for comparison.

Performance

Time to first token and output speed across every provider, over the last 3 days.

0.0s5.0s10.0s15.0s20.0s
Oct 16, 12 AMOct 16, 8 AMOct 16, 4 PMOct 17, 12 AMOct 17, 8 AMOct 17, 4 PMOct 18, 12 AMOct 18, 8 AMOct 18, 4 PMOct 19, 12 AM
Google Vertex (global) Anthropic Azure Amazon Bedrock (BYOK Only)
0 tok/s50 tok/s100 tok/s150 tok/s200 tok/s
Oct 16, 12 AMOct 16, 8 AMOct 16, 4 PMOct 17, 12 AMOct 17, 8 AMOct 17, 4 PMOct 18, 12 AMOct 18, 8 AMOct 18, 4 PMOct 19, 12 AM
Google Vertex (global) Anthropic Amazon Bedrock (BYOK Only)

Uptime

100% of requests were served successfully over the last 3 days, across all providers.

Last 3 daysAvailability 99.94%
Oct 16, 9:00 AMNow
Availability over the last 24 hoursAvailability 99.95%
100% 98% 97% 95%
Oct 18, 9:00 AMNow

Apps

Tools that most often run Claude Fable 5.1, by tokens this week.

Claude CodeCli Agent · 65.6% of tokens613.1BHermes AgentPersonal Agent · 24.7% of tokens230.6BompCli Agent · 5.1% of tokens47.7BpiCli Agent · 2.9% of tokens27.5BClineIde Extension · 1.7% of tokens15.5B

Activity

1751.4B tokens processed market-wide in the last month.

050.0B100.0B150.0B200.0B
Sep 19Sep 24Sep 29Oct 4Oct 9Oct 14Oct 19
Tokens

FAQ

Which model id do I use for Claude Fable 5.1?
anthropic/claude-fable-5.1. Send it as the model field from any OpenAI-compatible client, against http://192.168.1.55/v1.
How much context does Claude Fable 5.1 hold?
1,000,000 tokens per request, of which up to 128,000 can be the response.
What can it accept and return?
Input: text, image, file. Output: text.
What does Claude Fable 5.1 cost on a pass?
Nothing beyond the pass itself. Pay-as-you-go elsewhere it lists at $10 per 1M input tokens and $50 per 1M output tokens.
Who built Claude Fable 5.1?
Anthropic, in the Claude family.

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