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By using Claude Fable 5.1, you consent to data retention for purposes of monitoring safe and compliant use of AI. Anthropic's data retention policy does not allow zero data retention. Learn more(opens in new tab)

Amazon Bedrock endpoint is BYOK-only while we work on enabling public access.

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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 code generation, and finance and analysis tasks in particular. It also tends to be more concise than Fable 5 in its plans and summaries. We recommend testing it as a direct upgrade wherever you use Fable 5 today, and alongside Opus 5 on reasoning-heavy tasks.

Modalities

In / Out Price

$10 / $50per 1M

Context

1M

Released

Sep 1, 2026

Compare
ProvidersPricingPerformanceUptimeAppsActivityFAQExplore

Providers

Different companies host the same model. OpenRouter routes your request to one of them based on the routing mode you pick — Balanced (price + speed), Nitro (fastest), or Exacto (highest tool-calling accuracy).

Pricing

The average price customers actually pay for this model, next to the prices providers post. Caching and discounts mean the price actually paid is often well below the listed one.

Performance

Throughput is how fast the model writes (tokens per second — higher is better). Latency is total round-trip time (lower is better). TTFT is time-to-first-token — how long before you see anything appear (lower is better).

Uptime

Uptime is the percentage of the past 3 days that at least one provider was responding to requests. Availability is the percentage of time that inference was successfully served. OpenRouter continuously monitors and uses the next-best provider when one returns an error.

Apps

Public apps that send the most traffic to this model. Good signal for what real production workloads look like — and a hint at which use cases this model is best suited for.

Activity

Token volume and request traffic to this model over time.

Quick Start

Drop-in code to call this model. OpenRouter's API is OpenAI-compatible — most SDKs work by just swapping the base URL. The only thing that changes between models is the model slug below.

Explore more models

AI Models with Vision: Multimodal LLMs for Image UnderstandingCollectionAI Model RankingsRanking
$10.00$50.00$0.254.62s53 tps
99.82%
$10.00$50.00$0.252.56s22 tps
--
$10.00$50.00$0.255.85s50 tps
99.74%
$10.00$50.00$0.25----
99.01%

Throughput

53tok/s

P50, best across providers

Latency

2.56s

P50, best provider

Uptime (3d)

100.00%

Availability (3d)

99.93%

Availability over the last 3 days

Last 72 hours
Availability 99.93%
3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability
99.94%
Without Routing
97.09%

When an error occurs in an upstream provider, we can recover by routing to another healthy provider, if your request filters allow it. You can access per-provider uptime data programmatically through the Endpoints API. Learn more about our load balancing and customization options.

1.
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Hermes Agent
Hermes Agent is an open-source, self-improving AI agent by Nous Research that runs persistently with memory across sessions, and builds reusable skills from experience. It comes with 40+ built-in tools, including web search, browser automation, and vision, plus scheduled automations and subagents.
880Mtokens
2.
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Descript
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3.
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Claude Code
Claude Code is Anthropic's agentic coding tool that reads your entire codebase, plans and executes changes across files, runs tests, and iterates on failures, all from natural language prompts.
370Mtokens
4.
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omp
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Frequently asked questions

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 code generation, and finance and analysis tasks in particular. It also tends to be more concise than Fable 5 in its plans and summaries.

Claude Fable 5.1 costs $10.00/M input tokens and $50.00/M output tokens, with separate rates for Cache Read at $0.25/M tokens, Cache Write at $12.50/M tokens and Cache Write (1h) at $20.00/M tokens.

Claude Fable 5.1 has a 1,000,000 token context window. It supports up to 128,000 completion tokens.

Yes. Claude Fable 5.1 accepts tools for function calling. It supports response_format for JSON output, without JSON-schema enforcement.

Claude Fable 5.1 accepts text, images and files such as PDFs as input and returns text.

Claude Fable 5.1 is served by 4 providers on OpenRouter: Google Vertex, Amazon Bedrock (BYOK Only), Anthropic and Azure. Requests are routed to the best available provider, with automatic failover to the others, and you can pin or exclude providers with provider routing.

Claude Fable 5.1 was released on September 1, 2026.