Claude Fable 5.1

anthropic/claude-fable-5.1

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...

InputFileImageText
OutputText
Input / Outputclub$10.6 / $53per 1M tokens · USD
Context window1Mtoken
Maximum output128Ktoken

Pricing

Current model usage rates. Choose your plan to see its published prices.

Pricing
UsagePricing
InputUS$10.6/ 1M token
Cache readUS$0.265/ 1M token
Cache writeUS$13.25/ 1M token
Cache write · 1 hUS$21.2/ 1M token
OutputUS$53/ 1M token

Membership and model usage are billed separately. Compare plans

Capabilities

Input
FileImageText
Output
Text
Context window
1,000,000 token
Maximum output
128,000 token
Reasoning
max · xhigh · high · medium · low

Providers

Model supply available through Vecbase.

Via OpenRouter

Access is subject to your account’s permissions and model availability.

Frequently asked questions

What is Claude Fable 5.1, and who develops it?

Claude Fable 5.1 is a model from Anthropic. Its model ID on Vecbase is anthropic/claude-fable-5.1. 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...

How much does Claude Fable 5.1 cost on Vecbase?

For Claude Fable 5.1, the Club plan lists USD 10.6 per 1 million input tokens and USD 53 per 1 million output tokens, as of 10/22/2026, 9:30:02 PM UTC. See the pricing table for cache rates, input-length tiers and other usage types. Membership fees are separate.

How many tokens fit in Claude Fable 5.1’s context window?

Claude Fable 5.1 has a context window of 1,000,000 tokens. Input and output must fit within the limits of the API you use.

What is the maximum output length for Claude Fable 5.1?

Claude Fable 5.1 can generate up to 128,000 tokens per response. Your API or request settings may set a lower limit.

Can Claude Fable 5.1 call tools in an agent workflow?

Yes. Claude Fable 5.1 supports tool calling. Your application provides the tool definitions and runs the tools the model requests.

Does Claude Fable 5.1 support structured outputs?

Yes. Claude Fable 5.1 supports structured output. Set the required format in your API request and check the returned data before using it.

Which input and output formats does Claude Fable 5.1 support?

Claude Fable 5.1 accepts File, Image, and Text and produces Text.

Which providers make Claude Fable 5.1 available through Vecbase?

Vecbase offers Claude Fable 5.1 through OpenRouter. Availability may vary by provider.

Which model ID should an agent use to request Claude Fable 5.1?

Use anthropic/claude-fable-5.1 as the model identifier for Claude Fable 5.1. See Vecbase’s API documentation for authentication, required inputs and supported request formats.

Which reasoning settings are listed for Claude Fable 5.1?

Claude Fable 5.1 supports these reasoning levels: max, xhigh, high, medium, and low. Available options depend on your API.

What does an agent need to access Claude Fable 5.1 through Vecbase?

To use Claude Fable 5.1, you need an authenticated account with the required permissions, sufficient balance and the relevant capability enabled. See the documentation for setup.

Is a release date available for Claude Fable 5.1?

We do not yet have a confirmed release date for Claude Fable 5.1.

Which models can I compare with Claude Fable 5.1 on Vecbase?

You can compare Claude Fable 5.1 with Claude Haiku Latest (anthropic/claude-haiku-latest), Claude Sonnet Latest (anthropic/claude-sonnet-latest), and Claude Opus Latest (anthropic/claude-opus-latest). Check their capabilities and prices to find the best fit for your task.