Tasks and inputs
Claude Fable 5.1 is listed for Image-text-to-text, Text generation. It accepts text, image and produces text. Use the publisher’s input format and preprocessing for your chosen deployment.
SyncDev model directory · Profile updated Oct 13, 2026
Claude Fable 5.1 is an Anthropic language model that accepts text and images and returns text.
The specification score summarizes recorded features and limits. It is not a benchmark result.
Recorded modality support shows what this model can accept and produce. An undocumented modality is shown as unknown rather than assumed to be unsupported.
Accepts
Produces
Claude Fable 5.1 is an Anthropic language model that accepts text and images and returns text.
Fable is intended for substantial, extended tasks. Evaluate it where several reasoning steps and tool interactions contribute to one finished result. Its token rates are higher than Opus or Sonnet, so reserve judgment until you have measured whether it reduces retries or unfinished work.
Use claude-fable-5-1 on the Claude API. Adaptive thinking is always enabled, with high as the documented default effort. A wrapper that assumes thinking can be disabled needs to be reviewed before migration.
The standard documented limits are a one-million-token context window and 128,000 output tokens. Base Claude API rates are $10 input and $50 output per million tokens. Cache reads, cache writes, batch processing and a third-party host have separate pricing considerations.
Keep the effort setting, tool definitions and input material consistent. For document work, verify that the answer preserves important facts and identifies missing evidence. For coding, inspect the diff and run the test suite; do not turn a confident narrative into a passing score.
Explore the Anthropic catalog, or use the comparison tool to inspect a second candidate's interface and recorded prices. Specifications and access were checked against publisher documentation on the publisher’s announced release.
Compare the model on the work you need to complete.
Claude Fable 5.1 is listed for Image-text-to-text, Text generation. It accepts text, image and produces text. Use the publisher’s input format and preprocessing for your chosen deployment.
Documented limits: 1M context and 128K maximum output. The listed route charges $10.00 input and $50.00 output per million tokens. Measure a completed task using the prompts, documents and tools your application will use. Include reasoning and retries in the result.
Use the model identifier and account requirements for the selected API route. Confirm its request limits and output format with one complete task before connecting a larger workflow.
These records share a directory category. Check the source card, output type and deployment requirements before treating a model as a replacement.
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