Anthropic

Anthropic: Claude Fable 5.1

anthropic/claude-fable-5.1
Context

1M

Input

text, file, image

Output

text

Tool calling

Supported

About this model

Claude Fable 5.1 is Anthropic's frontier intelligence model designed for demanding reasoning, long-horizon agentic work, advanced software engineering, multistep research, and complex enterprise workflows. It is built for tasks that can span hours and multiple applications, with strong planning, tool orchestration, failure recovery, coding, document understanding, and vision capabilities. The model supports a 1M-token context window, adaptive reasoning that is always enabled, and up to 128K output tokens.

Input modalities

text

Accepted as model input

file

Accepted as model input

image

Accepted as model input

Providers

Available routing options for this model through OneInfer.

Available

Input tokens

$10.000 / 1M tokens

Output tokens

$50.000 / 1M tokens

Routing

OneInfer optimized

Pricing

Current OneInfer pricing for this model.

UsagePrice
Input tokens$10.000 / 1M tokens
Output tokens$50.000 / 1M tokens
Cached input tokens$0.250 / 1M tokens

Performance

Published evaluation results associated with this model.

Agentic

Terminal-Bench-Science 0.152.6
OSWorld 2.0 Partial77.9
OSWorld 2.0 Strict41.7
AutomationBench31.4

Coding

Terminal-Bench 4.055.8
CursorBench 3.2.073.4

Knowledge

GDPval-AA v21853

Reasoning

Humanity's Last Exam w/o Tools60.9
Humanity's Last Exam w/ Tools65

API example

Refer Documentation
  1. 1

    Generate your access token

    Use your API key to generate the JWT access token required by the Models API.

  2. 2

    Add the JWT token

    Copy the generated JWT token and replace JWT_TOKEN in the example below.

  3. 3

    Check your credits

    If your balance is too low, before calling the model.

  4. 4

    Run the API example

    Choose your preferred language, copy the example, and send your first model request.

    curl https://api.oneinfer.ai/v1/ula/chat/completions \
      -H "Authorization: Bearer $JWT_TOKEN" \
      -H "Content-Type: application/json" \
      -d '{
        "model": "anthropic/claude-fable-5.1",
        "messages": [
          { "role": "user", "content": "Hello!" }
        ]
      }'