Claude Fable 5.1 API

US Anthropic | released 2026-10

Claude Fable 5.1 improves on Claude Fable 5 across the board, with particular gains in agentic coding, long-running agent workflows and knowledge work. A strong pick when you need dependable multi-hour autonomy on complex tasks through the MeshTok unified API.

ReasoningCodeTool UseFlagship

Pricing (official list, per 1M tokens)

Input

$10.00/M

Output

$50.00/M

Specifications

Context window1000K tokens Input modalitiesText StreamingYes APIOpenAI-compatible

How to use Claude Fable 5.1

Drop-in OpenAI replacement. Change only the base_url and model.

# Python -pip install openai
from openai import OpenAI

client = OpenAI(
    base_url="https://meshtok.com/v1",
    api_key="sk-your-MeshTok-key",
)

resp = client.chat.completions.create(
    model="anthropic/claude-fable-5.1",
    messages=[{"role":"user","content":"Hello!"}],
)
print(resp.choices[0].message.content)

# cURL
curl https://meshtok.com/v1/chat/completions \
  -H "Authorization: Bearer sk-your-MeshTok-key" \
  -H "Content-Type: application/json" \
  -d '{"model":"anthropic/claude-fable-5.1","messages":[{"role":"user","content":"Hello!"}]}'