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models / Anthropic / Claude Fable 5.1

Claude Fable 5.1

textanthropic/claude-fable-5.1

Claude Fable 5.1 is Anthropic's next model in the Fable family, with improvements in agentic coding, long-running agentic workflows, knowledge work, front-end and visual code generation, and finance and analysis tasks. It supports adaptive thinking and a 1M token context window.

$50.00list priceper 1M output tokens
pricing
unitlist price
per 1M cache write tokens$12.50
per 1M cached input tokens$0.25
per 1M input tokens$10.00
per 1M output tokens$50.00

Everyone pays the list price. Reaching Elite (hold or stake 1,337 $XAVA, or hold 1,337,000 $XINF) unlocks the Elite price and a bigger buyback of your token. How it works

openai sdk (python)
from openai import OpenAI

client = OpenAI(
    base_url="https://zinf.ai/v1",
    api_key="xk_live_...",  # your Xava Inference key
)

r = client.chat.completions.create(
    model="anthropic/claude-fable-5.1",
    messages=[{"role": "user", "content": "Hello!"}],
)
print(r.choices[0].message.content)
curl
curl https://zinf.ai/v1/chat/completions \
  -H "Authorization: Bearer $XINF_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"anthropic/claude-fable-5.1","messages":[{"role":"user","content":"Hello!"}]}'
limits
providerAnthropic
typetext
context window1,000,000 tokens
max output—
prompt storagenone
provider retentionthe model provider's policy
livesoon
requests 24h—
p50 latency—
uptime 7d—