Claude Fable 5.1
Claude Fable 5.1 is the current model in Anthropic's Fable family. It extends Claude Fable 5 with stronger long-running agentic coding, multistep research, and document, spreadsheet, and slide work. Anthropic recommends it for demanding reasoning and long-horizon agentic work, or when evals on Claude Opus 5 at higher effort still fall short.
The real Anthropic model
Same weights, same API, same answers. We change only how you pay for it: one key for every maker, one bill, no separate account to open. Every figure on this page comes from Anthropic’s own page — check it.
Maker's own pagePrice
input / output · per 1M tokensAnthropic
Official price
Context
1,000,000
up to 128,000 out
32,000 by default here
Modalities
Released
Sep 1, 2026
Knows up to Jun 2026
What it would cost you
1000 tokens is roughly 750 English words.
How it is served
Requests are retried automatically if a provider is unavailable.
Similar models
Models built for the same kind of work, at a similar price.
We do not mark up the price of tokens. It is the same price the maker charges.
Use it from your code
from openai import OpenAI
# Works with the official openai package (pip install openai)
client = OpenAI(
base_url="https://api.flintbeam.com/v1",
api_key="sk-live-your-api-key"
)
response = client.chat.completions.create(
model="anthropic/claude-fable-5-1",
messages=[
{"role": "system", "content": "You are an experienced software engineer."},
{"role": "user", "content": "Describe the architecture of a distributed cache."}
],
temperature=0.7,
max_tokens=1500
)
print(response.choices[0].message.content)