Antimatter
Anthropic

Claude Fable 5.1 (batch)

anthropic/claude-fable-5.1:batch

$5.50 in · $27.50 out per 1M tokens1M contextSep 1, 2026

about 1.7¢ a message

A typical message: about 500 tokens you send and 500 it writes.

Chat with Claude Fable 5.1 (batch)
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Also:Claude Fable 5.1

Spec sheet

Published facts from the catalog, billed prices and what we measured here. Anything not measured says so.

Price, billed here

Input, per 1M tokens
$5.50provider $5.00
Output, per 1M tokens
$27.50provider $25.00
Cached input, per 1M
$0.1375provider $0.125
Cache write, per 1M
$6.875provider $6.25
Margin
+10%

Context and formats

Context window
1,000,000 tokens
Longest answer
128,000 tokens
Reads
text, images, and files
Makes
text
First listed
2026-09-01

Measured here, last 7 days

First token, median
not measured
Answered without error
not measured

Tools and JSON

Tool calling
declaredthe provider's claim, not yet measured here
JSON output
declaredthe provider's claim, not yet measured here

Price and latency history as JSON: GET /api/planet/history?id=anthropic/claude-fable-5.1:batch.

About

Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work: long code refactors, front-end and visual...

In Anthropic's words.

Try it here

The answer appears here.

Measured here

Call it

Use one OpenAI compatible endpoint, this model's id and an am_live_ key from the dashboard. You can also try it in chat first with no key.

curl https://useantimatter.com/v1/chat/completions \
  -H "Authorization: Bearer $ANTIMATTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "anthropic/claude-fable-5.1:batch", "messages": [{"role": "user", "content": "Hello"}]}'

Everything else is in the docs.

Embed this

A badge showing this model's live price per million tokens, as billed here, for a README or a site. It links back to this page.

Claude Fable 5.1 (batch) price on Antimatter
<a href="https://useantimatter.com/planet/anthropic/claude-fable-5.1%3Abatch"><img src="https://useantimatter.com/api/badge/price?id=anthropic%2Fclaude-fable-5.1%3Abatch" alt="Claude Fable 5.1 (batch) price on Antimatter" height="28"></a>

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