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Description
Claude Fable 5.1 is Anthropic's most capable reasoning model in batch mode, an incremental improvement over Claude Fable 5 with a 1 million token context window.
OpenAI's frontier model for complex professional workloads. 1M token context, text + image input, native computer use.
I/O price /1M
$5.00/$25.00
$5.00/$30.00
Input /1M
$5.00
$5.00
Output /1M
$25.00
$30.00
Cached in /1M
$0.125
$0.5
Context
1M
1M
Δ input since launch
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—
Δ output since launch
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Released
Sep 2026
Apr 2026
Status
—
—
Provider
Anthropic
OpenAI