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Claude Fable 5

Anthropic · released 9 Jun 2026 · proprietary API

Anthropic's most capable widely-released model; top-end reasoning + agentic work.

Context window

1M

1,000,000 tokens

Input price

$10

per 1M tokens

Output price

$50

per 1M tokens

Blended

$20

3:1 in:out mix

Weights

Proprietary

API only

Released

9 Jun 2026

Anthropic

Where it ranks

Of the 16 models tracked, Claude Fable 5 is #16 cheapest to run (blended $/1M at a 3:1 input:output mix), #16 by input price, and #2 (tied) by context window.

See the full Frontier Index →

Compare with

The nearest models by blended cost to run.

Put it to work

Specs from BitByteCore's hand-verified Frontier Ledger (v2026-07-04, verified 21 Jun 2026). Model pricing moves fast — confirm with Anthropic before you rely on a figure.