Claude Fable 5.1
by Anthropic · ID claude-fable-5-1 · Released 2026-09 · Proprietary
-
ELO Score
-
MMLU
-
HumanEval
1M
Context Window
$10.00
Input Price
About Claude Fable 5.1
Anthropic's flagship, released 1 September 2026. Input and output prices are unchanged from Fable 5, but cache reads fall from $1.00 to $0.25 per million, a 75% cut that makes repeated long-context work far cheaper than the headline price suggests. Cache writes $12.50 for five minutes, $20.00 for an hour. 1M-token context, up to 128K tokens per answer. Prices checked 1 September 2026.
Not sure where to find it? Search query: "Claude Fable 5.1 official"