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Claude Opus 4.8

Claude Opus 4.8 (Adaptive Reasoning, Max Effort) is an AI model from Anthropic.

Publisher
Anthropic
Family
Claude
Context
1M
Input
Output
Released
28 May 2026

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Notes

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Context
1M
Input
$5
/1M tok
Output
$25
/1M tok
Blended
$10
#444/ 461/1M · 3:1
Speed
0
#115/ 461tok/s
Cache read
$0.50
0.10x input
Cache write
$6.25
1.25x input

Price & speed via Artificial Analysis · ranked across tracked models · caching via OpenRouter

Reported on 42 evals across 23 domains - best 94.4% on τ²-bench (Tau²-bench) · #16 of 321

Reported eval scores

42