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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
#435/ 458/1M · 3:1
Speed
55
#182/ 458tok/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 38 evals across 21 domains - best 94.4% on τ²-bench (Tau²-bench) · #17 of 343

Reported eval scores

38