Claude Opus 4.8
Claude Opus 4.8 (Adaptive Reasoning, Max Effort) is an AI model from Anthropic.
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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
38IFBench62.2
LiveBench - Math84.3
LiveBench80.1
Vals Index70.4
SAGE54.8
SciCode53.5
MortgageTax69.9
TaxEval v275.6
CorpFin v266.7