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Claude Opus 4.8

CALIBRATING

Anthropic · anthropic/claude-opus-4.8 · verdict as of 2026-07-03

Daily test history (90 days, baseline band = trailing mean ± 2σ)

Structured Extraction

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Math & Reasoning

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Code Generation

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Game Design

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Instruction Following

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Report Analysis

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Summarization

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Customer Service

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Web Design

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Creative Writing

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Serving providers (last 30 days)

striped = multiple providers served this model that day (hover for detail)

Public benchmarks overall 89.9

MMLU-Pro

90

GPQA Diamond

87

SWE-bench Verified

81

LMArena Elo

1470

AIME 2025

92

retrieved 2026-07-02 from public sources — see methodology

Recent samples (latest run, one per test case)