Which is better, Claude 4 Opus or Claude Sonnet 4?

Across 63 shared benchmarks tracked on Vector Wire, Claude 4 Opus leads on 34 and Claude Sonnet 4 leads on 24 — Claude 4 Opus leads on more. Strengths differ by axis; the table below shows every head-to-head number with provenance.

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Claude 4 Opus vs Claude Sonnet 4

AnthropicvsAnthropic63 shared benchmarks34–24 head-to-head

Benchmark	Claude 4 Opus	Claude Sonnet 4
AA Intelligence	31.7	29.8
AA-LCR	40	69.7
AceBench	75.6	76.2
aider_polyglot	70.7	70.7
AIME	33.9	33.1
AIME 2024	76	43.4
AIME 2025	75.5	74
AIR-Bench 2024	85.7	88.3
anthropic_red_team	98.9	99.2
arc_agi_1	27	63.7
ARC-AGI-2	8.6	13.6
arena_vision	1207	1207
Artificial Analysis Coding Index	34	37.6
AutoLogi	86.1	89.8
bbq	99.3	97.9
CNMO 2024	57.6	60.4
Fortress	27.6	24.4
frontiermath_tier_4	4.2	0
GPQA Diamond	79.6	78
harmbench	91.7	98
HLE	12.3	10.7
HMMT 2025	15.9	15.9
IFBench	53.7	55
ifeval	87.4	87.6
livebench	74.6	74.8
LiveCodeBench	70.4	68.5
LiveCodeBench v6	47.4	48.5
livecodebench_easy	99.1	98.8
livecodebench_hard	33.1	32.6
livecodebench_medium	80.4	76
math_500_em	98.2	94
mmlu	92.9	91.5
mmlu_redux	94.2	93.6
MMLU-Pro	86.6	84
mmmlu	88.8	86.5
MMMU	73.7	74.4
multichallenge	58.6	57.1
MultiNRC	33.9	18.4
MultiPL-E	89.6	88.6
OJBench	19.6	15.3
PolyMath-en	49.8	52.8
scicode	40.9	40
SEAL VISTA	47	45.5
simple_safety_tests	100	100
simplebench	58.8	45.5
simpleqa	22.8	15.9
supergpqa	56.5	55.7
swe_bench_bash	67.6	64.9
SWE-bench Verified	79.4	80.2
TAU-bench (airline)	59.6	60
TAU-bench (retail)	81.4	80.5
Tau2 airline	60	55.5
Tau2 retail	81.8	75
Terminal-Bench	43.2	36.4
Terminal-Bench Hard	31.1	31.1
vectara_answer_rate	91	98.6
vectara_avg_summary_length	123.2	145.8
vectara_factual_consistency	88	89.7
vectara_hallucination_rate ↓	12	10.3
xstest	97	97.2
ZebraLogic	95.1	73.7
τ²-Bench	57	65
τ²-Bench Telecom (AA run)	73.4	64.6

Best tracked score per model per benchmark (default configuration; source-attributed). ↓ marks lower-is-better metrics. Open either model for its full surface, provenance and pricing.