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Model comparison

Claude Opus 4.5 vs o4-mini (high)

Data verified

Head-to-head evidence from 2 shared benchmark results across 1 category. Overall scores shown here use the public BenchAlign v5 ranking lane.

64.22/100
Margin
14.2pts
← winning
49.98/100
1 category wins0 category wins

Public leaderboard positions: Claude Opus 4.5 #34 (Supported); o4-mini (high) #118 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.

Evidence parity. Claude Opus 4.5 and o4-mini (high) share 2 comparable benchmark results. 1 of 8 categories are comparable. 57 results are unique to Claude Opus 4.5; 0 to o4-mini (high).

Updated July 22, 2026
Shared results
2
Claude Opus 4.5 only
57
o4-mini (high) only
0
Comparable categories
1 / 8

Pick Claude Opus 4.5 if you want the stronger benchmark profile. o4-mini (high) only becomes the better choice if you want the stronger reasoning-first profile.

Confidence note. This is a partial-evidence comparison with 2 shared benchmark results across 1 evidence category; 1 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.

Why this result

Claude Opus 4.5 is clearly ahead on the BenchAlign aggregate, 64.22 to 49.98. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.

Claude Opus 4.5's sharpest advantage is in mathematics, where it averages 57.5 against 20.2. The single biggest benchmark swing on the page is FrontierMath v2 (Tiers 1-3), 20.690% to 24.828%.

o4-mini (high) is the reasoning model in the pair, while Claude Opus 4.5 is not. That usually helps on harder chain-of-thought-heavy tests, but it can also mean more latency and more token spend in real use.

Category breakdown

Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.

Category scores and score margins for Claude Opus 4.5 and o4-mini (high)
CategoryClaude Opus 4.5Δo4-mini (high)
MathClaude Opus 4.557.5Margin← 37.3o4-mini (high)20.2
AgenticClaude Opus 4.562.6MarginNo overlapo4-mini (high)Not measured
CodingClaude Opus 4.571.7MarginNo overlapo4-mini (high)Not measured
ReasoningClaude Opus 4.564.4MarginNo overlapo4-mini (high)Not measured
KnowledgeClaude Opus 4.558.1MarginNo overlapo4-mini (high)Not measured
MultilingualClaude Opus 4.585.7MarginNo overlapo4-mini (high)Not measured
MultimodalClaude Opus 4.569.9MarginNo overlapo4-mini (high)Not measured
Inst. FollowingClaude Opus 4.569.5MarginNo overlapo4-mini (high)Not measured

Decisive benchmark drivers

The largest measured benchmark gaps in this matchup, with exact reported values.

More
A · Claude Opus 4.5B · o4-mini (high)

  1. FrontierMath v2 (Tiers 1-3)

    Math
    Source ↗
    A 20.690%B 24.828%
    Winner: o4-mini (high)Δ 4.1
    FrontierMath v2 (Tiers 1-3): Claude Opus 4.5 scored 20.690%; o4-mini (high) scored 24.828%. o4-mini (high) wins this benchmark.

  2. FrontierMath v2 (Tier 4)

    Math
    Source ↗
    A 4.167%B 6.250%
    Winner: o4-mini (high)Δ 2.1
    FrontierMath v2 (Tier 4): Claude Opus 4.5 scored 4.167%; o4-mini (high) scored 6.250%. o4-mini (high) wins this benchmark.

Operational comparison

Runtime and commercial metrics are compared only when both models have a complete sourced value.

MetricClaude Opus 4.5o4-mini (high)Comparison
Input / output priceUSD per 1M tokensClaude Opus 4.5$5 input / $25 outputo4-mini (high)Not availableA complete price comparison is not available.
Generation speedtokens per secondClaude Opus 4.546 tok/so4-mini (high)161 tok/so4-mini (high) has the higher measured throughput.
First-answer latencyseconds to first tokenClaude Opus 4.51.01 so4-mini (high)21.94 sClaude Opus 4.5 reaches the first token sooner.
Context windowmaximum listed tokensClaude Opus 4.5200Ko4-mini (high)200KListed context windows are equal.

Benchmark Deep Dive

Agentic
BenchmarkClaude Opus 4.5o4-mini (high)Result
Terminal-Bench 2.0Source 59.3%—Not comparable
OSWorld-VerifiedSource 66.3%—Not comparable
OSWorldSource 66.3%—Not comparable
Claw-EvalSource 59.6%—Not comparable
QwenClawBenchSource 52.3%—Not comparable
τ³-bench resultsSource 70.2%—Not comparable
VITA-BenchSource 23.3%—Not comparable
DeepPlanningSource 26.4%—Not comparable
ToolathlonSource 43.5%—Not comparable
MCP AtlasSource 42.3%—Not comparable
MCP-TasksSource 71.8%—Not comparable
WideResearchSource 76.4%—Not comparable
CyberGymSource 50.6%—Not comparable
τ²-bench resultsSource 86.3%—Not comparable
Gert LabsSource 64.23%—Not comparable
JobBenchSource 32.3%—Not comparable
Coding
BenchmarkClaude Opus 4.5o4-mini (high)Result
SWE-bench VerifiedSource 80.9%—Not comparable
LiveCodeBench v6Source 84.8%—Not comparable
SWE-bench ProSource 57.1%—Not comparable
SWE MultilingualSource 77.5%—Not comparable
NL2RepoSource 43.2%—Not comparable
AA-SciCodeSource 47.0%—Not comparable
Reasoning
BenchmarkClaude Opus 4.5o4-mini (high)Result
LongBench v2Source 64.4%—Not comparable
AI-NeedleSource 74%—Not comparable
AA-LCRSource 65.3%—Not comparable
CritPtSource 0.3%—Not comparable
Knowledge
BenchmarkClaude Opus 4.5o4-mini (high)Result
GPQASource 87%—Not comparable
SuperGPQASource 70.6%—Not comparable
MMLU-ProSource 89.5%—Not comparable
MMLU-ReduxSource 96.6%—Not comparable
C-EvalSource 92.2%—Not comparable
HLESource 30.8%—Not comparable
Artificial Analysis Intelligence IndexSource 34.7%—Not comparable
AA-GPQA DiamondSource 81.0%—Not comparable
AA-HLESource 12.9%—Not comparable
AA-Omniscience IndexSource -3.9%—Not comparable
AA-Omniscience AccuracySource 40.7%—Not comparable
AA-Omniscience Hallucination RateSource 75.4%—Not comparable
AA MMLU-ProSource 88.9%—Not comparable
MathClaude Opus 4.5 wins
BenchmarkClaude Opus 4.5o4-mini (high)Result
AIME26Source 95.1%—Not comparable
HMMT Feb 2025Source 92.9%—Not comparable
HMMT Nov 2025Source 93.3%—Not comparable
HMMT Feb 2026Source 85.3%—Not comparable
MMAnswerBenchSource 84.0%—Not comparable
FrontierMath v2 (Tiers 1-3)Source 20.690%24.828%o4-mini (high) leads
FrontierMath v2 (Tier 4)Source 4.167%6.250%o4-mini (high) leads
Multilingual
BenchmarkClaude Opus 4.5o4-mini (high)Result
MMLU-ProXSource 85.7%—Not comparable
NOVA-63Source 56.7%—Not comparable
Multimodal
BenchmarkClaude Opus 4.5o4-mini (high)Result
MMMU-ProSource 70.6%—Not comparable
MathVisionSource 74.3%—Not comparable
CharXivSource 68.5%—Not comparable
VideoMMMUSource 84.4%—Not comparable
ScreenSpot ProSource 45.7%—Not comparable
V*Source 67.0%—Not comparable
AA-MMMU-ProSource 71.2%—Not comparable
Design Arena WebsiteSource 1277—Not comparable
Inst. Following
BenchmarkClaude Opus 4.5o4-mini (high)Result
IFEvalSource 90.9%—Not comparable
IFBenchSource 58%—Not comparable
AA-IFBenchSource 43.0%—Not comparable
Frequently Asked Questions (2)

Which is better, Claude Opus 4.5 or o4-mini (high)?

Claude Opus 4.5 is ahead on BenchLM's BenchAlign leaderboard, 64.22 to 49.98. The biggest single separator in this matchup is FrontierMath v2 (Tiers 1-3), where the scores are 20.690% and 24.828%.

Which is better for math, Claude Opus 4.5 or o4-mini (high)?

Claude Opus 4.5 has the edge for math in this comparison, averaging 57.5 versus 20.2. Inside this category, FrontierMath v2 (Tiers 1-3) is the benchmark that creates the most daylight between them.

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