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Model comparison

GPT-5.6 Sol 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.

81.96/100
Margin
32.0pts
← winning
49.98/100
1 category wins0 category wins

Public leaderboard positions: GPT-5.6 Sol #3 (Supported); o4-mini (high) #118 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.

Evidence parity. GPT-5.6 Sol and o4-mini (high) share 2 comparable benchmark results. 1 of 8 categories are comparable. 44 results are unique to GPT-5.6 Sol; 0 to o4-mini (high).

Updated July 23, 2026
Shared results
2
GPT-5.6 Sol only
44
o4-mini (high) only
0
Comparable categories
1 / 8

Pick GPT-5.6 Sol if you want the stronger benchmark profile. o4-mini (high) only becomes the better choice if its workflow or ecosystem matters more than the raw scoreboard.

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

GPT-5.6 Sol is clearly ahead on the BenchAlign aggregate, 81.96 to 49.98. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.

GPT-5.6 Sol's sharpest advantage is in mathematics, where it averages 87.5 against 20.2. The single biggest benchmark swing on the page is FrontierMath v2 (Tier 4), 83.000% to 6.250%.

GPT-5.6 Sol gives you the larger context window at 1M, compared with 200K for o4-mini (high).

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 GPT-5.6 Sol and o4-mini (high)
CategoryGPT-5.6 SolΔo4-mini (high)
MathGPT-5.6 Sol87.5Margin← 67.3o4-mini (high)20.2
AgenticGPT-5.6 Sol92.0MarginNo overlapo4-mini (high)Not measured
CodingGPT-5.6 Sol64.6MarginNo overlapo4-mini (high)Not measured
KnowledgeGPT-5.6 Sol94.6MarginNo overlapo4-mini (high)Not measured
MultimodalGPT-5.6 Sol83.0MarginNo overlapo4-mini (high)Not measured

Decisive benchmark drivers

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

More
A · GPT-5.6 SolB · o4-mini (high)

  1. FrontierMath v2 (Tier 4)

    Math
    Source ↗
    A 83.000%B 6.250%
    Winner: GPT-5.6 SolΔ 76.8
    FrontierMath v2 (Tier 4): GPT-5.6 Sol scored 83.000%; o4-mini (high) scored 6.250%. GPT-5.6 Sol wins this benchmark.

  2. FrontierMath v2 (Tiers 1-3)

    Math
    Source ↗
    A 89.000%B 24.828%
    Winner: GPT-5.6 SolΔ 64.2
    FrontierMath v2 (Tiers 1-3): GPT-5.6 Sol scored 89.000%; o4-mini (high) scored 24.828%. GPT-5.6 Sol wins this benchmark.

Operational comparison

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

MetricGPT-5.6 Solo4-mini (high)Comparison
Input / output priceUSD per 1M tokensGPT-5.6 Sol$5 input / $30 outputo4-mini (high)Not availableA complete price comparison is not available.
Generation speedtokens per secondGPT-5.6 SolNot availableo4-mini (high)161 tok/sA complete speed comparison is not available.
First-answer latencyseconds to first tokenGPT-5.6 SolNot availableo4-mini (high)21.94 sA complete latency comparison is not available.
Context windowmaximum listed tokensGPT-5.6 Sol1Mo4-mini (high)200KGPT-5.6 Sol lists the larger context window.

Benchmark Deep Dive

Agentic
BenchmarkGPT-5.6 Solo4-mini (high)Result
Terminal-Bench 2.0Source 91.9%—Not comparable
BrowseCompSource 92.2%—Not comparable
OSWorld 2.0Source 62.6%—Not comparable
CyberGymSource 84.5%—Not comparable
ExploitGymSource 33.7%—Not comparable
ToolathlonSource 58%—Not comparable
AA Agentic IndexSource 54.0%—Not comparable
τ²-bench resultsSource 85.1%—Not comparable
GDPval-AASource 61.8%—Not comparable
GDPval-AASource 1736—Not comparable
AA BriefcaseSource 1501—Not comparable
AA ITBenchSource 56.2%—Not comparable
AA Tau3 BankingSource 33.0%—Not comparable
AA AutomationBenchSource 51.2%—Not comparable
AA Harvey LABSource 87.2%—Not comparable
terminalBenchHardSource 65.9%—Not comparable
aaTerminalBench21Source 88%—Not comparable
Coding
BenchmarkGPT-5.6 Solo4-mini (high)Result
SWE-bench ProSource 64.6%—Not comparable
Terminal-Bench 2.0Source 91.9%—Not comparable
deepSweSource 72.7%—Not comparable
FrontierCode 1.1 ExtendedSource 60.6%—Not comparable
cursorBench32Source 67.2%—Not comparable
VulcanBench v3Source 87.0%—Not comparable
AA Coding IndexSource 77.4%—Not comparable
AA-SciCodeSource 56.1%—Not comparable
Reasoning
BenchmarkGPT-5.6 Solo4-mini (high)Result
ARC-AGI-3Source 7.8%—Not comparable
GeneBench-ProSource 28.7%—Not comparable
AA-LCRSource 73.7%—Not comparable
CritPtSource 32.3%—Not comparable
Knowledge
BenchmarkGPT-5.6 Solo4-mini (high)Result
GPQASource 94.6%—Not comparable
GPQA-DSource 94.6%—Not comparable
HealthBench ProfessionalSource 60.5%—Not comparable
HealthBench HardSource 33.1%—Not comparable
Artificial Analysis Intelligence IndexSource 58.9%—Not comparable
AA-GPQA DiamondSource 94.1%—Not comparable
AA-HLESource 47.2%—Not comparable
AA-Omniscience IndexSource 21.7%—Not comparable
AA-Omniscience AccuracySource 58.5%—Not comparable
AA-Omniscience Hallucination RateSource 88.8%—Not comparable
MathGPT-5.6 Sol wins
BenchmarkGPT-5.6 Solo4-mini (high)Result
FrontierMath (legacy)Source 89%—Not comparable
FrontierMath v2 (Tiers 1-3)Source 89.000%24.828%GPT-5.6 Sol leads
FrontierMath v2 (Tier 4)Source 83.000%6.250%GPT-5.6 Sol leads
Multimodal
BenchmarkGPT-5.6 Solo4-mini (high)Result
MMMU-ProSource 83%—Not comparable
MMMU-Pro w/ PythonSource 84.6%—Not comparable
AA-MMMU-ProSource 83.4%—Not comparable
Inst. Following
BenchmarkGPT-5.6 Solo4-mini (high)Result
AA-IFBenchSource 72.7%—Not comparable
Frequently Asked Questions (2)

Which is better, GPT-5.6 Sol or o4-mini (high)?

GPT-5.6 Sol is ahead on BenchLM's BenchAlign leaderboard, 81.96 to 49.98. The biggest single separator in this matchup is FrontierMath v2 (Tier 4), where the scores are 83.000% and 6.250%.

Which is better for math, GPT-5.6 Sol or o4-mini (high)?

GPT-5.6 Sol has the edge for math in this comparison, averaging 87.5 versus 20.2. Inside this category, FrontierMath v2 (Tier 4) is the benchmark that creates the most daylight between them.

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