Model comparison

GPT-5.6 Sol vs o1

Data verified July 23, 2026

Head-to-head evidence from 14 shared benchmark results across 6 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.

GPT-5.6 Sol

OpenAI

81.96/100

Margin

33.9pts

← winning

OpenAI

48.1/100

2 category wins0 category wins

Public leaderboard positions: GPT-5.6 Sol #3 (Supported); o1 #129 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.

Evidence parity. GPT-5.6 Sol and o1 share 14 comparable benchmark results. 2 of 8 categories are comparable. 32 results are unique to GPT-5.6 Sol; 2 to o1.

Updated July 23, 2026

Shared results: 14
GPT-5.6 Sol only: 32
o1 only: 2
Comparable categories: 2 / 8

Pick GPT-5.6 Sol if you want the stronger benchmark profile. o1 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 14 shared benchmark results across 6 evidence categories; 2 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 48.1. 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 9.3. The single biggest benchmark swing on the page is FrontierMath v2 (Tiers 1-3), 89.000% to 9.310%.

o1 is also the more expensive model on tokens at $15.00 input / $60.00 output per 1M tokens, versus $5.00 input / $30.00 output per 1M tokens for GPT-5.6 Sol. That is roughly 2.0x on output cost alone. GPT-5.6 Sol gives you the larger context window at 1M, compared with 200K for o1.

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 o1
Category	GPT-5.6 Sol	Δ	o1
Math	GPT-5.6 Sol87.5	Margin← 78.2	o19.3
Knowledge	GPT-5.6 Sol94.6	Margin← 18.9	o175.7
Agentic	GPT-5.6 Sol92.0	MarginNo overlap	o1Not measured
Coding	GPT-5.6 Sol64.6	MarginNo overlap	o1Not measured
Multimodal	GPT-5.6 Sol83.0	MarginNo overlap	o1Not measured
Inst. Following	GPT-5.6 SolNot measured	MarginNo overlap	o192.2

Decisive benchmark drivers

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

A · GPT-5.6 SolB · o1

FrontierMath v2 (Tiers 1-3)
Math
Source ↗
A 89.000%B 9.310%
Winner: GPT-5.6 SolΔ 79.7
FrontierMath v2 (Tiers 1-3): GPT-5.6 Sol scored 89.000%; o1 scored 9.310%. GPT-5.6 Sol wins this benchmark.
GPQA
Knowledge
Source ↗
A 94.6%B 75.7%
Winner: GPT-5.6 SolΔ 18.9
GPQA: GPT-5.6 Sol scored 94.6%; o1 scored 75.7%. GPT-5.6 Sol wins this benchmark.

Operational comparison

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

Metric	GPT-5.6 Sol	o1	Comparison
Input / output priceUSD per 1M tokens	GPT-5.6 Sol$5 input / $30 output	o1$15 input / $60 output	GPT-5.6 Sol has the lower combined listed price.
Generation speedtokens per second	GPT-5.6 SolNot available	o198 tok/s	A complete speed comparison is not available.
First-answer latencyseconds to first token	GPT-5.6 SolNot available	o132.29 s	A complete latency comparison is not available.
Context windowmaximum listed tokens	GPT-5.6 Sol1M	o1200K	GPT-5.6 Sol lists the larger context window.

Benchmark Deep Dive

Agentic

17 benchmarks

Benchmark	GPT-5.6 Sol	o1	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%	62.6%	GPT-5.6 Sol leads
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

8 benchmarks

Benchmark	GPT-5.6 Sol	o1	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%	39.7%	GPT-5.6 Sol leads
AA-SciCodeSource	56.1%	35.8%	GPT-5.6 Sol leads

Reasoning

4 benchmarks

Benchmark	GPT-5.6 Sol	o1	Result
ARC-AGI-3Source	7.8%	—	Not comparable
GeneBench-ProSource	28.7%	—	Not comparable
AA-LCRSource	73.7%	59.3%	GPT-5.6 Sol leads
CritPtSource	32.3%	0.3%	GPT-5.6 Sol leads

KnowledgeGPT-5.6 Sol wins

11 benchmarks

Benchmark	GPT-5.6 Sol	o1	Result
GPQASource	94.6%	75.7%	GPT-5.6 Sol leads
GPQA-DSource	94.6%	—	Not comparable
HealthBench ProfessionalSource	60.5%	—	Not comparable
HealthBench HardSource	33.1%	—	Not comparable
Artificial Analysis Intelligence IndexSource	58.9%	23.4%	GPT-5.6 Sol leads
AA-GPQA DiamondSource	94.1%	74.7%	GPT-5.6 Sol leads
AA-HLESource	47.2%	7.7%	GPT-5.6 Sol leads
AA-Omniscience IndexSource	21.7%	-10.5%	GPT-5.6 Sol leads
AA-Omniscience AccuracySource	58.5%	34.7%	GPT-5.6 Sol leads
AA-Omniscience Hallucination RateSource	88.8%	69.3%	o1 leads
MMLUSource	—	91.8%	Not comparable

MathGPT-5.6 Sol wins

3 benchmarks

Benchmark	GPT-5.6 Sol	o1	Result
FrontierMath (legacy)Source	89%	—	Not comparable
FrontierMath v2 (Tiers 1-3)Source	89.000%	9.310%	GPT-5.6 Sol leads
FrontierMath v2 (Tier 4)Source	83.000%	—	Not comparable

Multimodal

3 benchmarks

Benchmark	GPT-5.6 Sol	o1	Result
MMMU-ProSource	83%	—	Not comparable
MMMU-Pro w/ PythonSource	84.6%	—	Not comparable
AA-MMMU-ProSource	83.4%	—	Not comparable

Inst. Following

2 benchmarks

Benchmark	GPT-5.6 Sol	o1	Result
AA-IFBenchSource	72.7%	70.3%	GPT-5.6 Sol leads
IFEvalSource	—	92.2%	Not comparable

Frequently Asked Questions (3)

Which is better, GPT-5.6 Sol or o1?

GPT-5.6 Sol is ahead on BenchLM's BenchAlign leaderboard, 81.96 to 48.1. The biggest single separator in this matchup is FrontierMath v2 (Tiers 1-3), where the scores are 89.000% and 9.310%.

Which is better for knowledge tasks, GPT-5.6 Sol or o1?

GPT-5.6 Sol has the edge for knowledge tasks in this comparison, averaging 94.6 versus 75.7. Inside this category, AA-HLE is the benchmark that creates the most daylight between them.

Which is better for math, GPT-5.6 Sol or o1?

GPT-5.6 Sol has the edge for math in this comparison, averaging 87.5 versus 9.3. Inside this category, FrontierMath v2 (Tiers 1-3) is the benchmark that creates the most daylight between them.

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