Model comparison
GPT-5.6 Sol vs o3
Head-to-head evidence from 14 shared benchmark results across 7 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: GPT-5.6 Sol #3 (Supported); o3 #131 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. GPT-5.6 Sol and o3 share 14 comparable benchmark results. 1 of 8 categories are comparable. 32 results are unique to GPT-5.6 Sol; 2 to o3.
Updated July 23, 2026- Shared results
- 14
- GPT-5.6 Sol only
- 32
- o3 only
- 2
- Comparable categories
- 1 / 8
Pick GPT-5.6 Sol if you want the stronger benchmark profile. o3 only becomes the better choice if you want the cheaper token bill.
Confidence note. This is a partial-evidence comparison with 14 shared benchmark results across 7 evidence categories; 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 47.89. 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 14.5. The single biggest benchmark swing on the page is FrontierMath v2 (Tier 4), 83.000% to 2.083%.
GPT-5.6 Sol is also the more expensive model on tokens at $5.00 input / $30.00 output per 1M tokens, versus $2.00 input / $8.00 output per 1M tokens for o3. That is roughly 3.8x on output cost alone. GPT-5.6 Sol gives you the larger context window at 1M, compared with 200K for o3.
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 | GPT-5.6 Sol | Δ | o3 |
|---|---|---|---|
| Math | GPT-5.6 Sol87.5 | Margin← 73.0 | o314.5 |
| Agentic | GPT-5.6 Sol92.0 | MarginNo overlap | o3Not measured |
| Coding | GPT-5.6 Sol64.6 | MarginNo overlap | o3Not measured |
| Knowledge | GPT-5.6 Sol94.6 | MarginNo overlap | o3Not measured |
| Multimodal | GPT-5.6 Sol83.0 | MarginNo overlap | o3Not measured |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
FrontierMath v2 (Tier 4)
MathA 83.000%B 2.083%Winner: GPT-5.6 SolΔ 80.9FrontierMath v2 (Tier 4): GPT-5.6 Sol scored 83.000%; o3 scored 2.083%. GPT-5.6 Sol wins this benchmark. - Source ↗
FrontierMath v2 (Tiers 1-3)
MathA 89.000%B 18.685%Winner: GPT-5.6 SolΔ 70.3FrontierMath v2 (Tiers 1-3): GPT-5.6 Sol scored 89.000%; o3 scored 18.685%. 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 | o3 | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | GPT-5.6 Sol$5 input / $30 output | o3$2 input / $8 output | o3 has the lower combined listed price. |
| Generation speedtokens per second | GPT-5.6 SolNot available | o3118 tok/s | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | GPT-5.6 SolNot available | o35.38 s | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | GPT-5.6 Sol1M | o3200K | GPT-5.6 Sol lists the larger context window. |
Benchmark Deep Dive
Agentic17 benchmarks
| Benchmark | GPT-5.6 Sol | o3 | 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% | 80.7% | 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 |
Coding8 benchmarks
| Benchmark | GPT-5.6 Sol | o3 | 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% | 41.0% | GPT-5.6 Sol leads |
Reasoning4 benchmarks
Knowledge10 benchmarks
| Benchmark | GPT-5.6 Sol | o3 | 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% | 30.4% | GPT-5.6 Sol leads |
| AA-GPQA DiamondSource | 94.1% | 82.7% | GPT-5.6 Sol leads |
| AA-HLESource | 47.2% | 20.0% | GPT-5.6 Sol leads |
| AA-Omniscience IndexSource | 21.7% | -15.3% | GPT-5.6 Sol leads |
| AA-Omniscience AccuracySource | 58.5% | 38.4% | GPT-5.6 Sol leads |
| AA-Omniscience Hallucination RateSource | 88.8% | 87.1% | o3 leads |
MathGPT-5.6 Sol wins4 benchmarks
Multimodal4 benchmarks
Inst. Following1 benchmarks
| Benchmark | GPT-5.6 Sol | o3 | Result |
|---|---|---|---|
| AA-IFBenchSource | 72.7% | 71.4% | GPT-5.6 Sol leads |
Frequently Asked Questions (2)
Which is better, GPT-5.6 Sol or o3?
GPT-5.6 Sol is ahead on BenchLM's BenchAlign leaderboard, 81.96 to 47.89. The biggest single separator in this matchup is FrontierMath v2 (Tier 4), where the scores are 83.000% and 2.083%.
Which is better for math, GPT-5.6 Sol or o3?
GPT-5.6 Sol has the edge for math in this comparison, averaging 87.5 versus 14.5. Inside this category, FrontierMath v2 (Tier 4) is the benchmark that creates the most daylight between them.
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