Model comparison
GPT-5.6 Sol vs Grok 4
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); Grok 4 #50 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. GPT-5.6 Sol and Grok 4 share 14 comparable benchmark results. 1 of 8 categories are comparable. 32 results are unique to GPT-5.6 Sol; 2 to Grok 4.
Updated July 23, 2026- Shared results
- 14
- GPT-5.6 Sol only
- 32
- Grok 4 only
- 2
- Comparable categories
- 1 / 8
Pick GPT-5.6 Sol if you want the stronger benchmark profile. Grok 4 only becomes the better choice if you would rather avoid the extra latency and token burn of a reasoning model.
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 60.42. 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 15.3. The single biggest benchmark swing on the page is FrontierMath v2 (Tier 4), 83.000% to 2.083%.
GPT-5.6 Sol is the reasoning model in the pair, while Grok 4 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. GPT-5.6 Sol gives you the larger context window at 1M, compared with 128K for Grok 4.
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 | Grok 4 |
|---|---|---|---|
| Math | GPT-5.6 Sol87.5 | Margin← 72.2 | Grok 415.3 |
| Agentic | GPT-5.6 Sol92.0 | MarginNo overlap | Grok 4Not measured |
| Coding | GPT-5.6 Sol64.6 | MarginNo overlap | Grok 4Not measured |
| Knowledge | GPT-5.6 Sol94.6 | MarginNo overlap | Grok 4Not measured |
| Multimodal | GPT-5.6 Sol83.0 | MarginNo overlap | Grok 4Not 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%; Grok 4 scored 2.083%. GPT-5.6 Sol wins this benchmark. - Source ↗
FrontierMath v2 (Tiers 1-3)
MathA 89.000%B 19.655%Winner: GPT-5.6 SolΔ 69.3FrontierMath v2 (Tiers 1-3): GPT-5.6 Sol scored 89.000%; Grok 4 scored 19.655%. 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 | Grok 4 | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | GPT-5.6 Sol$5 input / $30 output | Grok 4Not available | A complete price comparison is not available. |
| Generation speedtokens per second | GPT-5.6 SolNot available | Grok 454 tok/s | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | GPT-5.6 SolNot available | Grok 415.60 s | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | GPT-5.6 Sol1M | Grok 4128K | GPT-5.6 Sol lists the larger context window. |
Benchmark Deep Dive
Agentic18 benchmarks
| Benchmark | GPT-5.6 Sol | Grok 4 | 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% | 74.9% | 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 |
| Gert LabsSource | — | 42.34% | Not comparable |
Coding9 benchmarks
| Benchmark | GPT-5.6 Sol | Grok 4 | 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% | 45.7% | GPT-5.6 Sol leads |
| React Native EvalsSource | — | 72.6% | Not comparable |
Reasoning4 benchmarks
Knowledge10 benchmarks
| Benchmark | GPT-5.6 Sol | Grok 4 | 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% | 33.3% | GPT-5.6 Sol leads |
| AA-GPQA DiamondSource | 94.1% | 87.7% | GPT-5.6 Sol leads |
| AA-HLESource | 47.2% | 23.9% | GPT-5.6 Sol leads |
| AA-Omniscience IndexSource | 21.7% | 3.8% | GPT-5.6 Sol leads |
| AA-Omniscience AccuracySource | 58.5% | 41.4% | GPT-5.6 Sol leads |
| AA-Omniscience Hallucination RateSource | 88.8% | 64.2% | Grok 4 leads |
MathGPT-5.6 Sol wins3 benchmarks
Multimodal3 benchmarks
Inst. Following1 benchmarks
| Benchmark | GPT-5.6 Sol | Grok 4 | Result |
|---|---|---|---|
| AA-IFBenchSource | 72.7% | 53.7% | GPT-5.6 Sol leads |
Frequently Asked Questions (2)
Which is better, GPT-5.6 Sol or Grok 4?
GPT-5.6 Sol is ahead on BenchLM's BenchAlign leaderboard, 81.96 to 60.42. 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 Grok 4?
GPT-5.6 Sol has the edge for math in this comparison, averaging 87.5 versus 15.3. Inside this category, FrontierMath v2 (Tier 4) is the benchmark that creates the most daylight between them.
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