Model comparison
GPT-5.5 vs Grok 4
Head-to-head evidence from 16 shared benchmark results across 7 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: GPT-5.5 #9 (Estimated); Grok 4 #50 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. GPT-5.5 and Grok 4 share 16 comparable benchmark results. 1 of 8 categories are comparable. 41 results are unique to GPT-5.5; 0 to Grok 4.
Updated July 22, 2026- Shared results
- 16
- GPT-5.5 only
- 41
- Grok 4 only
- 0
- Comparable categories
- 1 / 8
Pick GPT-5.5 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 16 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-5.5 is clearly ahead on the BenchAlign aggregate, 73.51 to 60.42. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
GPT-5.5's sharpest advantage is in mathematics, where it averages 47.6 against 15.3. The single biggest benchmark swing on the page is FrontierMath v2 (Tier 4), 35.400% to 2.083%.
GPT-5.5 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-5.5 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-5.5 | Δ | Grok 4 |
|---|---|---|---|
| Math | GPT-5.547.6 | Margin← 32.3 | Grok 415.3 |
| Agentic | GPT-5.581.6 | MarginNo overlap | Grok 4Not measured |
| Coding | GPT-5.558.6 | MarginNo overlap | Grok 4Not measured |
| Reasoning | GPT-5.585.0 | MarginNo overlap | Grok 4Not measured |
| Knowledge | GPT-5.557.8 | MarginNo overlap | Grok 4Not measured |
| Multimodal | GPT-5.570.4 | 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 35.400%B 2.083%Winner: GPT-5.5Δ 33.3FrontierMath v2 (Tier 4): GPT-5.5 scored 35.400%; Grok 4 scored 2.083%. GPT-5.5 wins this benchmark. - Source ↗
FrontierMath v2 (Tiers 1-3)
MathA 51.700%B 19.655%Winner: GPT-5.5Δ 32FrontierMath v2 (Tiers 1-3): GPT-5.5 scored 51.700%; Grok 4 scored 19.655%. GPT-5.5 wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | GPT-5.5 | Grok 4 | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | GPT-5.5$5 input / $30 output | Grok 4Not available | A complete price comparison is not available. |
| Generation speedtokens per second | GPT-5.5Not available | Grok 454 tok/s | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | GPT-5.5Not available | Grok 415.60 s | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | GPT-5.51M | Grok 4128K | GPT-5.5 lists the larger context window. |
Benchmark Deep Dive
Agentic24 benchmarks
| Benchmark | GPT-5.5 | Grok 4 | Result |
|---|---|---|---|
| Terminal-Bench 2.0Source | 82% | — | Not comparable |
| CyberGymSource | 81.8% | — | Not comparable |
| BrowseCompSource | 84.4% | — | Not comparable |
| OSWorld-VerifiedSource | 78.7% | — | Not comparable |
| MCP AtlasSource | 75.3% | — | Not comparable |
| ToolathlonSource | 55.6% | — | Not comparable |
| τ²-bench resultsSource | 93.9% | 74.9% | GPT-5.5 leads |
| AA Agentic IndexSource | 44.9% | — | Not comparable |
| APEX-Agents-AASource | 37.7% | — | Not comparable |
| GDPval-AASource | 49.5% | — | Not comparable |
| GDPval-AASource | 1490 | — | Not comparable |
| Gert LabsSource | 72.93% | 42.34% | GPT-5.5 leads |
| ResearchClawBenchSource | 17.0% | — | Not comparable |
| OSWorld 2.0Source | 13.0% | — | Not comparable |
| JobBenchSource | 42.7% | — | Not comparable |
| ExploitGymSource | 13.4% | — | Not comparable |
| AA BriefcaseSource | 1154 | — | Not comparable |
| AA AutomationBenchSource | 42.1% | — | Not comparable |
| AA EnterpriseOps-GymSource | 46.6% | — | Not comparable |
| AA Harvey LABSource | 86.3% | — | Not comparable |
| AA ITBenchSource | 45.8% | — | Not comparable |
| AA Tau3 BankingSource | 31.3% | — | Not comparable |
| terminalBenchHardSource | 60.6% | — | Not comparable |
| aaTerminalBench21Source | 84.3% | — | Not comparable |
Coding9 benchmarks
| Benchmark | GPT-5.5 | Grok 4 | Result |
|---|---|---|---|
| SWE-bench ProSource | 58.6% | — | Not comparable |
| Terminal-Bench 2.0Source | 82.0% | — | Not comparable |
| Vibe Code BenchSource | 69.85% | — | Not comparable |
| React Native EvalsSource | 84.7% | 72.6% | GPT-5.5 leads |
| cursorBench31Source | 59.2% | — | Not comparable |
| cursorBench32Source | 58.4% | — | Not comparable |
| AA Coding IndexSource | 74.9% | — | Not comparable |
| AA-SciCodeSource | 56.1% | 45.7% | GPT-5.5 leads |
| FrontierCode 1.1 MainSource | 43.0% | — | Not comparable |
Reasoning5 benchmarks
Knowledge10 benchmarks
| Benchmark | GPT-5.5 | Grok 4 | Result |
|---|---|---|---|
| GPQASource | 93.6% | — | Not comparable |
| GPQA-DSource | 93.6% | — | Not comparable |
| HLESource | 52.2% | — | Not comparable |
| HLE w/o toolsSource | 41.4% | — | Not comparable |
| Artificial Analysis Intelligence IndexSource | 54.8% | 33.3% | GPT-5.5 leads |
| AA-GPQA DiamondSource | 93.5% | 87.7% | GPT-5.5 leads |
| AA-HLESource | 44.3% | 23.9% | GPT-5.5 leads |
| AA-Omniscience IndexSource | 20.1% | 3.8% | GPT-5.5 leads |
| AA-Omniscience AccuracySource | 56.9% | 41.4% | GPT-5.5 leads |
| AA-Omniscience Hallucination RateSource | 85.5% | 64.2% | Grok 4 leads |
MathGPT-5.5 wins3 benchmarks
Multimodal5 benchmarks
Inst. Following1 benchmarks
| Benchmark | GPT-5.5 | Grok 4 | Result |
|---|---|---|---|
| AA-IFBenchSource | 75.9% | 53.7% | GPT-5.5 leads |
Frequently Asked Questions (2)
Which is better, GPT-5.5 or Grok 4?
GPT-5.5 is ahead on BenchLM's BenchAlign leaderboard, 73.51 to 60.42. The biggest single separator in this matchup is FrontierMath v2 (Tier 4), where the scores are 35.400% and 2.083%.
Which is better for math, GPT-5.5 or Grok 4?
GPT-5.5 has the edge for math in this comparison, averaging 47.6 versus 15.3. Inside this category, FrontierMath v2 (Tier 4) is the benchmark that creates the most daylight between them.
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