Model comparison
GPT-5.1 vs Grok 3 [Beta]
Head-to-head evidence from 2 shared benchmark results across 1 category. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: GPT-5.1 #94 (Estimated); Grok 3 [Beta] #171 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. GPT-5.1 and Grok 3 [Beta] share 2 comparable benchmark results. 1 of 8 categories are comparable. 19 results are unique to GPT-5.1; 0 to Grok 3 [Beta].
Updated July 20, 2026- Shared results
- 2
- GPT-5.1 only
- 19
- Grok 3 [Beta] only
- 0
- Comparable categories
- 1 / 8
Pick GPT-5.1 if you want the stronger benchmark profile. Grok 3 [Beta] 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 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-5.1 is clearly ahead on the BenchAlign aggregate, 53.65 to 40.43. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
GPT-5.1's sharpest advantage is in mathematics, where it averages 26.4 against 2.8. The single biggest benchmark swing on the page is FrontierMath v2 (Tiers 1-3), 31.034% to 3.793%.
GPT-5.1 is the reasoning model in the pair, while Grok 3 [Beta] 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-5.1 gives you the larger context window at 200K, compared with 128K for Grok 3 [Beta].
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-5.1 | Δ | Grok 3 [Beta] |
|---|---|---|---|
| Math | GPT-5.126.4 | Margin← 23.6 | Grok 3 [Beta]2.8 |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
FrontierMath v2 (Tiers 1-3)
MathA 31.034%B 3.793%Winner: GPT-5.1Δ 27.2FrontierMath v2 (Tiers 1-3): GPT-5.1 scored 31.034%; Grok 3 [Beta] scored 3.793%. GPT-5.1 wins this benchmark. - Source ↗
FrontierMath v2 (Tier 4)
MathA 12.500%B 0.000%Winner: GPT-5.1Δ 12.5FrontierMath v2 (Tier 4): GPT-5.1 scored 12.500%; Grok 3 [Beta] scored 0.000%. GPT-5.1 wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | GPT-5.1 | Grok 3 [Beta] | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | GPT-5.1$1.25 input / $10 output | Grok 3 [Beta]Not available | A complete price comparison is not available. |
| Generation speedtokens per second | GPT-5.1111 tok/s | Grok 3 [Beta]Not available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | GPT-5.157.47 s | Grok 3 [Beta]Not available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | GPT-5.1200K | Grok 3 [Beta]128K | GPT-5.1 lists the larger context window. |
Benchmark Deep Dive
Agentic5 benchmarks
Coding3 benchmarks
Reasoning2 benchmarks
Knowledge6 benchmarks
| Benchmark | GPT-5.1 | Grok 3 [Beta] | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | 36.9% | — | Not comparable |
| AA-GPQA DiamondSource | 87.3% | — | Not comparable |
| AA-HLESource | 26.5% | — | Not comparable |
| AA-Omniscience IndexSource | 5.6% | — | Not comparable |
| AA-Omniscience AccuracySource | 37.6% | — | Not comparable |
| AA-Omniscience Hallucination RateSource | 51.3% | — | Not comparable |
MathGPT-5.1 wins2 benchmarks
Multimodal2 benchmarks
Inst. Following1 benchmarks
| Benchmark | GPT-5.1 | Grok 3 [Beta] | Result |
|---|---|---|---|
| AA-IFBenchSource | 72.9% | — | Not comparable |
Frequently Asked Questions (2)
Which is better, GPT-5.1 or Grok 3 [Beta]?
GPT-5.1 is ahead on BenchLM's BenchAlign leaderboard, 53.65 to 40.43. The biggest single separator in this matchup is FrontierMath v2 (Tiers 1-3), where the scores are 31.034% and 3.793%.
Which is better for math, GPT-5.1 or Grok 3 [Beta]?
GPT-5.1 has the edge for math in this comparison, averaging 26.4 versus 2.8. Inside this category, FrontierMath v2 (Tiers 1-3) is the benchmark that creates the most daylight between them.
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