Model comparison
GPT-5.1 vs o4-mini (high)
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); o4-mini (high) #118 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. GPT-5.1 and o4-mini (high) share 2 comparable benchmark results. 1 of 8 categories are comparable. 19 results are unique to GPT-5.1; 0 to o4-mini (high).
Updated July 20, 2026- Shared results
- 2
- GPT-5.1 only
- 19
- o4-mini (high) only
- 0
- Comparable categories
- 1 / 8
Pick GPT-5.1 if you want the stronger benchmark profile. o4-mini (high) 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 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 49.98. 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 20.2. The single biggest benchmark swing on the page is FrontierMath v2 (Tier 4), 12.500% to 6.250%.
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 | o4-mini (high) |
|---|---|---|---|
| Math | GPT-5.126.4 | Margin← 6.2 | o4-mini (high)20.2 |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
FrontierMath v2 (Tier 4)
MathA 12.500%B 6.250%Winner: GPT-5.1Δ 6.3FrontierMath v2 (Tier 4): GPT-5.1 scored 12.500%; o4-mini (high) scored 6.250%. GPT-5.1 wins this benchmark. - Source ↗
FrontierMath v2 (Tiers 1-3)
MathA 31.034%B 24.828%Winner: GPT-5.1Δ 6.2FrontierMath v2 (Tiers 1-3): GPT-5.1 scored 31.034%; o4-mini (high) scored 24.828%. 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 | o4-mini (high) | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | GPT-5.1$1.25 input / $10 output | o4-mini (high)Not available | A complete price comparison is not available. |
| Generation speedtokens per second | GPT-5.1111 tok/s | o4-mini (high)161 tok/s | o4-mini (high) has the higher measured throughput. |
| First-answer latencyseconds to first token | GPT-5.157.47 s | o4-mini (high)21.94 s | o4-mini (high) reaches the first token sooner. |
| Context windowmaximum listed tokens | GPT-5.1200K | o4-mini (high)200K | Listed context windows are equal. |
Benchmark Deep Dive
Agentic5 benchmarks
Coding3 benchmarks
Reasoning2 benchmarks
Knowledge6 benchmarks
| Benchmark | GPT-5.1 | o4-mini (high) | 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 | o4-mini (high) | Result |
|---|---|---|---|
| AA-IFBenchSource | 72.9% | — | Not comparable |
Frequently Asked Questions (2)
Which is better, GPT-5.1 or o4-mini (high)?
GPT-5.1 is ahead on BenchLM's BenchAlign leaderboard, 53.65 to 49.98. The biggest single separator in this matchup is FrontierMath v2 (Tier 4), where the scores are 12.500% and 6.250%.
Which is better for math, GPT-5.1 or o4-mini (high)?
GPT-5.1 has the edge for math in this comparison, averaging 26.4 versus 20.2. Inside this category, FrontierMath v2 (Tier 4) is the benchmark that creates the most daylight between them.
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