Model comparison
GPT-5.1 vs GPT-5.4 Pro
Head-to-head evidence from 3 shared benchmark results across 2 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: GPT-5.1 #94 (Estimated); GPT-5.4 Pro #44 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. GPT-5.1 and GPT-5.4 Pro share 3 comparable benchmark results. 1 of 8 categories are comparable. 18 results are unique to GPT-5.1; 9 to GPT-5.4 Pro.
Updated July 23, 2026- Shared results
- 3
- GPT-5.1 only
- 18
- GPT-5.4 Pro only
- 9
- Comparable categories
- 1 / 8
Pick GPT-5.4 Pro if you want the stronger benchmark profile. GPT-5.1 only becomes the better choice if you want the cheaper token bill.
Confidence note. This is a partial-evidence comparison with 3 shared benchmark results across 2 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-5.4 Pro is clearly ahead on the BenchAlign aggregate, 60.89 to 53.65. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
GPT-5.4 Pro's sharpest advantage is in mathematics, where it averages 46.9 against 26.4. The single biggest benchmark swing on the page is FrontierMath v2 (Tier 4), 12.500% to 37.500%.
GPT-5.4 Pro is also the more expensive model on tokens at $30.00 input / $180.00 output per 1M tokens, versus $1.25 input / $10.00 output per 1M tokens for GPT-5.1. That is roughly 18.0x on output cost alone. GPT-5.4 Pro gives you the larger context window at 1.05M, compared with 200K for GPT-5.1.
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 | GPT-5.4 Pro |
|---|---|---|---|
| Math | GPT-5.126.4 | Margin→ 20.5 | GPT-5.4 Pro46.9 |
| Agentic | GPT-5.1Not measured | MarginNo overlap | GPT-5.4 Pro89.3 |
| Reasoning | GPT-5.1Not measured | MarginNo overlap | GPT-5.4 Pro83.3 |
| Knowledge | GPT-5.1Not measured | MarginNo overlap | GPT-5.4 Pro58.7 |
| Multimodal | GPT-5.1Not measured | MarginNo overlap | GPT-5.4 Pro94.0 |
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 37.500%Winner: GPT-5.4 ProΔ 25FrontierMath v2 (Tier 4): GPT-5.1 scored 12.500%; GPT-5.4 Pro scored 37.500%. GPT-5.4 Pro wins this benchmark. - Source ↗
FrontierMath v2 (Tiers 1-3)
MathA 31.034%B 50.000%Winner: GPT-5.4 ProΔ 19FrontierMath v2 (Tiers 1-3): GPT-5.1 scored 31.034%; GPT-5.4 Pro scored 50.000%. GPT-5.4 Pro wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | GPT-5.1 | GPT-5.4 Pro | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | GPT-5.1$1.25 input / $10 output | GPT-5.4 Pro$30 input / $180 output | GPT-5.1 has the lower combined listed price. |
| Generation speedtokens per second | GPT-5.1111 tok/s | GPT-5.4 Pro74 tok/s | GPT-5.1 has the higher measured throughput. |
| First-answer latencyseconds to first token | GPT-5.157.47 s | GPT-5.4 Pro151.79 s | GPT-5.1 reaches the first token sooner. |
| Context windowmaximum listed tokens | GPT-5.1200K | GPT-5.4 Pro1.05M | GPT-5.4 Pro lists the larger context window. |
Benchmark Deep Dive
Agentic6 benchmarks
Coding3 benchmarks
Reasoning3 benchmarks
Knowledge10 benchmarks
| Benchmark | GPT-5.1 | GPT-5.4 Pro | 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 |
| HLESource | — | 58.7% | Not comparable |
| FrontierScienceSource | — | 36.7% | Not comparable |
| FrontierScience ResearchSource | — | 36.7% | Not comparable |
| HLE w/o toolsSource | — | 42.7% | Not comparable |
MathGPT-5.4 Pro wins4 benchmarks
Multimodal3 benchmarks
Inst. Following1 benchmarks
| Benchmark | GPT-5.1 | GPT-5.4 Pro | Result |
|---|---|---|---|
| AA-IFBenchSource | 72.9% | — | Not comparable |
Frequently Asked Questions (2)
Which is better, GPT-5.1 or GPT-5.4 Pro?
GPT-5.4 Pro is ahead on BenchLM's BenchAlign leaderboard, 60.89 to 53.65. The biggest single separator in this matchup is FrontierMath v2 (Tier 4), where the scores are 12.500% and 37.500%.
Which is better for math, GPT-5.1 or GPT-5.4 Pro?
GPT-5.4 Pro has the edge for math in this comparison, averaging 46.9 versus 26.4. Inside this category, FrontierMath v2 (Tier 4) is the benchmark that creates the most daylight between them.
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