Gemini 3.1 Pro Preview (02/26) vs GPT 5.4 Mini: Benchmark Comparison
Gemini 3.1 Pro Preview (02/26) has the higher score on 12 of 18 shared benchmarks; GPT 5.4 Mini leads on 3.
The largest observed score gap is 15.94 pts on Vibe Code Bench v1.1 , where GPT 5.4 Mini leads.
Reported ±1 standard-error ranges overlap on 8 of 18 shared benchmarks with comparable uncertainty data. This is not a pairwise statistical significance test.
Shared benchmark results
Scores and reported standard errors come from the latest visible Vals benchmark version available for both models.
| Benchmark | Gemini 3.1 Pro Preview (02/26) | GPT 5.4 Mini | Gap | Reported uncertainty |
|---|---|---|---|---|
| Vals Index | 33.44% ±1.13 | 33.17% ±1.28 | 0.27 pts | Reported ±1 SE ranges overlap |
| Harvey's Legal Agent Benchmark | 0.00% ±0.00 | 0.00% ±0.00 | 0.00 pts | Reported ±1 SE ranges overlap |
| Legal Research Bench | 20.67% ±2.81 | 12.50% ±2.30 | 8.17 pts | Reported ±1 SE ranges do not overlap |
| EMB | 52.62% ±2.97 | 45.43% ±3.65 | 7.19 pts | Reported ±1 SE ranges do not overlap |
| Finance Agent (v2) | 42.98% ±1.21 | 45.36% ±0.45 | 2.38 pts | Reported ±1 SE ranges do not overlap |
| MortgageTax | 69.40% ±0.91 | 63.51% ±0.91 | 5.88 pts | Reported ±1 SE ranges do not overlap |
| Tax Agent Bench | 37.84% ±3.10 | 36.59% ±3.10 | 1.26 pts | Reported ±1 SE ranges overlap |
| TaxEval v2 | 72.88% ±0.86 | 71.22% ±0.90 | 1.66 pts | Reported ±1 SE ranges overlap |
| GPQA Diamond | 95.45% ±1.05 | 83.08% ±2.46 | 12.37 pts | Reported ±1 SE ranges do not overlap |
| MMLU Pro | 90.99% ±0.28 | 84.55% ±0.36 | 6.43 pts | Reported ±1 SE ranges do not overlap |
| MMMU Pro | 88.21% ±0.78 | 79.25% ±0.97 | 8.96 pts | Reported ±1 SE ranges do not overlap |
| SAGE | 48.68% ±3.29 | 50.81% ±3.40 | 2.14 pts | Reported ±1 SE ranges overlap |
| Code Migration | 17.31% ±3.93 | 12.94% ±3.64 | 4.38 pts | Reported ±1 SE ranges overlap |
| LiveCodeBench | 88.48% ±0.93 | 81.47% ±1.09 | 7.02 pts | Reported ±1 SE ranges do not overlap |
| ProgramBench | 0.00% ±0.00 | 0.00% ±0.00 | 0.00 pts | Reported ±1 SE ranges overlap |
| SWE-bench | 78.80% ±1.83 | 73.00% ±1.99 | 5.80 pts | Reported ±1 SE ranges do not overlap |
| Terminal-Bench 4.0 | 2.52% ±0.51 | 2.52% ±1.01 | 0.00 pts | Reported ±1 SE ranges overlap |
| Vibe Code Bench v1.1 | 32.03% ±4.34 | 47.97% ±5.61 | 15.94 pts | Reported ±1 SE ranges do not overlap |
Performance by category
| Category | Gemini 3.1 Pro Preview (02/26) average | GPT 5.4 Mini average |
|---|---|---|
| Legal | 10.34% | 6.25% |
| Finance | 55.14% | 52.42% |
| Academic | 91.55% | 82.29% |
| Education | 48.68% | 50.81% |
| Coding | 36.53% | 36.32% |
Cost and latency
Cost per test appears only where the benchmark reports it for both models. Latency is the measured completion time for that benchmark.
| Benchmark | Gemini 3.1 Pro Preview (02/26) cost | GPT 5.4 Mini cost | Gemini 3.1 Pro Preview (02/26) latency | GPT 5.4 Mini latency |
|---|---|---|---|---|
| Vals Index | $2.18 | $1.45 | 9m52s | 29m49s |
| Harvey's Legal Agent Benchmark | $1.15 | $1.00 | 7m17s | 11m21s |
| Legal Research Bench | $1.10 | $1.86 | 4m02s | 37m36s |
| EMB | $3.77 | $2.15 | 11m49s | 43m21s |
| Finance Agent (v2) | $1.59 | $1.20 | 3m28s | 35m54s |
| MortgageTax | N/A | N/A | 23.62s | 2m06s |
| Tax Agent Bench | $0.30 | $0.81 | 100.96s | 16m46s |
| TaxEval v2 | N/A | N/A | 41.93s | 44.58s |
| GPQA Diamond | N/A | N/A | 65.76s | 63.11s |
| MMLU Pro | N/A | N/A | 23.91s | 20.00s |
| MMMU Pro | N/A | N/A | 76.99s | 50.81s |
| SAGE | N/A | N/A | 61.17s | 2m21s |
| Code Migration | $1.61 | $1.95 | 12m01s | 28m53s |
| LiveCodeBench | N/A | N/A | 88.89s | 3m09s |
| ProgramBench | N/A | N/A | 12m36s | 53m45s |
| SWE-bench | $0.78 | $0.51 | 5m12s | 5m26s |
| Terminal-Bench 4.0 | $4.11 | $1.43 | 18m44s | 29m41s |
| Vibe Code Bench v1.1 | $3.83 | $1.19 | 20m12s | 34m15s |
Results available only for Gemini 3.1 Pro Preview (02/26)
- LegalBench
- MedCode
- MedScribe
- ProofBench v1.1
- BioMysteryBench
- MysteryMechanism
- Terminal-Bench Science
- IOI
- Vibe Code Bench 1-100
- Public Benefits Bench v1.1
Results available only for GPT 5.4 Mini
None.