Model comparison
Gemma 4 31B IT vs GPT-5 Pro
GPT-5 Pro is the stronger model overall, scoring 46.4 to 43.5 on the Noometry Index. Gemma 4 31B IT costs 270× less per token, which makes it the better buy when GPT-5 Pro's lead doesn't matter for your workload.
Last verified . 3 shared benchmarks.
GoogleSummary
- They share 3 benchmarks with published results for both. Gemma 4 31B IT scores higher in 0 categories and GPT-5 Pro in 4 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where GPT-5 Pro leads 56.7 to 37.9.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 63.5% for Gemma 4 31B IT and 76.8% for GPT-5 Pro.
- Gemma 4 31B IT is cheaper at $0.09 / $0.34 per million input/output tokens, against $15 / $120 for GPT-5 Pro.
- GPT-5 Pro accepts more context: 400K tokens versus 262K.
- Gemma 4 31B IT has downloadable open weights; the other is API-only.
Side by side
| Gemma 4 31B IT | GPT-5 Pro | |
|---|---|---|
| Provider | OpenAI | |
| Noometry Index | 43.5 | 46.4 |
| Released | 2026-04-02 | 2025-10-06 |
| Weights | Open | Proprietary |
| Context window | 262K | 400K |
| Max output | 33K | 272K |
| Input $ / M tokens | $0.09 | $15 |
| Output $ / M tokens | $0.34 | $120 |
| Results tracked | 35 | 12 |
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Category by category
Coding GPT-5 Pro leads
Gemma 4 31B IT: 42.3 (#108), GPT-5 Pro: 44.0 (#80)
| Benchmark | Gemma 4 31B IT | GPT-5 Pro |
|---|---|---|
| WeirdML | 52.3% | 60.4% |
| LMArena WebDev | 1366 | — |
| SciCode | 43.4% | — |
| LMArena Coding | 1459 | — |
| ALE-Bench | 925.5 | — |
| AlgoTune | — | 1.31 |
Reasoning GPT-5 Pro leads
Gemma 4 31B IT: 27.2 (#122), GPT-5 Pro: 38.9 (#62)
| Benchmark | Gemma 4 31B IT | GPT-5 Pro |
|---|---|---|
| Kagi LLM Benchmark | 63.5% | 76.8% |
| Epoch Capabilities Index | 142.74 | 150.28 |
| ARC-AGI-2 | — | 18.3% |
| SimpleBench | — | 61.6% |
| NYT Connections (extended) | 70.6% | — |
| ARC-AGI-1 | — | 70.2% |
| CritPt | 1.4% | — |
| Chess Puzzles | 5% | — |
| EnigmaEval | — | 18.8% |
| Thematic Generalization | 53% | — |
| LMArena Hard Prompts | 1448 | — |
| DTBench | 82.7% | — |
| LMCA | 39.3% | — |
| Surface Evolver Bench | 30.6% | — |
Math GPT-5 Pro leads
Gemma 4 31B IT: 43.2 (#81), GPT-5 Pro: 48.5 (#63)
| Benchmark | Gemma 4 31B IT | GPT-5 Pro |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 55.8% |
| FrontierMath Tier 4 | — | 19.5% |
| OTIS Mock AIME 2024-2025 | 73.3% | — |
| LMArena Math | 1465 | — |
| FrontierMath Tier 4 (v1) | — | 14.6% |
Knowledge GPT-5 Pro leads
Gemma 4 31B IT: 37.9 (#151), GPT-5 Pro: 56.7 (#42)
| Benchmark | Gemma 4 31B IT | GPT-5 Pro |
|---|---|---|
| GPQA Diamond | 75.8% | — |
| Humanity's Last Exam | — | 31.6% |
| SimpleQA Verified | 10.4% | — |
| Vectara Hallucination Rate | 7.4% | — |
| LMArena Expert | 1465 | — |
Multimodal Not comparable
Gemma 4 31B IT: 41.6 (#34), GPT-5 Pro: —
| Benchmark | Gemma 4 31B IT | GPT-5 Pro |
|---|---|---|
| LMArena Vision | 1277 | — |
| LMArena Document | 1425 | — |
Multilingual Not comparable
Gemma 4 31B IT: 53.8 (#57), GPT-5 Pro: —
| Benchmark | Gemma 4 31B IT | GPT-5 Pro |
|---|---|---|
| LMArena Non-English | 1431 | — |
| LMArena Chinese | 1476 | — |
| LMArena French | 1435 | — |
| LMArena Russian | 1460 | — |
| LMArena Spanish | 1444 | — |
Instruction Following Not comparable
Gemma 4 31B IT: 75.5 (#61), GPT-5 Pro: —
| Benchmark | Gemma 4 31B IT | GPT-5 Pro |
|---|---|---|
| LMArena Instruction Following | 1433 | — |
Long Context Not comparable
Gemma 4 31B IT: 44.2 (#71), GPT-5 Pro: —
| Benchmark | Gemma 4 31B IT | GPT-5 Pro |
|---|---|---|
| LMArena Longer Query | 1446 | — |
Writing & Preference Not comparable
Gemma 4 31B IT: 60.5 (#96), GPT-5 Pro: —
| Benchmark | Gemma 4 31B IT | GPT-5 Pro |
|---|---|---|
| LMArena Text | 1443 | — |
| LMArena Creative Writing | 1415 | — |
| EQ-Bench Creative Writing | 1368 | — |
| EQ-Bench 4 | 1120 | — |
| LMArena Multi-Turn | 1452 | — |
Frequently asked questions
Is Gemma 4 31B IT better than GPT-5 Pro?
GPT-5 Pro is the stronger model overall, scoring 46.4 to 43.5 on the Noometry Index. Gemma 4 31B IT costs 270× less per token, which makes it the better buy when GPT-5 Pro's lead doesn't matter for your workload.
Which is cheaper, Gemma 4 31B IT or GPT-5 Pro?
Gemma 4 31B IT is cheaper. It lists at $0.09 per million input tokens and $0.34 per million output tokens; GPT-5 Pro lists at $15 and $120.
Is Gemma 4 31B IT or GPT-5 Pro better for coding?
GPT-5 Pro scores higher on coding benchmarks: 44.0 versus 42.3 in the Noometry coding category.
Which has the bigger context window?
GPT-5 Pro does, with 400K tokens against 262K.
How many benchmarks do Gemma 4 31B IT and GPT-5 Pro share?
3 benchmarks have published results for both models. Gemma 4 31B IT has 35 scored results on Noometry and GPT-5 Pro has 12.