Model comparison
Gemma 4 31B IT vs GPT-5.5 Pro
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 43.5 on the Noometry Index. Gemma 4 31B IT costs 443× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.
Last verified . 7 shared benchmarks.
GoogleSummary
- They share 7 benchmarks with published results for both. Gemma 4 31B IT scores higher in 0 categories and GPT-5.5 Pro in 3 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5.5 Pro leads 73.3 to 27.2.
- The biggest single-benchmark swing is Chess Puzzles: 5% for Gemma 4 31B IT and 64% for GPT-5.5 Pro.
- Gemma 4 31B IT is cheaper at $0.09 / $0.34 per million input/output tokens, against $30 / $180 for GPT-5.5 Pro.
- GPT-5.5 Pro accepts more context: 1.05M tokens versus 262K.
- Gemma 4 31B IT has downloadable open weights; the other is API-only.
Side by side
| Gemma 4 31B IT | GPT-5.5 Pro | |
|---|---|---|
| Provider | OpenAI | |
| Noometry Index | 43.5 | 64.3 |
| Released | 2026-04-02 | 2026-04-23 |
| Weights | Open | Proprietary |
| Context window | 262K | 1.05M |
| Max output | 33K | 128K |
| Input $ / M tokens | $0.09 | $30 |
| Output $ / M tokens | $0.34 | $180 |
| Results tracked | 35 | 14 |
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Category by category
Coding Not comparable
Gemma 4 31B IT: 42.3 (#108), GPT-5.5 Pro: —
| Benchmark | Gemma 4 31B IT | GPT-5.5 Pro |
|---|---|---|
| LMArena WebDev | 1366 | — |
| SciCode | 43.4% | — |
| WeirdML | 52.3% | — |
| LMArena Coding | 1459 | — |
| ALE-Bench | 925.5 | — |
Reasoning GPT-5.5 Pro leads
Gemma 4 31B IT: 27.2 (#122), GPT-5.5 Pro: 73.3 (#10)
| Benchmark | Gemma 4 31B IT | GPT-5.5 Pro |
|---|---|---|
| CritPt | 1.4% | 30.6% |
| Chess Puzzles | 5% | 64% |
| DTBench | 82.7% | 96% |
| LMCA | 39.3% | 53.9% |
| Epoch Capabilities Index | 142.74 | 162.07 |
| ARC-AGI-2 | — | 84.6% |
| SimpleBench | — | 76.9% |
| Kagi LLM Benchmark | 63.5% | — |
| NYT Connections (extended) | 70.6% | — |
| ARC-AGI-1 | — | 96.5% |
| Thematic Generalization | 53% | — |
| LMArena Hard Prompts | 1448 | — |
| Surface Evolver Bench | 30.6% | — |
Math GPT-5.5 Pro leads
Gemma 4 31B IT: 43.2 (#81), GPT-5.5 Pro: 84.0 (#10)
| Benchmark | Gemma 4 31B IT | GPT-5.5 Pro |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 73.3% | 100% |
| FrontierMath (Tiers 1-3) | — | 87.7% |
| FrontierMath Tier 4 | — | 78% |
| LMArena Math | 1465 | — |
| FrontierMath (Feb 2025 set) | — | 52.4% |
| FrontierMath Tier 4 (v1) | — | 39.6% |
Knowledge GPT-5.5 Pro leads
Gemma 4 31B IT: 37.9 (#151), GPT-5.5 Pro: 64.1 (#19)
| Benchmark | Gemma 4 31B IT | GPT-5.5 Pro |
|---|---|---|
| GPQA Diamond | 75.8% | 93.9% |
| SimpleQA Verified | 10.4% | — |
| Vectara Hallucination Rate | 7.4% | — |
| LMArena Expert | 1465 | — |
Multimodal Not comparable
Gemma 4 31B IT: 41.6 (#34), GPT-5.5 Pro: —
| Benchmark | Gemma 4 31B IT | GPT-5.5 Pro |
|---|---|---|
| LMArena Vision | 1277 | — |
| LMArena Document | 1425 | — |
Multilingual Not comparable
Gemma 4 31B IT: 53.8 (#57), GPT-5.5 Pro: —
| Benchmark | Gemma 4 31B IT | GPT-5.5 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-5.5 Pro: —
| Benchmark | Gemma 4 31B IT | GPT-5.5 Pro |
|---|---|---|
| LMArena Instruction Following | 1433 | — |
Long Context Not comparable
Gemma 4 31B IT: 44.2 (#71), GPT-5.5 Pro: —
| Benchmark | Gemma 4 31B IT | GPT-5.5 Pro |
|---|---|---|
| LMArena Longer Query | 1446 | — |
Writing & Preference Not comparable
Gemma 4 31B IT: 60.5 (#96), GPT-5.5 Pro: —
| Benchmark | Gemma 4 31B IT | GPT-5.5 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-5.5 Pro?
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 43.5 on the Noometry Index. Gemma 4 31B IT costs 443× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.
Which is cheaper, Gemma 4 31B IT or GPT-5.5 Pro?
Gemma 4 31B IT is cheaper. It lists at $0.09 per million input tokens and $0.34 per million output tokens; GPT-5.5 Pro lists at $30 and $180.
Which has the bigger context window?
GPT-5.5 Pro does, with 1.05M tokens against 262K.
How many benchmarks do Gemma 4 31B IT and GPT-5.5 Pro share?
7 benchmarks have published results for both models. Gemma 4 31B IT has 35 scored results on Noometry and GPT-5.5 Pro has 14.