Model comparison
Gemini 3.1 Pro Preview vs GPT-5.3 Chat
Gemini 3.1 Pro Preview is the stronger model overall, scoring 56.7 to 42.1 on the Noometry Index.
Last verified . 18 shared benchmarks.
GoogleSummary
- They share 18 benchmarks with published results for both. Gemini 3.1 Pro Preview scores higher in 8 categories and GPT-5.3 Chat in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Gemini 3.1 Pro Preview leads 71.7 to 27.3.
- Gemini 3.1 Pro Preview is cheaper at $2 / $12 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Chat.
- Gemini 3.1 Pro Preview accepts more context: 1.05M tokens versus 128K.
Side by side
| Gemini 3.1 Pro Preview | GPT-5.3 Chat | |
|---|---|---|
| Provider | OpenAI | |
| Noometry Index | 56.7 | 42.1 |
| Released | 2026-02-19 | 2026-03-03 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | 128K |
| Max output | 66K | 16K |
| Input $ / M tokens | $2 | $1.75 |
| Output $ / M tokens | $12 | $14 |
| Results tracked | 71 | 18 |
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Category by category
Coding Gemini 3.1 Pro Preview leads
Gemini 3.1 Pro Preview: 42.7 (#88), GPT-5.3 Chat: 40.8 (#124)
| Benchmark | Gemini 3.1 Pro Preview | GPT-5.3 Chat |
|---|---|---|
| LMArena Coding | 1483 | 1408 |
| SWE-bench Verified | 75.6% | — |
| DeepSWE | 11.7% | — |
| LMArena WebDev | 1446 | — |
| SciCode | 58.9% | — |
| GSO | 22.6% | — |
| WeirdML | 72.1% | — |
| MirrorCode | 8.9% | — |
| ALE-Bench | 1,161 | — |
| AlgoTune | 2.02 | — |
Agentic & Tool Use Not comparable
Gemini 3.1 Pro Preview: 37.7 (#33), GPT-5.3 Chat: —
| Benchmark | Gemini 3.1 Pro Preview | GPT-5.3 Chat |
|---|---|---|
| Terminal-Bench | 80.2% | — |
| APEX-Agents | 35.3% | — |
| τ²-bench Banking | 26% | — |
| DeepResearch Bench | 47.8% | — |
| PostTrainBench | 22% | — |
| BALROG | 57% | — |
| ExploitBench | 26.1% | — |
| GBAEval | 0.8% | — |
| GDP.pdf | 17% | — |
| LMArena Search | 1211 | — |
| METR Time Horizons | 77% | — |
| Vending-Bench 2 | 3,774 | — |
Reasoning Gemini 3.1 Pro Preview leads
Gemini 3.1 Pro Preview: 71.7 (#9), GPT-5.3 Chat: 27.3 (#105)
| Benchmark | Gemini 3.1 Pro Preview | GPT-5.3 Chat |
|---|---|---|
| LMArena Hard Prompts | 1484 | 1399 |
| ARC-AGI-2 | 77.1% | — |
| SimpleBench | 79.6% | — |
| NYT Connections (extended) | 97.4% | — |
| ARC-AGI-1 | 98% | — |
| CritPt | 17.7% | — |
| Chess Puzzles | 55% | — |
| EnigmaEval | 36.8% | — |
| Thematic Generalization | 79.4% | — |
| EBR-Bench | 14.3% | — |
| Mystery Game Puzzles | 34% | — |
| DTBench | 97.1% | — |
| LMCA | 53.8% | — |
| Epoch Capabilities Index | 154.92 | — |
| ForecastBench | 59 | — |
Math Gemini 3.1 Pro Preview leads
Gemini 3.1 Pro Preview: 61.8 (#28), GPT-5.3 Chat: 35.4 (#146)
| Benchmark | Gemini 3.1 Pro Preview | GPT-5.3 Chat |
|---|---|---|
| LMArena Math | 1485 | 1389 |
| FrontierMath (Tiers 1-3) | 59.6% | — |
| FrontierMath Tier 4 | 26.8% | — |
| MathArena Final-Answer Competitions | 86.5% | — |
| OTIS Mock AIME 2024-2025 | 95.6% | — |
| ProofBench | 26% | — |
| FrontierMath (Feb 2025 set) | 36.9% | — |
| FrontierMath Tier 4 (v1) | 16.7% | — |
Knowledge Gemini 3.1 Pro Preview leads
Gemini 3.1 Pro Preview: 71.8 (#3), GPT-5.3 Chat: 38.2 (#137)
| Benchmark | Gemini 3.1 Pro Preview | GPT-5.3 Chat |
|---|---|---|
| LMArena Expert | 1484 | 1397 |
| GPQA Diamond | 94.4% | — |
| Humanity's Last Exam | 46.4% | — |
| SimpleQA Verified | 73.5% | — |
| Vectara Hallucination Rate | 10.4% | — |
Multimodal Not comparable
Gemini 3.1 Pro Preview: 38.1 (#60), GPT-5.3 Chat: —
| Benchmark | Gemini 3.1 Pro Preview | GPT-5.3 Chat |
|---|---|---|
| LMArena Vision | 1296 | — |
| Blueprint-Bench 2 | 26.5% | — |
| Furniture Assembly | 26.7% | — |
| LMArena Document | 1444 | — |
Multilingual Gemini 3.1 Pro Preview leads
Gemini 3.1 Pro Preview: 57.1 (#11), GPT-5.3 Chat: 50.5 (#119)
| Benchmark | Gemini 3.1 Pro Preview | GPT-5.3 Chat |
|---|---|---|
| LMArena Non-English | 1475 | 1383 |
| LMArena Chinese | 1528 | 1433 |
| LMArena French | 1488 | 1398 |
| LMArena German | 1491 | 1384 |
| LMArena Japanese | 1494 | 1351 |
| LMArena Korean | 1458 | 1347 |
| LMArena Russian | 1496 | 1400 |
| LMArena Spanish | 1480 | 1371 |
Instruction Following Gemini 3.1 Pro Preview leads
Gemini 3.1 Pro Preview: 77.1 (#31), GPT-5.3 Chat: 73.0 (#124)
| Benchmark | Gemini 3.1 Pro Preview | GPT-5.3 Chat |
|---|---|---|
| LMArena Instruction Following | 1465 | 1378 |
Long Context Gemini 3.1 Pro Preview leads
Gemini 3.1 Pro Preview: 47.3 (#17), GPT-5.3 Chat: 42.6 (#115)
| Benchmark | Gemini 3.1 Pro Preview | GPT-5.3 Chat |
|---|---|---|
| LMArena Longer Query | 1482 | 1396 |
| CL-bench | 20.8% | — |
| CL-bench Life | 16.9% | — |
Writing & Preference Gemini 3.1 Pro Preview leads
Gemini 3.1 Pro Preview: 66.3 (#36), GPT-5.3 Chat: 63.3 (#65)
| Benchmark | Gemini 3.1 Pro Preview | GPT-5.3 Chat |
|---|---|---|
| LMArena Text | 1480 | 1389 |
| LMArena Creative Writing | 1482 | 1356 |
| EQ-Bench Creative Writing | 1491 | 1690 |
| LMArena Multi-Turn | 1486 | 1413 |
| EQ-Bench 4 | 1142 | — |
Frequently asked questions
Is Gemini 3.1 Pro Preview better than GPT-5.3 Chat?
Gemini 3.1 Pro Preview is the stronger model overall, scoring 56.7 to 42.1 on the Noometry Index.
Which is cheaper, Gemini 3.1 Pro Preview or GPT-5.3 Chat?
Gemini 3.1 Pro Preview is cheaper. It lists at $2 per million input tokens and $12 per million output tokens; GPT-5.3 Chat lists at $1.75 and $14.
Is Gemini 3.1 Pro Preview or GPT-5.3 Chat better for coding?
Gemini 3.1 Pro Preview scores higher on coding benchmarks: 42.7 versus 40.8 in the Noometry coding category.
Which has the bigger context window?
Gemini 3.1 Pro Preview does, with 1.05M tokens against 128K.
How many benchmarks do Gemini 3.1 Pro Preview and GPT-5.3 Chat share?
18 benchmarks have published results for both models. Gemini 3.1 Pro Preview has 71 scored results on Noometry and GPT-5.3 Chat has 18.