Model comparison
Gemini 3 Flash Preview vs GPT-5.3 Chat
Gemini 3 Flash Preview is the stronger model overall, scoring 52.3 to 42.8 on the Noometry Index.
Last verified . 17 shared benchmarks.
GoogleSummary
- They share 17 benchmarks with published results for both. Gemini 3 Flash 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 Flash Preview leads 49.2 to 28.5.
- Gemini 3 Flash Preview is cheaper at $0.50 / $3 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Chat.
- Gemini 3 Flash Preview accepts more context: 1.05M tokens versus 128K.
Side by side
| Gemini 3 Flash Preview | GPT-5.3 Chat | |
|---|---|---|
| Provider | OpenAI | |
| Noometry Index | 52.3 | 42.8 |
| Released | 2025-12-17 | 2026-03-03 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | 128K |
| Max output | 66K | 16K |
| Input $ / M tokens | $0.50 | $1.75 |
| Output $ / M tokens | $3 | $14 |
| Results tracked | 59 | 18 |
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Category by category
Coding Gemini 3 Flash Preview leads
Gemini 3 Flash Preview: 50.9 (#42), GPT-5.3 Chat: 41.4 (#124)
| Benchmark | Gemini 3 Flash Preview | GPT-5.3 Chat |
|---|---|---|
| LMArena Coding | 1460 | 1408 |
| SWE-bench Verified | 75.4% | — |
| SWE-bench Verified (bash only) | 75.8% | — |
| LMArena WebDev | 1439 | — |
| SWE-bench Multilingual | 72.7% | — |
| GSO | 9.8% | — |
| WeirdML | 61.6% | — |
| ALE-Bench | 1,367 | — |
Agentic & Tool Use Not comparable
Gemini 3 Flash Preview: 38.7 (#29), GPT-5.3 Chat: —
| Benchmark | Gemini 3 Flash Preview | GPT-5.3 Chat |
|---|---|---|
| Terminal-Bench | 64.3% | — |
| τ²-bench Airline | 82.5% | — |
| τ²-bench Banking | 27.3% | — |
| τ²-bench Retail | 76.8% | — |
| τ²-bench Telecom | 91.2% | — |
| DeepResearch Bench | 49.8% | — |
| BALROG | 48.1% | — |
| GDP.pdf | 10% | — |
| LMArena Search | 1198 | — |
| Vending-Bench 2 | 3,635 | — |
Reasoning Gemini 3 Flash Preview leads
Gemini 3 Flash Preview: 49.2 (#37), GPT-5.3 Chat: 28.5 (#102)
| Benchmark | Gemini 3 Flash Preview | GPT-5.3 Chat |
|---|---|---|
| LMArena Hard Prompts | 1465 | 1399 |
| ARC-AGI-2 | 33.6% | — |
| SimpleBench | 61.1% | — |
| NYT Connections (extended) | 83.1% | — |
| ARC-AGI-1 | 84.7% | — |
| Chess Puzzles | 40% | — |
| Mystery Game Puzzles | 26% | — |
| DTBench | 89.1% | — |
| LMCA | 43.1% | — |
| Epoch Capabilities Index | 151.8 | — |
| ForecastBench | 58.5 | — |
Math Gemini 3 Flash Preview leads
Gemini 3 Flash Preview: 51.7 (#55), GPT-5.3 Chat: 38.2 (#142)
| Benchmark | Gemini 3 Flash Preview | GPT-5.3 Chat |
|---|---|---|
| LMArena Math | 1473 | 1389 |
| FrontierMath (Tiers 1-3) | 51.2% | — |
| FrontierMath Tier 4 | 17.1% | — |
| MathArena Final-Answer Competitions | 67.6% | — |
| OTIS Mock AIME 2024-2025 | 95.6% | — |
| ProofBench | 15% | — |
| FrontierMath (Feb 2025 set) | 35.6% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Gemini 3 Flash Preview leads
Gemini 3 Flash Preview: 58.8 (#33), GPT-5.3 Chat: 38.8 (#140)
| Benchmark | Gemini 3 Flash Preview | GPT-5.3 Chat |
|---|---|---|
| LMArena Expert | 1462 | 1397 |
| GPQA Diamond | 89.4% | — |
| SimpleQA Verified | 66.8% | — |
| Vectara Hallucination Rate | 13.5% | — |
Multimodal Not comparable
Gemini 3 Flash Preview: 45.5 (#16), GPT-5.3 Chat: —
| Benchmark | Gemini 3 Flash Preview | GPT-5.3 Chat |
|---|---|---|
| LMArena Vision | 1285 | — |
| GeoBench | 88% | — |
| VPCT | 72.6% | — |
| Blueprint-Bench 2 | 0% | — |
| LMArena Document | 1413 | — |
Multilingual Gemini 3 Flash Preview leads
Gemini 3 Flash Preview: 55.7 (#27), GPT-5.3 Chat: 50.3 (#124)
| Benchmark | Gemini 3 Flash Preview | GPT-5.3 Chat |
|---|---|---|
| LMArena Non-English | 1458 | 1382 |
| LMArena Chinese | 1511 | 1432 |
| LMArena French | 1477 | 1397 |
| LMArena German | 1497 | 1384 |
| LMArena Japanese | 1489 | 1352 |
| LMArena Korean | 1443 | 1346 |
| LMArena Russian | 1480 | 1400 |
| LMArena Spanish | 1469 | 1371 |
Instruction Following Gemini 3 Flash Preview leads
Gemini 3 Flash Preview: 75.7 (#56), GPT-5.3 Chat: 72.8 (#129)
| Benchmark | Gemini 3 Flash Preview | GPT-5.3 Chat |
|---|---|---|
| LMArena Instruction Following | 1437 | 1378 |
Long Context Gemini 3 Flash Preview leads
Gemini 3 Flash Preview: 44.4 (#67), GPT-5.3 Chat: 42.6 (#120)
| Benchmark | Gemini 3 Flash Preview | GPT-5.3 Chat |
|---|---|---|
| LMArena Longer Query | 1452 | 1396 |
Writing & Preference Gemini 3 Flash Preview leads
Gemini 3 Flash Preview: 65.5 (#45), GPT-5.3 Chat: 63.1 (#68)
| Benchmark | Gemini 3 Flash Preview | GPT-5.3 Chat |
|---|---|---|
| LMArena Text | 1466 | 1389 |
| LMArena Creative Writing | 1457 | 1355 |
| LMArena Multi-Turn | 1471 | 1412 |
| EQ-Bench Creative Writing | — | 1690 |
Frequently asked questions
Is Gemini 3 Flash Preview better than GPT-5.3 Chat?
Gemini 3 Flash Preview is the stronger model overall, scoring 52.3 to 42.8 on the Noometry Index.
Which is cheaper, Gemini 3 Flash Preview or GPT-5.3 Chat?
Gemini 3 Flash Preview is cheaper. It lists at $0.50 per million input tokens and $3 per million output tokens; GPT-5.3 Chat lists at $1.75 and $14.
Is Gemini 3 Flash Preview or GPT-5.3 Chat better for coding?
Gemini 3 Flash Preview scores higher on coding benchmarks: 50.9 versus 41.4 in the Noometry coding category.
Which has the bigger context window?
Gemini 3 Flash Preview does, with 1.05M tokens against 128K.
How many benchmarks do Gemini 3 Flash Preview and GPT-5.3 Chat share?
17 benchmarks have published results for both models. Gemini 3 Flash Preview has 59 scored results on Noometry and GPT-5.3 Chat has 18.