Model comparison
Gemini 3.5 Flash vs GPT-5 Nano
Gemini 3.5 Flash is the stronger model overall, scoring 54.2 to 33.5 on the Noometry Index. GPT-5 Nano costs 25× less per token, which makes it the better buy when Gemini 3.5 Flash's lead doesn't matter for your workload.
Last verified . 35 shared benchmarks.
GoogleSummary
- They share 35 benchmarks with published results for both. Gemini 3.5 Flash scores higher in 9 categories and GPT-5 Nano in 1 category; 10 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Gemini 3.5 Flash leads 62.8 to 16.3.
- The biggest single-benchmark swing is ARC-AGI-1: 92.5% for Gemini 3.5 Flash and 20.7% for GPT-5 Nano.
- GPT-5 Nano is cheaper at $0.05 / $0.40 per million input/output tokens, against $1.50 / $9 for Gemini 3.5 Flash.
- Gemini 3.5 Flash accepts more context: 1.05M tokens versus 400K.
Side by side
| Gemini 3.5 Flash | GPT-5 Nano | |
|---|---|---|
| Provider | OpenAI | |
| Noometry Index | 54.2 | 33.5 |
| Released | 2026-05-19 | 2025-08-07 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | 400K |
| Max output | 66K | 128K |
| Input $ / M tokens | $1.50 | $0.05 |
| Output $ / M tokens | $9 | $0.40 |
| Results tracked | 54 | 49 |
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Category by category
Coding Gemini 3.5 Flash leads
Gemini 3.5 Flash: 49.4 (#49), GPT-5 Nano: 33.6 (#254)
| Benchmark | Gemini 3.5 Flash | GPT-5 Nano |
|---|---|---|
| WeirdML | 62.6% | 38.1% |
| LMArena Coding | 1492 | 1351 |
| ALE-Bench | 911.02 | 718.67 |
| SWE-bench Verified | 79.3% | — |
| DeepSWE | 37.4% | — |
| SWE-bench Verified (bash only) | — | 34.8% |
| LMArena WebDev | 1499 | — |
| SciCode | 53.1% | — |
Agentic & Tool Use GPT-5 Nano leads
Gemini 3.5 Flash: 24.7 (#114), GPT-5 Nano: 25.8 (#106)
| Benchmark | Gemini 3.5 Flash | GPT-5 Nano |
|---|---|---|
| Terminal-Bench | — | 21.8% |
| APEX-Agents | 27.5% | — |
| Berkeley Function Calling Leaderboard | — | 51.5% |
| GBAEval | 6.7% | — |
| GDP.pdf | 14% | — |
| Vending-Bench 2 | 5,396 | — |
Reasoning Gemini 3.5 Flash leads
Gemini 3.5 Flash: 62.8 (#18), GPT-5 Nano: 16.3 (#306)
| Benchmark | Gemini 3.5 Flash | GPT-5 Nano |
|---|---|---|
| ARC-AGI-2 | 72.1% | 2.6% |
| ARC-AGI-1 | 92.5% | 20.7% |
| Chess Puzzles | 50% | 27% |
| LMArena Hard Prompts | 1488 | 1328 |
| Mystery Game Puzzles | 32% | 9% |
| DTBench | 94.7% | 62.7% |
| LMCA | 47.1% | 7.9% |
| Epoch Capabilities Index | 154.46 | 139.38 |
| ForecastBench | 59 | 59.1 |
| SimpleBench | 76.7% | — |
| Kagi LLM Benchmark | — | 62.2% |
| NYT Connections (extended) | 92.6% | — |
| CritPt | 13.1% | — |
| EnigmaEval | 25.4% | — |
| EBR-Bench | 4.8% | — |
| Surface Evolver Bench | 58.1% | — |
Math Gemini 3.5 Flash leads
Gemini 3.5 Flash: 60.7 (#36), GPT-5 Nano: 29.4 (#241)
| Benchmark | Gemini 3.5 Flash | GPT-5 Nano |
|---|---|---|
| FrontierMath (Tiers 1-3) | 62.8% | 20% |
| FrontierMath Tier 4 | 26.8% | 2.4% |
| OTIS Mock AIME 2024-2025 | 95.6% | 81.1% |
| ProofBench | 31% | 12% |
| LMArena Math | 1504 | 1317 |
| FrontierMath (Feb 2025 set) | 39% | 8.3% |
| FrontierMath Tier 4 (v1) | 14.6% | 2.1% |
| MathArena Final-Answer Competitions | 76.3% | — |
| Omni-MATH | — | 54.6% |
| MATH Level 5 | — | 95.2% |
Knowledge Gemini 3.5 Flash leads
Gemini 3.5 Flash: 66.3 (#11), GPT-5 Nano: 35.9 (#178)
| Benchmark | Gemini 3.5 Flash | GPT-5 Nano |
|---|---|---|
| GPQA Diamond | 92.8% | 69.4% |
| SimpleQA Verified | 66.2% | 11.7% |
| LMArena Expert | 1495 | 1321 |
| MMLU-Pro | — | 77.8% |
| Vectara Hallucination Rate | — | 10.5% |
| GPQA (HELM) | — | 67.9% |
Multimodal Gemini 3.5 Flash leads
Gemini 3.5 Flash: 45.7 (#15), GPT-5 Nano: 31.3 (#108)
| Benchmark | Gemini 3.5 Flash | GPT-5 Nano |
|---|---|---|
| LMArena Vision | 1310 | 1159 |
| VPCT | — | 37.2% |
| Blueprint-Bench 2 | 33.6% | — |
| LMArena Document | 1463 | — |
Multilingual Gemini 3.5 Flash leads
Gemini 3.5 Flash: 57.0 (#13), GPT-5 Nano: 45.3 (#172)
| Benchmark | Gemini 3.5 Flash | GPT-5 Nano |
|---|---|---|
| LMArena Non-English | 1476 | 1313 |
| LMArena Chinese | 1526 | 1356 |
| LMArena German | 1492 | 1327 |
| LMArena Japanese | 1486 | 1226 |
| LMArena Korean | 1451 | 1269 |
| LMArena Russian | 1493 | 1296 |
| LMArena Spanish | 1480 | 1360 |
| LMArena French | 1490 | — |
Instruction Following Gemini 3.5 Flash leads
Gemini 3.5 Flash: 77.0 (#30), GPT-5 Nano: 75.0 (#79)
| Benchmark | Gemini 3.5 Flash | GPT-5 Nano |
|---|---|---|
| LMArena Instruction Following | 1467 | 1306 |
| IFEval | — | 93.2% |
Long Context Gemini 3.5 Flash leads
Gemini 3.5 Flash: 45.4 (#38), GPT-5 Nano: 31.3 (#281)
| Benchmark | Gemini 3.5 Flash | GPT-5 Nano |
|---|---|---|
| LMArena Longer Query | 1482 | 1312 |
| Fiction.LiveBench | — | 44.4% |
Writing & Preference Gemini 3.5 Flash leads
Gemini 3.5 Flash: 65.5 (#47), GPT-5 Nano: 39.1 (#249)
| Benchmark | Gemini 3.5 Flash | GPT-5 Nano |
|---|---|---|
| LMArena Text | 1482 | 1320 |
| LMArena Creative Writing | 1470 | 1249 |
| LMArena Multi-Turn | 1481 | 1311 |
| EQ-Bench Creative Writing | — | 705 |
| WildBench | — | 80.6% |
| EQ-Bench 4 | 1087 | — |
Frequently asked questions
Is Gemini 3.5 Flash better than GPT-5 Nano?
Gemini 3.5 Flash is the stronger model overall, scoring 54.2 to 33.5 on the Noometry Index. GPT-5 Nano costs 25× less per token, which makes it the better buy when Gemini 3.5 Flash's lead doesn't matter for your workload.
Which is cheaper, Gemini 3.5 Flash or GPT-5 Nano?
GPT-5 Nano is cheaper. It lists at $0.05 per million input tokens and $0.40 per million output tokens; Gemini 3.5 Flash lists at $1.50 and $9.
Is Gemini 3.5 Flash or GPT-5 Nano better for coding?
Gemini 3.5 Flash scores higher on coding benchmarks: 49.4 versus 33.6 in the Noometry coding category.
Which has the bigger context window?
Gemini 3.5 Flash does, with 1.05M tokens against 400K.
How many benchmarks do Gemini 3.5 Flash and GPT-5 Nano share?
35 benchmarks have published results for both models. Gemini 3.5 Flash has 54 scored results on Noometry and GPT-5 Nano has 49.