Model comparison
Gemini 2.5 Pro vs GPT-5 Nano
Gemini 2.5 Pro is the stronger model overall, scoring 44.9 to 33.4 on the Noometry Index. GPT-5 Nano costs 25× less per token, which makes it the better buy when Gemini 2.5 Pro's lead doesn't matter for your workload.
Last verified . 44 shared benchmarks.
GoogleSummary
- They share 44 benchmarks with published results for both. Gemini 2.5 Pro scores higher in 10 categories and GPT-5 Nano in 0 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in long context, where Gemini 2.5 Pro leads 59.7 to 31.3.
- The biggest single-benchmark swing is Fiction.LiveBench: 91.7% for Gemini 2.5 Pro and 44.4% for GPT-5 Nano.
- GPT-5 Nano is cheaper at $0.05 / $0.40 per million input/output tokens, against $1.25 / $10 for Gemini 2.5 Pro.
- Gemini 2.5 Pro accepts more context: 1.05M tokens versus 400K.
Side by side
| Gemini 2.5 Pro | GPT-5 Nano | |
|---|---|---|
| Provider | OpenAI | |
| Noometry Index | 44.9 | 33.4 |
| Released | 2025-03-25 | 2025-08-07 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | 400K |
| Max output | 66K | 128K |
| Input $ / M tokens | $1.25 | $0.05 |
| Output $ / M tokens | $10 | $0.40 |
| Results tracked | 78 | 48 |
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Category by category
Coding Gemini 2.5 Pro leads
Gemini 2.5 Pro: 42.8 (#86), GPT-5 Nano: 33.3 (#248)
| Benchmark | Gemini 2.5 Pro | GPT-5 Nano |
|---|---|---|
| SWE-bench Verified (bash only) | 53.6% | 34.8% |
| WeirdML | 54% | 38.1% |
| LMArena Coding | 1452 | 1351 |
| ALE-Bench | 785.52 | 718.67 |
| SWE-bench Verified | 57.6% | — |
| Aider Polyglot | 83.1% | — |
| LMArena WebDev | 1227 | — |
| SciCode | 42.8% | — |
| GSO | 3.9% | — |
| LiveBench Coding | 85.9% | — |
| CadEval | 64% | — |
| AlgoTune | 1.51 | — |
Agentic & Tool Use Gemini 2.5 Pro leads
Gemini 2.5 Pro: 29.1 (#81), GPT-5 Nano: 25.6 (#99)
| Benchmark | Gemini 2.5 Pro | GPT-5 Nano |
|---|---|---|
| Terminal-Bench | 32.6% | 21.8% |
| Berkeley Function Calling Leaderboard | — | 51.5% |
| GDPval | 23.3% | — |
| Remote Labor Index | 0.8% | — |
| TheAgentCompany | 30.3% | — |
| τ²-bench Banking | 13.7% | — |
| DeepResearch Bench | 42.8% | — |
| BALROG | 43.3% | — |
| LMArena Search | 1142 | — |
| METR Time Horizons | 55.4% | — |
| Vending-Bench 2 | 573.64 | — |
Reasoning Gemini 2.5 Pro leads
Gemini 2.5 Pro: 28.8 (#85), GPT-5 Nano: 16.4 (#291)
| Benchmark | Gemini 2.5 Pro | GPT-5 Nano |
|---|---|---|
| ARC-AGI-2 | 4.9% | 2.6% |
| Kagi LLM Benchmark | 70.3% | 62.2% |
| ARC-AGI-1 | 41% | 20.7% |
| Chess Puzzles | 20% | 27% |
| LMArena Hard Prompts | 1455 | 1329 |
| DTBench | 82.4% | 62.7% |
| LMCA | 34.8% | 7.9% |
| Epoch Capabilities Index | 145.32 | 139.39 |
| ForecastBench | 61.3 | 59.1 |
| SimpleBench | 62.4% | — |
| CritPt | 2% | — |
| EnigmaEval | 5.6% | — |
| LiveBench Reasoning | 89.8% | — |
| Mystery Game Puzzles | — | 9% |
| LiveBench Data Analysis | 79.9% | — |
| LiveBench | 82.3% | — |
Math Gemini 2.5 Pro leads
Gemini 2.5 Pro: 31.9 (#191), GPT-5 Nano: 29.1 (#221)
| Benchmark | Gemini 2.5 Pro | GPT-5 Nano |
|---|---|---|
| FrontierMath (Tiers 1-3) | 24.6% | 20% |
| FrontierMath Tier 4 | 0% | 2.4% |
| OTIS Mock AIME 2024-2025 | 84.7% | 81.1% |
| Omni-MATH | 41.6% | 54.6% |
| LMArena Math | 1450 | 1318 |
| MATH Level 5 | 95.9% | 95.2% |
| FrontierMath (Feb 2025 set) | 14.1% | 8.3% |
| FrontierMath Tier 4 (v1) | 4.2% | 2.1% |
| ProofBench | — | 12% |
| LiveBench Math | 90.2% | — |
Knowledge Gemini 2.5 Pro leads
Gemini 2.5 Pro: 55.8 (#41), GPT-5 Nano: 35.8 (#166)
| Benchmark | Gemini 2.5 Pro | GPT-5 Nano |
|---|---|---|
| GPQA Diamond | 85.3% | 69.4% |
| MMLU-Pro | 86.3% | 77.8% |
| Vectara Hallucination Rate | 7% | 10.5% |
| GPQA (HELM) | 74.9% | 67.9% |
| LMArena Expert | 1452 | 1321 |
| Humanity's Last Exam | 21.6% | — |
| SimpleQA Verified | — | 11.7% |
| Confabulations | 10.6% | — |
Multimodal Gemini 2.5 Pro leads
Gemini 2.5 Pro: 44.5 (#16), GPT-5 Nano: 30.7 (#102)
| Benchmark | Gemini 2.5 Pro | GPT-5 Nano |
|---|---|---|
| LMArena Vision | 1263 | 1159 |
| VPCT | 48% | 37.2% |
| GeoBench | 86% | — |
| LMArena Document | 1421 | — |
| SpatialViz-Bench | 44.7% | — |
Multilingual Gemini 2.5 Pro leads
Gemini 2.5 Pro: 55.5 (#30), GPT-5 Nano: 45.5 (#167)
| Benchmark | Gemini 2.5 Pro | GPT-5 Nano |
|---|---|---|
| LMArena Non-English | 1452 | 1313 |
| LMArena Chinese | 1507 | 1355 |
| LMArena German | 1487 | 1329 |
| LMArena Korean | 1435 | 1269 |
| LMArena Russian | 1460 | 1296 |
| LMArena Spanish | 1473 | 1360 |
| LMArena French | 1473 | — |
| LMArena Japanese | 1462 | — |
Instruction Following Too close to call
Gemini 2.5 Pro: 75.2 (#71), GPT-5 Nano: 75.2 (#72)
| Benchmark | Gemini 2.5 Pro | GPT-5 Nano |
|---|---|---|
| IFEval | 84% | 93.2% |
| LMArena Instruction Following | 1436 | 1306 |
| LiveBench Instruction Following | 80.6% | — |
Long Context Gemini 2.5 Pro leads
Gemini 2.5 Pro: 59.7 (#5), GPT-5 Nano: 31.3 (#275)
| Benchmark | Gemini 2.5 Pro | GPT-5 Nano |
|---|---|---|
| Fiction.LiveBench | 91.7% | 44.4% |
| LMArena Longer Query | 1449 | 1313 |
Writing & Preference Gemini 2.5 Pro leads
Gemini 2.5 Pro: 63.9 (#60), GPT-5 Nano: 39.4 (#244)
| Benchmark | Gemini 2.5 Pro | GPT-5 Nano |
|---|---|---|
| LMArena Text | 1458 | 1320 |
| LMArena Creative Writing | 1453 | 1250 |
| EQ-Bench Creative Writing | 1421 | 705 |
| WildBench | 85.7% | 80.6% |
| LMArena Multi-Turn | 1453 | 1311 |
| Short-Story Creative Writing | 83.8% | — |
| LiveBench Language | 67.8% | — |
Frequently asked questions
Is Gemini 2.5 Pro better than GPT-5 Nano?
Gemini 2.5 Pro is the stronger model overall, scoring 44.9 to 33.4 on the Noometry Index. GPT-5 Nano costs 25× less per token, which makes it the better buy when Gemini 2.5 Pro's lead doesn't matter for your workload.
Which is cheaper, Gemini 2.5 Pro 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 2.5 Pro lists at $1.25 and $10.
Is Gemini 2.5 Pro or GPT-5 Nano better for coding?
Gemini 2.5 Pro scores higher on coding benchmarks: 42.8 versus 33.3 in the Noometry coding category.
Which has the bigger context window?
Gemini 2.5 Pro does, with 1.05M tokens against 400K.
How many benchmarks do Gemini 2.5 Pro and GPT-5 Nano share?
44 benchmarks have published results for both models. Gemini 2.5 Pro has 78 scored results on Noometry and GPT-5 Nano has 48.