Model comparison
GPT-5 Nano vs Grok 3
Grok 3 is the stronger model overall, scoring 39.9 to 33.5 on the Noometry Index.
Last verified . 34 shared benchmarks.
Summary
- They share 34 benchmarks with published results for both. GPT-5 Nano scores higher in 1 category and Grok 3 in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Grok 3 leads 55.8 to 39.1.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 81.1% for GPT-5 Nano and 55.6% for Grok 3.
Side by side
| GPT-5 Nano | Grok 3 | |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 33.5 | 39.9 |
| Released | 2025-08-07 | 2025-04-09 |
| Weights | Proprietary | Proprietary |
| Context window | 400K | — |
| Max output | 128K | — |
| Input $ / M tokens | $0.05 | — |
| Output $ / M tokens | $0.40 | — |
| Results tracked | 49 | 40 |
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Category by category
Coding Grok 3 leads
GPT-5 Nano: 33.6 (#254), Grok 3: 41.9 (#115)
| Benchmark | GPT-5 Nano | Grok 3 |
|---|---|---|
| WeirdML | 38.1% | 37.2% |
| LMArena Coding | 1351 | 1432 |
| SWE-bench Verified (bash only) | 34.8% | — |
| Aider Polyglot | — | 53.3% |
| ALE-Bench | 718.67 | — |
Agentic & Tool Use Grok 3 leads
GPT-5 Nano: 25.8 (#106), Grok 3: 30.5 (#76)
| Benchmark | GPT-5 Nano | Grok 3 |
|---|---|---|
| Terminal-Bench | 21.8% | — |
| Berkeley Function Calling Leaderboard | 51.5% | — |
| BALROG | — | 29.5% |
Reasoning GPT-5 Nano leads
GPT-5 Nano: 16.3 (#306), Grok 3: 13.7 (#333)
| Benchmark | GPT-5 Nano | Grok 3 |
|---|---|---|
| ARC-AGI-2 | 2.6% | 0% |
| Kagi LLM Benchmark | 62.2% | 61.3% |
| ARC-AGI-1 | 20.7% | 5.5% |
| LMArena Hard Prompts | 1328 | 1434 |
| Epoch Capabilities Index | 139.38 | 138.33 |
| SimpleBench | — | 36.1% |
| Chess Puzzles | 27% | — |
| Mystery Game Puzzles | 9% | — |
| DTBench | 62.7% | — |
| LMCA | 7.9% | — |
| ForecastBench | 59.1 | — |
Math Grok 3 leads
GPT-5 Nano: 29.4 (#241), Grok 3: 38.0 (#145)
| Benchmark | GPT-5 Nano | Grok 3 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 81.1% | 55.6% |
| Omni-MATH | 54.6% | 46.4% |
| LMArena Math | 1317 | 1391 |
| MATH Level 5 | 95.2% | 88.7% |
| FrontierMath (Feb 2025 set) | 8.3% | 3.8% |
| FrontierMath Tier 4 (v1) | 2.1% | 0% |
| FrontierMath (Tiers 1-3) | 20% | — |
| FrontierMath Tier 4 | 2.4% | — |
| ProofBench | 12% | — |
Knowledge Grok 3 leads
GPT-5 Nano: 35.9 (#178), Grok 3: 46.2 (#82)
| Benchmark | GPT-5 Nano | Grok 3 |
|---|---|---|
| GPQA Diamond | 69.4% | 75.8% |
| MMLU-Pro | 77.8% | 78.8% |
| Vectara Hallucination Rate | 10.5% | 5.8% |
| GPQA (HELM) | 67.9% | 65% |
| LMArena Expert | 1321 | 1421 |
| SimpleQA Verified | 11.7% | — |
| Confabulations | — | 14.2% |
Multimodal Not comparable
GPT-5 Nano: 31.3 (#108), Grok 3: —
| Benchmark | GPT-5 Nano | Grok 3 |
|---|---|---|
| LMArena Vision | 1159 | — |
| VPCT | 37.2% | — |
Multilingual Grok 3 leads
GPT-5 Nano: 45.3 (#172), Grok 3: 52.3 (#87)
| Benchmark | GPT-5 Nano | Grok 3 |
|---|---|---|
| LMArena Non-English | 1313 | 1410 |
| LMArena Chinese | 1356 | 1448 |
| LMArena German | 1327 | 1431 |
| LMArena Japanese | 1226 | 1387 |
| LMArena Korean | 1269 | 1373 |
| LMArena Russian | 1296 | 1416 |
| LMArena Spanish | 1360 | 1417 |
| LMArena French | — | 1460 |
Instruction Following Too close to call
GPT-5 Nano: 75.0 (#79), Grok 3: 75.0 (#73)
| Benchmark | GPT-5 Nano | Grok 3 |
|---|---|---|
| IFEval | 93.2% | 88.4% |
| LMArena Instruction Following | 1306 | 1409 |
Long Context Grok 3 leads
GPT-5 Nano: 31.3 (#281), Grok 3: 38.7 (#192)
| Benchmark | GPT-5 Nano | Grok 3 |
|---|---|---|
| Fiction.LiveBench | 44.4% | 58.3% |
| LMArena Longer Query | 1312 | 1439 |
Writing & Preference Grok 3 leads
GPT-5 Nano: 39.1 (#249), Grok 3: 55.8 (#141)
| Benchmark | GPT-5 Nano | Grok 3 |
|---|---|---|
| LMArena Text | 1320 | 1426 |
| LMArena Creative Writing | 1249 | 1414 |
| EQ-Bench Creative Writing | 705 | 1186 |
| WildBench | 80.6% | 84.9% |
| LMArena Multi-Turn | 1311 | 1425 |
| Short-Story Creative Writing | — | 76.4% |
Frequently asked questions
Is GPT-5 Nano better than Grok 3?
Grok 3 is the stronger model overall, scoring 39.9 to 33.5 on the Noometry Index.
Is GPT-5 Nano or Grok 3 better for coding?
Grok 3 scores higher on coding benchmarks: 41.9 versus 33.6 in the Noometry coding category.
How many benchmarks do GPT-5 Nano and Grok 3 share?
34 benchmarks have published results for both models. GPT-5 Nano has 49 scored results on Noometry and Grok 3 has 40.