Model comparison
GPT-5.3 Chat vs Grok-3 mini
GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 41.2 on the Noometry Index.
Last verified . 17 shared benchmarks.
Summary
- They share 17 benchmarks with published results for both. GPT-5.3 Chat scores higher in 5 categories and Grok-3 mini in 3 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5.3 Chat leads 28.5 to 13.6.
Side by side
| GPT-5.3 Chat | Grok-3 mini | |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 42.8 | 41.2 |
| Released | 2026-03-03 | 2025-04-09 |
| Weights | Proprietary | Proprietary |
| Context window | 128K | — |
| Max output | 16K | — |
| Input $ / M tokens | $1.75 | — |
| Output $ / M tokens | $14 | — |
| Results tracked | 18 | 35 |
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Category by category
Coding Too close to call
GPT-5.3 Chat: 41.4 (#124), Grok-3 mini: 40.8 (#131)
| Benchmark | GPT-5.3 Chat | Grok-3 mini |
|---|---|---|
| LMArena Coding | 1408 | 1379 |
| Aider Polyglot | — | 49.3% |
| WeirdML | — | 42.6% |
Reasoning GPT-5.3 Chat leads
GPT-5.3 Chat: 28.5 (#102), Grok-3 mini: 13.6 (#334)
| Benchmark | GPT-5.3 Chat | Grok-3 mini |
|---|---|---|
| LMArena Hard Prompts | 1399 | 1375 |
| ARC-AGI-2 | — | 0.4% |
| Kagi LLM Benchmark | — | 61.3% |
| ARC-AGI-1 | — | 16.5% |
| Epoch Capabilities Index | — | 140.35 |
Math Grok-3 mini leads
GPT-5.3 Chat: 38.2 (#142), Grok-3 mini: 42.1 (#85)
| Benchmark | GPT-5.3 Chat | Grok-3 mini |
|---|---|---|
| LMArena Math | 1389 | 1386 |
| OTIS Mock AIME 2024-2025 | — | 77.8% |
| Omni-MATH | — | 31.8% |
| MATH Level 5 | — | 90.9% |
| FrontierMath (Feb 2025 set) | — | 5.9% |
Knowledge Grok-3 mini leads
GPT-5.3 Chat: 38.8 (#140), Grok-3 mini: 46.4 (#81)
| Benchmark | GPT-5.3 Chat | Grok-3 mini |
|---|---|---|
| LMArena Expert | 1397 | 1395 |
| GPQA Diamond | — | 76.3% |
| MMLU-Pro | — | 79.9% |
| Confabulations | — | 10.8% |
| GPQA (HELM) | — | 67.5% |
Multilingual GPT-5.3 Chat leads
GPT-5.3 Chat: 50.3 (#124), Grok-3 mini: 48.1 (#145)
| Benchmark | GPT-5.3 Chat | Grok-3 mini |
|---|---|---|
| LMArena Non-English | 1382 | 1352 |
| LMArena Chinese | 1432 | 1387 |
| LMArena French | 1397 | 1357 |
| LMArena German | 1384 | 1349 |
| LMArena Japanese | 1352 | 1342 |
| LMArena Korean | 1346 | 1335 |
| LMArena Russian | 1400 | 1353 |
| LMArena Spanish | 1371 | 1381 |
Instruction Following Grok-3 mini leads
GPT-5.3 Chat: 72.8 (#129), Grok-3 mini: 78.5 (#9)
| Benchmark | GPT-5.3 Chat | Grok-3 mini |
|---|---|---|
| LMArena Instruction Following | 1378 | 1357 |
| IFEval | — | 95.1% |
Long Context GPT-5.3 Chat leads
GPT-5.3 Chat: 42.6 (#120), Grok-3 mini: 41.0 (#147)
| Benchmark | GPT-5.3 Chat | Grok-3 mini |
|---|---|---|
| LMArena Longer Query | 1396 | 1372 |
| Fiction.LiveBench | — | 66.7% |
Writing & Preference GPT-5.3 Chat leads
GPT-5.3 Chat: 63.1 (#68), Grok-3 mini: 52.5 (#169)
| Benchmark | GPT-5.3 Chat | Grok-3 mini |
|---|---|---|
| LMArena Text | 1389 | 1370 |
| LMArena Creative Writing | 1355 | 1342 |
| LMArena Multi-Turn | 1412 | 1355 |
| Short-Story Creative Writing | — | 73.5% |
| EQ-Bench Creative Writing | 1690 | — |
| WildBench | — | 65.1% |
Frequently asked questions
Is GPT-5.3 Chat better than Grok-3 mini?
GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 41.2 on the Noometry Index.
Is GPT-5.3 Chat or Grok-3 mini better for coding?
They score almost the same on coding (41.4 vs 40.8); test both on your own repository before choosing.
How many benchmarks do GPT-5.3 Chat and Grok-3 mini share?
17 benchmarks have published results for both models. GPT-5.3 Chat has 18 scored results on Noometry and Grok-3 mini has 35.