Model comparison
Grok 4.3 vs o3-mini
Grok 4.3 is the stronger model overall, scoring 43.8 to 36.7 on the Noometry Index.
Last verified . 30 shared benchmarks.
Summary
- They share 30 benchmarks with published results for both. Grok 4.3 scores higher in 7 categories and o3-mini in 2 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.3 leads 35.9 to 16.3.
- The biggest single-benchmark swing is FrontierMath (Tiers 1-3): 42.8% for Grok 4.3 and 18.6% for o3-mini.
- Grok 4.3 is cheaper at $1.25 / $2.50 per million input/output tokens, against $1.10 / $4.40 for o3-mini.
- Grok 4.3 accepts more context: 1M tokens versus 200K.
Side by side
| Grok 4.3 | o3-mini | |
|---|---|---|
| Provider | xAI | OpenAI |
| Noometry Index | 43.8 | 36.7 |
| Released | 2026-04-17 | 2024-12-20 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | 200K |
| Max output | 30K | 100K |
| Input $ / M tokens | $1.25 | $1.10 |
| Output $ / M tokens | $2.50 | $4.40 |
| Results tracked | 40 | 51 |
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Category by category
Coding Too close to call
Grok 4.3: 41.6 (#121), o3-mini: 40.8 (#132)
| Benchmark | Grok 4.3 | o3-mini |
|---|---|---|
| SciCode | 47.3% | 39.8% |
| WeirdML | 49.9% | 43.7% |
| LMArena Coding | 1415 | 1378 |
| Aider Polyglot | — | 60.4% |
| LMArena WebDev | 1357 | — |
| GSO | — | 1.3% |
| LiveBench Coding | — | 82.7% |
| CadEval | — | 54% |
| ALE-Bench | 944.17 | — |
Agentic & Tool Use o3-mini leads
Grok 4.3: 27.7 (#99), o3-mini: 29.6 (#84)
| Benchmark | Grok 4.3 | o3-mini |
|---|---|---|
| Cybench | — | 22.5% |
| GDP.pdf | 8% | — |
| LMArena Search | 1165 | — |
| Vending-Bench 2 | 35.26 | — |
Reasoning Grok 4.3 leads
Grok 4.3: 35.9 (#68), o3-mini: 16.3 (#305)
| Benchmark | Grok 4.3 | o3-mini |
|---|---|---|
| CritPt | 8% | 0.3% |
| Chess Puzzles | 25% | 17% |
| LMArena Hard Prompts | 1396 | 1366 |
| DTBench | 90.7% | 68.8% |
| LMCA | 38.3% | 19% |
| Epoch Capabilities Index | 149.16 | 140.34 |
| ForecastBench | 60.3 | 59.6 |
| ARC-AGI-2 | — | 3% |
| SimpleBench | — | 22.8% |
| NYT Connections (extended) | 55.2% | — |
| ARC-AGI-1 | — | 34.5% |
| LiveBench Reasoning | — | 89.6% |
| Mystery Game Puzzles | — | 7% |
| LiveBench Data Analysis | — | 70.6% |
| LiveBench | — | 75.9% |
Math Grok 4.3 leads
Grok 4.3: 46.0 (#74), o3-mini: 28.1 (#244)
| Benchmark | Grok 4.3 | o3-mini |
|---|---|---|
| FrontierMath (Tiers 1-3) | 42.8% | 18.6% |
| FrontierMath Tier 4 | 14.6% | 0% |
| OTIS Mock AIME 2024-2025 | 93.3% | 76.9% |
| LMArena Math | 1388 | 1396 |
| ProofBench | 11% | — |
| LiveBench Math | — | 77.3% |
| MATH Level 5 | — | 96.5% |
| FrontierMath (Feb 2025 set) | — | 12.4% |
| FrontierMath Tier 4 (v1) | — | 4.2% |
Knowledge Grok 4.3 leads
Grok 4.3: 52.5 (#62), o3-mini: 38.3 (#146)
| Benchmark | Grok 4.3 | o3-mini |
|---|---|---|
| GPQA Diamond | 88.8% | 77% |
| SimpleQA Verified | 33.2% | 15.3% |
| LMArena Expert | 1385 | 1364 |
| Confabulations | — | 17.9% |
Multimodal Not comparable
Grok 4.3: 31.6 (#104), o3-mini: —
| Benchmark | Grok 4.3 | o3-mini |
|---|---|---|
| LMArena Vision | 1229 | — |
| Blueprint-Bench 2 | 0% | — |
Multilingual Grok 4.3 leads
Grok 4.3: 50.5 (#120), o3-mini: 45.7 (#164)
| Benchmark | Grok 4.3 | o3-mini |
|---|---|---|
| LMArena Non-English | 1385 | 1319 |
| LMArena Chinese | 1422 | 1379 |
| LMArena French | 1412 | 1334 |
| LMArena German | 1395 | 1303 |
| LMArena Japanese | 1379 | 1286 |
| LMArena Korean | 1356 | 1314 |
| LMArena Russian | 1399 | 1304 |
| LMArena Spanish | 1398 | 1321 |
Instruction Following o3-mini leads
Grok 4.3: 72.1 (#140), o3-mini: 75.1 (#72)
| Benchmark | Grok 4.3 | o3-mini |
|---|---|---|
| LMArena Instruction Following | 1366 | 1337 |
| LiveBench Instruction Following | — | 84.4% |
Long Context Grok 4.3 leads
Grok 4.3: 42.5 (#123), o3-mini: 33.8 (#256)
| Benchmark | Grok 4.3 | o3-mini |
|---|---|---|
| LMArena Longer Query | 1393 | 1343 |
| Fiction.LiveBench | — | 50% |
Writing & Preference Grok 4.3 leads
Grok 4.3: 58.5 (#118), o3-mini: 50.3 (#182)
| Benchmark | Grok 4.3 | o3-mini |
|---|---|---|
| LMArena Text | 1397 | 1337 |
| LMArena Creative Writing | 1380 | 1286 |
| LMArena Multi-Turn | 1406 | 1320 |
| Short-Story Creative Writing | — | 61.7% |
| EQ-Bench 4 | 1075 | — |
| LiveBench Language | — | 50.7% |
Frequently asked questions
Is Grok 4.3 better than o3-mini?
Grok 4.3 is the stronger model overall, scoring 43.8 to 36.7 on the Noometry Index.
Which is cheaper, Grok 4.3 or o3-mini?
Grok 4.3 is cheaper. It lists at $1.25 per million input tokens and $2.50 per million output tokens; o3-mini lists at $1.10 and $4.40.
Is Grok 4.3 or o3-mini better for coding?
They score almost the same on coding (41.6 vs 40.8); test both on your own repository before choosing.
Which has the bigger context window?
Grok 4.3 does, with 1M tokens against 200K.
How many benchmarks do Grok 4.3 and o3-mini share?
30 benchmarks have published results for both models. Grok 4.3 has 40 scored results on Noometry and o3-mini has 51.