Model comparison
Grok 4.3 vs o3-pro
Grok 4.3 and o3-pro score almost the same on the Noometry Index (43.8 vs 42.9), so choose on price, context window or the category you care about most.
Last verified . 4 shared benchmarks.
Summary
- They share 4 benchmarks with published results for both. Grok 4.3 scores higher in 3 categories and o3-pro in 2 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in long context, where o3-pro leads 72.2 to 42.5.
- The biggest single-benchmark swing is WeirdML: 49.9% for Grok 4.3 and 58.2% for o3-pro.
- Grok 4.3 is cheaper at $1.25 / $2.50 per million input/output tokens, against $20 / $80 for o3-pro.
- Grok 4.3 accepts more context: 1M tokens versus 200K.
Side by side
| Grok 4.3 | o3-pro | |
|---|---|---|
| Provider | xAI | OpenAI |
| Noometry Index | 43.8 | 42.9 |
| Released | 2026-04-17 | 2025-06-10 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | 200K |
| Max output | 30K | 100K |
| Input $ / M tokens | $1.25 | $20 |
| Output $ / M tokens | $2.50 | $80 |
| Results tracked | 40 | 12 |
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Category by category
Coding o3-pro leads
Grok 4.3: 41.6 (#121), o3-pro: 55.5 (#24)
| Benchmark | Grok 4.3 | o3-pro |
|---|---|---|
| WeirdML | 49.9% | 58.2% |
| Aider Polyglot | — | 84.9% |
| LMArena WebDev | 1357 | — |
| SciCode | 47.3% | — |
| LMArena Coding | 1415 | — |
| ALE-Bench | 944.17 | — |
Agentic & Tool Use Not comparable
Grok 4.3: 27.7 (#99), o3-pro: —
| Benchmark | Grok 4.3 | o3-pro |
|---|---|---|
| GDP.pdf | 8% | — |
| LMArena Search | 1165 | — |
| Vending-Bench 2 | 35.26 | — |
Reasoning Grok 4.3 leads
Grok 4.3: 35.9 (#68), o3-pro: 23.8 (#171)
| Benchmark | Grok 4.3 | o3-pro |
|---|---|---|
| DTBench | 90.7% | 86.9% |
| LMCA | 38.3% | 38.5% |
| Epoch Capabilities Index | 149.16 | 147.42 |
| ARC-AGI-2 | — | 4.9% |
| Kagi LLM Benchmark | — | 72.1% |
| NYT Connections (extended) | 55.2% | — |
| ARC-AGI-1 | — | 59.3% |
| CritPt | 8% | — |
| Chess Puzzles | 25% | — |
| LMArena Hard Prompts | 1396 | — |
| ForecastBench | 60.3 | — |
Math Not comparable
Grok 4.3: 46.0 (#74), o3-pro: —
| Benchmark | Grok 4.3 | o3-pro |
|---|---|---|
| FrontierMath (Tiers 1-3) | 42.8% | — |
| FrontierMath Tier 4 | 14.6% | — |
| OTIS Mock AIME 2024-2025 | 93.3% | — |
| ProofBench | 11% | — |
| LMArena Math | 1388 | — |
Knowledge Grok 4.3 leads
Grok 4.3: 52.5 (#62), o3-pro: 29.5 (#238)
| Benchmark | Grok 4.3 | o3-pro |
|---|---|---|
| GPQA Diamond | 88.8% | — |
| SimpleQA Verified | 33.2% | — |
| Confabulations | — | 14.2% |
| Vectara Hallucination Rate | — | 23.3% |
| LMArena Expert | 1385 | — |
Multimodal Not comparable
Grok 4.3: 31.6 (#104), o3-pro: —
| Benchmark | Grok 4.3 | o3-pro |
|---|---|---|
| LMArena Vision | 1229 | — |
| Blueprint-Bench 2 | 0% | — |
Multilingual Not comparable
Grok 4.3: 50.5 (#120), o3-pro: —
| Benchmark | Grok 4.3 | o3-pro |
|---|---|---|
| LMArena Non-English | 1385 | — |
| LMArena Chinese | 1422 | — |
| LMArena French | 1412 | — |
| LMArena German | 1395 | — |
| LMArena Japanese | 1379 | — |
| LMArena Korean | 1356 | — |
| LMArena Russian | 1399 | — |
| LMArena Spanish | 1398 | — |
Instruction Following Not comparable
Grok 4.3: 72.1 (#140), o3-pro: —
| Benchmark | Grok 4.3 | o3-pro |
|---|---|---|
| LMArena Instruction Following | 1366 | — |
Long Context o3-pro leads
Grok 4.3: 42.5 (#123), o3-pro: 72.2 (#1)
| Benchmark | Grok 4.3 | o3-pro |
|---|---|---|
| Fiction.LiveBench | — | 97.2% |
| LMArena Longer Query | 1393 | — |
Writing & Preference Grok 4.3 leads
Grok 4.3: 58.5 (#118), o3-pro: 57.1 (#133)
| Benchmark | Grok 4.3 | o3-pro |
|---|---|---|
| LMArena Text | 1397 | — |
| LMArena Creative Writing | 1380 | — |
| Short-Story Creative Writing | — | 84.4% |
| EQ-Bench 4 | 1075 | — |
| LMArena Multi-Turn | 1406 | — |
Frequently asked questions
Is Grok 4.3 better than o3-pro?
Grok 4.3 and o3-pro score almost the same on the Noometry Index (43.8 vs 42.9), so choose on price, context window or the category you care about most.
Which is cheaper, Grok 4.3 or o3-pro?
Grok 4.3 is cheaper. It lists at $1.25 per million input tokens and $2.50 per million output tokens; o3-pro lists at $20 and $80.
Is Grok 4.3 or o3-pro better for coding?
o3-pro scores higher on coding benchmarks: 55.5 versus 41.6 in the Noometry coding category.
Which has the bigger context window?
Grok 4.3 does, with 1M tokens against 200K.
How many benchmarks do Grok 4.3 and o3-pro share?
4 benchmarks have published results for both models. Grok 4.3 has 40 scored results on Noometry and o3-pro has 12.