Model comparison
Grok 4.5 vs o3-pro
Grok 4.5 is the stronger model overall, scoring 55.0 to 42.9 on the Noometry Index.
Last verified . 7 shared benchmarks.
Summary
- They share 7 benchmarks with published results for both. Grok 4.5 scores higher in 3 categories and o3-pro in 2 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Grok 4.5 leads 62.3 to 29.5.
- The biggest single-benchmark swing is ARC-AGI-2: 52.6% for Grok 4.5 and 4.9% for o3-pro.
- Grok 4.5 is cheaper at $2 / $6 per million input/output tokens, against $20 / $80 for o3-pro.
- Grok 4.5 accepts more context: 500K tokens versus 200K.
Side by side
| Grok 4.5 | o3-pro | |
|---|---|---|
| Provider | xAI | OpenAI |
| Noometry Index | 55.0 | 42.9 |
| Released | 2026-07-08 | 2025-06-10 |
| Weights | Proprietary | Proprietary |
| Context window | 500K | 200K |
| Max output | 500K | 100K |
| Input $ / M tokens | $2 | $20 |
| Output $ / M tokens | $6 | $80 |
| Results tracked | 52 | 12 |
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Category by category
Coding o3-pro leads
Grok 4.5: 52.2 (#35), o3-pro: 55.5 (#24)
| Benchmark | Grok 4.5 | o3-pro |
|---|---|---|
| WeirdML | 46.4% | 58.2% |
| DeepSWE | 53.8% | — |
| FrontierCode | 42.4% | — |
| Aider Polyglot | — | 84.9% |
| LMArena WebDev | 1553 | — |
| SciCode | 54.1% | — |
| LMArena Coding | 1474 | — |
| ALE-Bench | 1,309 | — |
Agentic & Tool Use Not comparable
Grok 4.5: 44.4 (#17), o3-pro: —
| Benchmark | Grok 4.5 | o3-pro |
|---|---|---|
| APEX-Agents | 56.2% | — |
| τ²-bench Banking | 47.9% | — |
| PostTrainBench | 23.4% | — |
| GBAEval | 65.4% | — |
| GDP.pdf | 14% | — |
| LMArena Search | 1213 | — |
| Vending-Bench 2 | 3,887 | — |
Reasoning Grok 4.5 leads
Grok 4.5: 56.1 (#25), o3-pro: 23.8 (#171)
| Benchmark | Grok 4.5 | o3-pro |
|---|---|---|
| ARC-AGI-2 | 52.6% | 4.9% |
| Kagi LLM Benchmark | 83.5% | 72.1% |
| ARC-AGI-1 | 87.2% | 59.3% |
| DTBench | 96.5% | 86.9% |
| LMCA | 45.2% | 38.5% |
| Epoch Capabilities Index | 153.92 | 147.42 |
| SimpleBench | 70% | — |
| NYT Connections (extended) | 79.9% | — |
| CritPt | 15.4% | — |
| Chess Puzzles | 36% | — |
| LMArena Hard Prompts | 1462 | — |
| Surface Evolver Bench | 74.4% | — |
Math Not comparable
Grok 4.5: 60.9 (#35), o3-pro: —
| Benchmark | Grok 4.5 | o3-pro |
|---|---|---|
| FrontierMath (Tiers 1-3) | 57.2% | — |
| FrontierMath Tier 4 | 24.4% | — |
| OTIS Mock AIME 2024-2025 | 97.8% | — |
| ProofBench | 31% | — |
| LMArena Math | 1459 | — |
Knowledge Grok 4.5 leads
Grok 4.5: 62.3 (#24), o3-pro: 29.5 (#238)
| Benchmark | Grok 4.5 | o3-pro |
|---|---|---|
| GPQA Diamond | 93.4% | — |
| SimpleQA Verified | 48.3% | — |
| Confabulations | — | 14.2% |
| Vectara Hallucination Rate | — | 23.3% |
| LMArena Expert | 1466 | — |
Multimodal Not comparable
Grok 4.5: 37.6 (#72), o3-pro: —
| Benchmark | Grok 4.5 | o3-pro |
|---|---|---|
| LMArena Vision | 1288 | — |
| Blueprint-Bench 2 | 27.3% | — |
| Furniture Assembly | 22.5% | — |
| LMArena Document | 1452 | — |
Multilingual Not comparable
Grok 4.5: 54.4 (#42), o3-pro: —
| Benchmark | Grok 4.5 | o3-pro |
|---|---|---|
| LMArena Non-English | 1440 | — |
| LMArena Chinese | 1496 | — |
| LMArena French | 1456 | — |
| LMArena German | 1446 | — |
| LMArena Japanese | 1428 | — |
| LMArena Korean | 1404 | — |
| LMArena Russian | 1448 | — |
| LMArena Spanish | 1450 | — |
Instruction Following Not comparable
Grok 4.5: 76.0 (#48), o3-pro: —
| Benchmark | Grok 4.5 | o3-pro |
|---|---|---|
| LMArena Instruction Following | 1446 | — |
Long Context o3-pro leads
Grok 4.5: 44.8 (#56), o3-pro: 72.2 (#1)
| Benchmark | Grok 4.5 | o3-pro |
|---|---|---|
| Fiction.LiveBench | — | 97.2% |
| LMArena Longer Query | 1463 | — |
Writing & Preference Grok 4.5 leads
Grok 4.5: 65.8 (#42), o3-pro: 57.1 (#133)
| Benchmark | Grok 4.5 | o3-pro |
|---|---|---|
| LMArena Text | 1448 | — |
| LMArena Creative Writing | 1442 | — |
| Short-Story Creative Writing | — | 84.4% |
| EQ-Bench Creative Writing | 1579 | — |
| LMArena Multi-Turn | 1456 | — |
Frequently asked questions
Is Grok 4.5 better than o3-pro?
Grok 4.5 is the stronger model overall, scoring 55.0 to 42.9 on the Noometry Index.
Which is cheaper, Grok 4.5 or o3-pro?
Grok 4.5 is cheaper. It lists at $2 per million input tokens and $6 per million output tokens; o3-pro lists at $20 and $80.
Is Grok 4.5 or o3-pro better for coding?
o3-pro scores higher on coding benchmarks: 55.5 versus 52.2 in the Noometry coding category.
Which has the bigger context window?
Grok 4.5 does, with 500K tokens against 200K.
How many benchmarks do Grok 4.5 and o3-pro share?
7 benchmarks have published results for both models. Grok 4.5 has 52 scored results on Noometry and o3-pro has 12.