Grok 4 vs o3
Grok 4 
o3 Verdict
- Grok 4 and o3 are level on quality (59.8 vs 60.5).
- Grok 4 is stronger in instruction following, long context.
- o3 is stronger in agents & tools, coding, human preference, knowledge, maths, multimodal, reasoning, composite.
- Grok 4 is 2.2× cheaper ($1.56 vs $3.50 per 1M blended).
| Metric | Grok 4 | o3 |
|---|---|---|
| BenchLeader Index | 59.8 | 60.5 |
| Agents & tools score | 53.4 | 68.7 |
| Coding score | 61.2 | 62.0 |
| Human preference score | 59.8 | 62.3 |
| Instruction following score | 67.7 | 63.8 |
| Knowledge score | 56.0 | 56.2 |
| Long context score | 77.7 | 60.9 |
| Maths score | 58.0 | 78.6 |
| Multimodal score | 54.5 | 56.9 |
| Reasoning score | 58.3 | 61.5 |
| Composite score | – | 49.6 |
| Blended price $/M | $1.56 | $3.50 |
| Output speed | – | 130 tok/s |
| Time to first answer | – | 4.4 s |
| Context window | 256k | 200k |
| GPQA Diamond | 87.0% | – |
| OTIS Mock AIME | 84.0% | – |
| Terminal-Bench | 27.2% | – |
| SimpleBench | 60.5% | – |
| Fiction.LiveBench 120k | 96.9% | – |
| Cybench | 43.0% | – |
| WeirdML | 45.7% | – |
| APEX-Agents | 15.2% | – |
| Epoch Capabilities Index | 146.4 | 146.9 |
| LMArena Text | 1411 | 1432 |
| LMArena Hard Prompts | 1420 | 1441 |
| LMArena Coding | 1435 | 1460 |
| LMArena Vision | 1210 | 1214 |
| AA Intelligence Index | – | 20.2 |
| IFBench | – | 71.4% |
| AA-LCR | – | 74.7% |
| MMMU-Pro | – | 70.1% |
| AA-Omniscience | – | -15.6 |
| Terminal-Bench Hard | – | 37.1% |
| GPQA Diamond (AA) | – | 82.7% |
| Humanity's Last Exam (AA) | – | 20.1% |
| τ²-Bench Telecom (AA) | – | 80.7% |
| AIME (Vals) | 90.6% | – |
| LiveCodeBench | 83.3% | – |
| MMLU-Pro | 85.3% | – |
| LegalBench | 83.2% | – |
| CorpFin | 66.0% | – |
| TaxEval | 65.1% | – |
| MedQA | 92.5% | – |
| MGSM | 90.9% | – |
| SWE-bench (Vals) | 57.8% | – |
| GPQA Diamond (Vals) | 88.1% | – |
| IMO 2025 | 21.4% | – |
| MathArena Apex | 2.1% | – |
| PRBench Finance | – | 47.7% |
| PRBench Legal | – | 48.6% |
| MMMU (validation) | – | 82.9% |
| MMMU-Pro (official) | – | 76.4% |
| Kagi LLM Benchmark | 73.6% | 67.6% |
| IFEval (HELM) | 94.9% | 86.9% |
| Omni-MATH (HELM) | 60.3% | 71.4% |
| WildBench (HELM) | 79.7% | 86.1% |
| MMLU-Pro (HELM) | 85.1% | 85.9% |
| GPQA Diamond (HELM) | 72.6% | 75.3% |
| HELM Capabilities mean | 78.5% | 81.1% |
| Aider Polyglot | 79.6% | 81.3% |
| SWE-bench Verified (bash only) | – | 58.4% |
| SWE-bench Verified (any scaffold) | – | 58.4% |
| ARC-AGI-1 | 79.6% | – |
| ARC-AGI-2 | 29.4% | – |
| BFCL Overall | 63.0% | 63.0% |
Data as of 2026-09-13. Best configuration of each model; every score links to its source on the model pages.
Grok 4 vs o3: questions
- Is Grok 4 better than o3?
- Grok 4 and o3 are level on quality (59.8 vs 60.5). The BenchLeader Index combines every independent quality benchmark; o3 is ahead overall as of 2026-09-13, but check the category scores for your use.
- Is Grok 4 better than o3 for coding?
- o3 scores higher in coding (62 vs 61 on the category index, where 50 is average).
- Is Grok 4 better than o3 for agentic tasks?
- o3 scores higher in agentic tasks (69 vs 53 on the category index, where 50 is average).
- Which is cheaper, Grok 4 or o3?
- Grok 4 is cheaper: $1.56 against $3.50 per million tokens, blended at three input tokens per output token.
- Which has the larger context window?
- Grok 4 accepts more context: 256k against 200k tokens.