Model comparison
GPT-6 Sol vs Grok 4 Fast
GPT-6 Sol is the stronger model overall, scoring 49.2 to 39.0 on the Noometry Index.
Last verified . 15 shared benchmarks.
Summary
- They share 15 benchmarks with published results for both. GPT-6 Sol scores higher in 6 categories and Grok 4 Fast in 3 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in coding, where GPT-6 Sol leads 59.6 to 32.3.
- The biggest single-benchmark swing is Vectara Hallucination Rate: 6.5% for GPT-6 Sol and 19.7% for Grok 4 Fast.
Side by side
| GPT-6 Sol | Grok 4 Fast | |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 49.2 | 39.0 |
| Released | 2026-09-22 | 2025-09-19 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | — |
| Max output | 128K | — |
| Input $ / M tokens | $2 | — |
| Output $ / M tokens | $10 | — |
| Results tracked | 22 | 30 |
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Category by category
Coding GPT-6 Sol leads
GPT-6 Sol: 59.6 (#11), Grok 4 Fast: 32.3 (#264)
| Benchmark | GPT-6 Sol | Grok 4 Fast |
|---|---|---|
| LMArena WebDev | 1692 | 1160 |
| LMArena Coding | 1453 | 1429 |
| DeepSWE | 68.8% | — |
| FrontierCode | 49.3% | — |
| WeirdML | — | 42.9% |
Agentic & Tool Use GPT-6 Sol leads
GPT-6 Sol: 33.5 (#49), Grok 4 Fast: 29.3 (#80)
| Benchmark | GPT-6 Sol | Grok 4 Fast |
|---|---|---|
| τ²-bench Banking | — | 15.7% |
| Cybench | — | 30% |
| GDP.pdf | 28% | — |
| LMArena Search | — | 1171 |
Reasoning GPT-6 Sol leads
GPT-6 Sol: 49.3 (#34), Grok 4 Fast: 22.5 (#179)
| Benchmark | GPT-6 Sol | Grok 4 Fast |
|---|---|---|
| LMArena Hard Prompts | 1420 | 1413 |
| ARC-AGI-2 | — | 5.3% |
| Kagi LLM Benchmark | — | 66.1% |
| NYT Connections (extended) | 90.1% | — |
| ARC-AGI-1 | — | 48.5% |
| EBR-Bench | 53.3% | — |
| DTBench | — | 82.7% |
| Epoch Capabilities Index | — | 144.21 |
| ForecastBench | — | 60.5 |
Math Too close to call
GPT-6 Sol: 35.8 (#135), Grok 4 Fast: 36.1 (#126)
| Benchmark | GPT-6 Sol | Grok 4 Fast |
|---|---|---|
| LMArena Math | 1404 | 1419 |
Knowledge GPT-6 Sol leads
GPT-6 Sol: 43.0 (#87), Grok 4 Fast: 31.5 (#211)
| Benchmark | GPT-6 Sol | Grok 4 Fast |
|---|---|---|
| Vectara Hallucination Rate | 6.5% | 19.7% |
| LMArena Expert | 1449 | 1411 |
Multimodal Not comparable
GPT-6 Sol: 47.6 (#9), Grok 4 Fast: —
| Benchmark | GPT-6 Sol | Grok 4 Fast |
|---|---|---|
| Furniture Assembly | 58.3% | — |
Multilingual Too close to call
GPT-6 Sol: 51.0 (#113), Grok 4 Fast: 51.5 (#106)
| Benchmark | GPT-6 Sol | Grok 4 Fast |
|---|---|---|
| LMArena Non-English | 1389 | 1397 |
| LMArena Chinese | 1416 | 1458 |
| LMArena Russian | 1407 | 1387 |
| LMArena Spanish | 1377 | 1414 |
| LMArena French | — | 1433 |
| LMArena German | — | 1383 |
| LMArena Japanese | — | 1358 |
| LMArena Korean | — | 1359 |
Instruction Following Too close to call
GPT-6 Sol: 74.4 (#97), Grok 4 Fast: 73.4 (#116)
| Benchmark | GPT-6 Sol | Grok 4 Fast |
|---|---|---|
| LMArena Instruction Following | 1406 | 1388 |
Long Context Grok 4 Fast leads
GPT-6 Sol: 43.2 (#100), Grok 4 Fast: 63.2 (#3)
| Benchmark | GPT-6 Sol | Grok 4 Fast |
|---|---|---|
| LMArena Longer Query | 1415 | 1415 |
| Fiction.LiveBench | — | 94.4% |
Writing & Preference GPT-6 Sol leads
GPT-6 Sol: 72.3 (#15), Grok 4 Fast: 60.2 (#96)
| Benchmark | GPT-6 Sol | Grok 4 Fast |
|---|---|---|
| LMArena Text | 1396 | 1407 |
| LMArena Creative Writing | 1392 | 1388 |
| LMArena Multi-Turn | 1405 | 1414 |
| EQ-Bench Creative Writing | 2125 | — |
Frequently asked questions
Is GPT-6 Sol better than Grok 4 Fast?
GPT-6 Sol is the stronger model overall, scoring 49.2 to 39.0 on the Noometry Index.
Is GPT-6 Sol or Grok 4 Fast better for coding?
GPT-6 Sol scores higher on coding benchmarks: 59.6 versus 32.3 in the Noometry coding category.
How many benchmarks do GPT-6 Sol and Grok 4 Fast share?
15 benchmarks have published results for both models. GPT-6 Sol has 22 scored results on Noometry and Grok 4 Fast has 30.