Model comparison
GPT-6 Sol vs Grok 4.1 Fast
GPT-6 Sol is the stronger model overall, scoring 61.8 to 41.4 on the Noometry Index. Grok 4.1 Fast costs 15× less per token, which makes it the better buy when GPT-6 Sol's lead doesn't matter for your workload.
Last verified . 26 shared benchmarks.
Summary
- They share 26 benchmarks with published results for both. GPT-6 Sol scores higher in 9 categories and Grok 4.1 Fast in 1 category; 7 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-6 Sol leads 87.2 to 31.9.
- The biggest single-benchmark swing is ProofBench: 83% for GPT-6 Sol and 4% for Grok 4.1 Fast.
- Grok 4.1 Fast is cheaper at $0.20 / $0.50 per million input/output tokens, against $2 / $10 for GPT-6 Sol.
- GPT-6 Sol accepts more context: 1.05M tokens versus 128K.
Side by side
| GPT-6 Sol | Grok 4.1 Fast | |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 61.8 | 41.4 |
| Released | 2026-09-22 | 2025-06-27 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | 128K |
| Max output | 128K | 30K |
| Input $ / M tokens | $2 | $0.20 |
| Output $ / M tokens | $10 | $0.50 |
| Results tracked | 45 | 32 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding GPT-6 Sol leads
GPT-6 Sol: 60.1 (#11), Grok 4.1 Fast: 34.1 (#245)
| Benchmark | GPT-6 Sol | Grok 4.1 Fast |
|---|---|---|
| LMArena WebDev | 1688 | 1242 |
| LMArena Coding | 1447 | 1411 |
| ALE-Bench | 2,462 | 394.93 |
| DeepSWE | 68.8% | — |
| FrontierCode | 49.3% | — |
| SciCode | 57.6% | — |
Agentic & Tool Use Too close to call
GPT-6 Sol: 37.2 (#36), Grok 4.1 Fast: 36.3 (#39)
| Benchmark | GPT-6 Sol | Grok 4.1 Fast |
|---|---|---|
| Vending-Bench 2 | 14,428 | 1,107 |
| APEX-Agents | 54.3% | — |
| Berkeley Function Calling Leaderboard | — | 69.6% |
| τ²-bench Banking | — | 13.1% |
| GDP.pdf | 26.4% | — |
| LMArena Search | — | 1171 |
Reasoning GPT-6 Sol leads
GPT-6 Sol: 74.0 (#9), Grok 4.1 Fast: 43.4 (#49)
| Benchmark | GPT-6 Sol | Grok 4.1 Fast |
|---|---|---|
| NYT Connections (extended) | 90.1% | 87.4% |
| LMArena Hard Prompts | 1418 | 1407 |
| DTBench | 97.3% | 87.7% |
| ARC-AGI-2 | 89.6% | — |
| SimpleBench | — | 56% |
| ARC-AGI-1 | 95.5% | — |
| CritPt | 30.9% | — |
| EBR-Bench | 53.3% | — |
| Mystery Game Puzzles | 56% | — |
| LMCA | 59.1% | — |
| Epoch Capabilities Index | 162.72 | — |
| ForecastBench | — | 61 |
Math GPT-6 Sol leads
GPT-6 Sol: 87.2 (#7), Grok 4.1 Fast: 31.9 (#221)
| Benchmark | GPT-6 Sol | Grok 4.1 Fast |
|---|---|---|
| ProofBench | 83% | 4% |
| LMArena Math | 1402 | 1408 |
| FrontierMath (Tiers 1-3) | 89.8% | — |
| FrontierMath Tier 4 | 90% | — |
| MathArena Final-Answer Competitions | — | 60.9% |
| OTIS Mock AIME 2024-2025 | 100% | — |
Knowledge GPT-6 Sol leads
GPT-6 Sol: 64.8 (#15), Grok 4.1 Fast: 33.1 (#207)
| Benchmark | GPT-6 Sol | Grok 4.1 Fast |
|---|---|---|
| Vectara Hallucination Rate | 6.5% | 17.8% |
| LMArena Expert | 1439 | 1399 |
| GPQA Diamond | 94.3% | — |
| SimpleQA Verified | 60.7% | — |
Multimodal GPT-6 Sol leads
GPT-6 Sol: 47.6 (#10), Grok 4.1 Fast: 37.0 (#76)
| Benchmark | GPT-6 Sol | Grok 4.1 Fast |
|---|---|---|
| LMArena Vision | 1245 | 1201 |
| Blueprint-Bench 2 | 36.9% | — |
| Furniture Assembly | 58.3% | — |
Multilingual Too close to call
GPT-6 Sol: 50.5 (#118), Grok 4.1 Fast: 51.0 (#114)
| Benchmark | GPT-6 Sol | Grok 4.1 Fast |
|---|---|---|
| LMArena Non-English | 1385 | 1391 |
| LMArena Chinese | 1405 | 1441 |
| LMArena French | 1410 | 1415 |
| LMArena German | 1390 | 1404 |
| LMArena Japanese | 1385 | 1349 |
| LMArena Korean | 1341 | 1361 |
| LMArena Russian | 1401 | 1387 |
| LMArena Spanish | 1384 | 1413 |
Instruction Following GPT-6 Sol leads
GPT-6 Sol: 74.5 (#94), Grok 4.1 Fast: 72.7 (#133)
| Benchmark | GPT-6 Sol | Grok 4.1 Fast |
|---|---|---|
| LMArena Instruction Following | 1412 | 1376 |
Long Context Too close to call
GPT-6 Sol: 43.1 (#108), Grok 4.1 Fast: 42.4 (#126)
| Benchmark | GPT-6 Sol | Grok 4.1 Fast |
|---|---|---|
| LMArena Longer Query | 1411 | 1390 |
Writing & Preference GPT-6 Sol leads
GPT-6 Sol: 71.9 (#18), Grok 4.1 Fast: 57.2 (#131)
| Benchmark | GPT-6 Sol | Grok 4.1 Fast |
|---|---|---|
| LMArena Text | 1395 | 1408 |
| LMArena Creative Writing | 1378 | 1394 |
| EQ-Bench Creative Writing | 2125 | 1327 |
| LMArena Multi-Turn | 1412 | 1389 |
Frequently asked questions
Is GPT-6 Sol better than Grok 4.1 Fast?
GPT-6 Sol is the stronger model overall, scoring 61.8 to 41.4 on the Noometry Index. Grok 4.1 Fast costs 15× less per token, which makes it the better buy when GPT-6 Sol's lead doesn't matter for your workload.
Which is cheaper, GPT-6 Sol or Grok 4.1 Fast?
Grok 4.1 Fast is cheaper. It lists at $0.20 per million input tokens and $0.50 per million output tokens; GPT-6 Sol lists at $2 and $10.
Is GPT-6 Sol or Grok 4.1 Fast better for coding?
GPT-6 Sol scores higher on coding benchmarks: 60.1 versus 34.1 in the Noometry coding category.
Which has the bigger context window?
GPT-6 Sol does, with 1.05M tokens against 128K.
How many benchmarks do GPT-6 Sol and Grok 4.1 Fast share?
26 benchmarks have published results for both models. GPT-6 Sol has 45 scored results on Noometry and Grok 4.1 Fast has 32.