Model comparison
GPT-6 Sol vs Grok 4.20 Multi-Agent
GPT-6 Sol is the stronger model overall, scoring 49.2 to 45.5 on the Noometry Index. Grok 4.20 Multi-Agent costs 2.6× less per token, which makes it the better buy when GPT-6 Sol's lead doesn't matter for your workload.
Last verified . 14 shared benchmarks.
Summary
- They share 14 benchmarks with published results for both. GPT-6 Sol scores higher in 5 categories and Grok 4.20 Multi-Agent in 4 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in coding, where GPT-6 Sol leads 59.6 to 42.4.
- Grok 4.20 Multi-Agent is cheaper at $1.25 / $2.50 per million input/output tokens, against $2 / $10 for GPT-6 Sol.
- GPT-6 Sol accepts more context: 1.05M tokens versus 1M.
Side by side
| GPT-6 Sol | Grok 4.20 Multi-Agent | |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 49.2 | 45.5 |
| Released | 2026-09-22 | 2026-03-09 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | 1M |
| Max output | 128K | 30K |
| Input $ / M tokens | $2 | $1.25 |
| Output $ / M tokens | $10 | $2.50 |
| Results tracked | 22 | 20 |
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Category by category
Coding GPT-6 Sol leads
GPT-6 Sol: 59.6 (#11), Grok 4.20 Multi-Agent: 42.4 (#91)
| Benchmark | GPT-6 Sol | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Coding | 1453 | 1458 |
| DeepSWE | 68.8% | — |
| FrontierCode | 49.3% | — |
| LMArena WebDev | 1692 | — |
Agentic & Tool Use Not comparable
GPT-6 Sol: 33.5 (#49), Grok 4.20 Multi-Agent: —
| Benchmark | GPT-6 Sol | Grok 4.20 Multi-Agent |
|---|---|---|
| GDP.pdf | 28% | — |
| LMArena Search | — | 1204 |
Reasoning GPT-6 Sol leads
GPT-6 Sol: 49.3 (#34), Grok 4.20 Multi-Agent: 42.4 (#44)
| Benchmark | GPT-6 Sol | Grok 4.20 Multi-Agent |
|---|---|---|
| NYT Connections (extended) | 90.1% | 89.6% |
| LMArena Hard Prompts | 1420 | 1448 |
| EBR-Bench | 53.3% | — |
Math Too close to call
GPT-6 Sol: 35.8 (#135), Grok 4.20 Multi-Agent: 36.6 (#106)
| Benchmark | GPT-6 Sol | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Math | 1404 | 1441 |
Knowledge GPT-6 Sol leads
GPT-6 Sol: 43.0 (#87), Grok 4.20 Multi-Agent: 39.7 (#116)
| Benchmark | GPT-6 Sol | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Expert | 1449 | 1445 |
| Vectara Hallucination Rate | 6.5% | — |
Multimodal GPT-6 Sol leads
GPT-6 Sol: 47.6 (#9), Grok 4.20 Multi-Agent: 39.8 (#44)
| Benchmark | GPT-6 Sol | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Vision | — | 1259 |
| Furniture Assembly | 58.3% | — |
Multilingual Grok 4.20 Multi-Agent leads
GPT-6 Sol: 51.0 (#113), Grok 4.20 Multi-Agent: 54.6 (#40)
| Benchmark | GPT-6 Sol | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Non-English | 1389 | 1440 |
| LMArena Chinese | 1416 | 1475 |
| LMArena Russian | 1407 | 1457 |
| LMArena Spanish | 1377 | 1447 |
| LMArena French | — | 1467 |
| LMArena German | — | 1456 |
| LMArena Japanese | — | 1405 |
| LMArena Korean | — | 1416 |
Instruction Following Too close to call
GPT-6 Sol: 74.4 (#97), Grok 4.20 Multi-Agent: 75.0 (#80)
| Benchmark | GPT-6 Sol | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Instruction Following | 1406 | 1420 |
Long Context Too close to call
GPT-6 Sol: 43.2 (#100), Grok 4.20 Multi-Agent: 43.7 (#84)
| Benchmark | GPT-6 Sol | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Longer Query | 1415 | 1430 |
Writing & Preference GPT-6 Sol leads
GPT-6 Sol: 72.3 (#15), Grok 4.20 Multi-Agent: 64.1 (#57)
| Benchmark | GPT-6 Sol | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Text | 1396 | 1450 |
| LMArena Creative Writing | 1392 | 1435 |
| LMArena Multi-Turn | 1405 | 1451 |
| EQ-Bench Creative Writing | 2125 | — |
Frequently asked questions
Is GPT-6 Sol better than Grok 4.20 Multi-Agent?
GPT-6 Sol is the stronger model overall, scoring 49.2 to 45.5 on the Noometry Index. Grok 4.20 Multi-Agent costs 2.6× 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 4.20 Multi-Agent?
Grok 4.20 Multi-Agent is cheaper. It lists at $1.25 per million input tokens and $2.50 per million output tokens; GPT-6 Sol lists at $2 and $10.
Is GPT-6 Sol or Grok 4.20 Multi-Agent better for coding?
GPT-6 Sol scores higher on coding benchmarks: 59.6 versus 42.4 in the Noometry coding category.
Which has the bigger context window?
GPT-6 Sol does, with 1.05M tokens against 1M.
How many benchmarks do GPT-6 Sol and Grok 4.20 Multi-Agent share?
14 benchmarks have published results for both models. GPT-6 Sol has 22 scored results on Noometry and Grok 4.20 Multi-Agent has 20.