Model comparison
GPT-5.1-Codex vs Grok 4.1
Grok 4.1 is the stronger model overall, scoring 41.5 to 38.6 on the Noometry Index.
Last verified . 1 shared benchmarks.
Summary
- They share 1 benchmark with published results for both. GPT-5.1-Codex scores higher in 2 categories and Grok 4.1 in 1 category; 3 gaps are clear of the uncertainty.
- The widest gap is in math, where Grok 4.1 leads 38.9 to 30.3.
Side by side
| GPT-5.1-Codex | Grok 4.1 | |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 38.6 | 41.5 |
| Released | 2025-11-12 | 2025-11-17 |
| Weights | Proprietary | Proprietary |
| Context window | 400K | — |
| Max output | 128K | — |
| Input $ / M tokens | $1.25 | — |
| Output $ / M tokens | $10 | — |
| Results tracked | 6 | 19 |
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Category by category
Coding GPT-5.1-Codex leads
GPT-5.1-Codex: 41.9 (#116), Grok 4.1: 33.7 (#253)
| Benchmark | GPT-5.1-Codex | Grok 4.1 |
|---|---|---|
| LMArena WebDev | 1337 | 1214 |
| SWE-bench Verified (bash only) | 66% | — |
| LMArena Coding | — | 1445 |
| ALE-Bench | 1,245 | — |
Agentic & Tool Use GPT-5.1-Codex leads
GPT-5.1-Codex: 38.0 (#33), Grok 4.1: 34.1 (#49)
| Benchmark | GPT-5.1-Codex | Grok 4.1 |
|---|---|---|
| Terminal-Bench | 60.4% | — |
| Cybench | — | 39% |
| METR Time Horizons | 70.8% | — |
Reasoning Not comparable
GPT-5.1-Codex: —, Grok 4.1: 29.5 (#91)
| Benchmark | GPT-5.1-Codex | Grok 4.1 |
|---|---|---|
| LMArena Hard Prompts | — | 1435 |
Math Grok 4.1 leads
GPT-5.1-Codex: 30.3 (#235), Grok 4.1: 38.9 (#120)
| Benchmark | GPT-5.1-Codex | Grok 4.1 |
|---|---|---|
| ProofBench | 9% | — |
| LMArena Math | — | 1422 |
Knowledge Not comparable
GPT-5.1-Codex: —, Grok 4.1: 39.5 (#133)
| Benchmark | GPT-5.1-Codex | Grok 4.1 |
|---|---|---|
| LMArena Expert | — | 1417 |
Multilingual Not comparable
GPT-5.1-Codex: —, Grok 4.1: 53.4 (#68)
| Benchmark | GPT-5.1-Codex | Grok 4.1 |
|---|---|---|
| LMArena Non-English | — | 1425 |
| LMArena Chinese | — | 1465 |
| LMArena French | — | 1448 |
| LMArena German | — | 1446 |
| LMArena Japanese | — | 1397 |
| LMArena Korean | — | 1407 |
| LMArena Russian | — | 1434 |
| LMArena Spanish | — | 1438 |
Instruction Following Not comparable
GPT-5.1-Codex: —, Grok 4.1: 73.8 (#111)
| Benchmark | GPT-5.1-Codex | Grok 4.1 |
|---|---|---|
| LMArena Instruction Following | — | 1400 |
Long Context Not comparable
GPT-5.1-Codex: —, Grok 4.1: 43.2 (#100)
| Benchmark | GPT-5.1-Codex | Grok 4.1 |
|---|---|---|
| LMArena Longer Query | — | 1416 |
Writing & Preference Not comparable
GPT-5.1-Codex: —, Grok 4.1: 62.4 (#75)
| Benchmark | GPT-5.1-Codex | Grok 4.1 |
|---|---|---|
| LMArena Text | — | 1437 |
| LMArena Creative Writing | — | 1411 |
| LMArena Multi-Turn | — | 1437 |
Frequently asked questions
Is GPT-5.1-Codex better than Grok 4.1?
Grok 4.1 is the stronger model overall, scoring 41.5 to 38.6 on the Noometry Index.
Is GPT-5.1-Codex or Grok 4.1 better for coding?
GPT-5.1-Codex scores higher on coding benchmarks: 41.9 versus 33.7 in the Noometry coding category.
How many benchmarks do GPT-5.1-Codex and Grok 4.1 share?
1 benchmark has published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and Grok 4.1 has 19.