Model comparison
GPT-5.3 Codex vs Grok 4.1
GPT-5.3 Codex is the stronger model overall, scoring 45.5 to 40.8 on the Noometry Index.
Last verified . 1 shared benchmarks.
Summary
- They share 1 benchmark with published results for both. GPT-5.3 Codex scores higher in 2 categories and Grok 4.1 in 0 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in coding, where GPT-5.3 Codex leads 48.5 to 33.4.
Side by side
| GPT-5.3 Codex | Grok 4.1 | |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 45.5 | 40.8 |
| Released | 2026-02-05 | 2025-11-17 |
| Weights | Proprietary | Proprietary |
| Context window | 400K | — |
| Max output | 128K | — |
| Input $ / M tokens | $1.75 | — |
| Output $ / M tokens | $14 | — |
| Results tracked | 8 | 19 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding GPT-5.3 Codex leads
GPT-5.3 Codex: 48.5 (#51), Grok 4.1: 33.4 (#246)
| Benchmark | GPT-5.3 Codex | Grok 4.1 |
|---|---|---|
| LMArena WebDev | 1408 | 1214 |
| SWE-bench Verified | 74.8% | — |
| WeirdML | 79.3% | — |
| LMArena Coding | — | 1445 |
| ALE-Bench | 1,655 | — |
Agentic & Tool Use GPT-5.3 Codex leads
GPT-5.3 Codex: 47.8 (#9), Grok 4.1: 33.8 (#47)
| Benchmark | GPT-5.3 Codex | Grok 4.1 |
|---|---|---|
| Terminal-Bench | 78.4% | — |
| Cybench | — | 39% |
| METR Time Horizons | 74.5% | — |
| Vending-Bench 2 | 5,940 | — |
Reasoning Not comparable
GPT-5.3 Codex: —, Grok 4.1: 28.3 (#91)
| Benchmark | GPT-5.3 Codex | Grok 4.1 |
|---|---|---|
| LMArena Hard Prompts | — | 1436 |
| Epoch Capabilities Index | 156.84 | — |
Math Not comparable
GPT-5.3 Codex: —, Grok 4.1: 36.2 (#124)
| Benchmark | GPT-5.3 Codex | Grok 4.1 |
|---|---|---|
| LMArena Math | — | 1422 |
Knowledge Not comparable
GPT-5.3 Codex: —, Grok 4.1: 38.9 (#129)
| Benchmark | GPT-5.3 Codex | Grok 4.1 |
|---|---|---|
| LMArena Expert | — | 1417 |
Multilingual Not comparable
GPT-5.3 Codex: —, Grok 4.1: 53.6 (#64)
| Benchmark | GPT-5.3 Codex | Grok 4.1 |
|---|---|---|
| LMArena Non-English | — | 1425 |
| LMArena Chinese | — | 1464 |
| LMArena French | — | 1448 |
| LMArena German | — | 1447 |
| LMArena Japanese | — | 1396 |
| LMArena Korean | — | 1407 |
| LMArena Russian | — | 1434 |
| LMArena Spanish | — | 1438 |
Instruction Following Not comparable
GPT-5.3 Codex: —, Grok 4.1: 74.0 (#106)
| Benchmark | GPT-5.3 Codex | Grok 4.1 |
|---|---|---|
| LMArena Instruction Following | — | 1400 |
Long Context Not comparable
GPT-5.3 Codex: —, Grok 4.1: 43.2 (#96)
| Benchmark | GPT-5.3 Codex | Grok 4.1 |
|---|---|---|
| LMArena Longer Query | — | 1416 |
Writing & Preference Not comparable
GPT-5.3 Codex: —, Grok 4.1: 62.6 (#71)
| Benchmark | GPT-5.3 Codex | Grok 4.1 |
|---|---|---|
| LMArena Text | — | 1437 |
| LMArena Creative Writing | — | 1411 |
| LMArena Multi-Turn | — | 1438 |
Frequently asked questions
Is GPT-5.3 Codex better than Grok 4.1?
GPT-5.3 Codex is the stronger model overall, scoring 45.5 to 40.8 on the Noometry Index.
Is GPT-5.3 Codex or Grok 4.1 better for coding?
GPT-5.3 Codex scores higher on coding benchmarks: 48.5 versus 33.4 in the Noometry coding category.
How many benchmarks do GPT-5.3 Codex and Grok 4.1 share?
1 benchmark has published results for both models. GPT-5.3 Codex has 8 scored results on Noometry and Grok 4.1 has 19.