# GPT-5-Codex vs Grok-2 (Dec 2024)

> GPT-5-Codex is the stronger model overall, scoring 37.9 to 33.7 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-codex-vs-grok-2
- Last updated: 2026-10-11
- Shared benchmarks: 1

## Summary

- They share 1 benchmark with published results for both. GPT-5-Codex scores higher in 2 categories and Grok-2 (Dec 2024) in 0 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5-Codex leads 30.9 to 16.9.
- The biggest single-benchmark swing is WeirdML: 54.5% for GPT-5-Codex and 22.2% for Grok-2 (Dec 2024).

## Snapshot

| | GPT-5-Codex | Grok-2 (Dec 2024) |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 37.9 | 33.7 |
| Rank | 192 | 239 |
| Context | 400K | — |
| Input $/M | $1.25 | — |
| Output $/M | $10 | — |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5-Codex: 42.4 (#103)
- Grok-2 (Dec 2024): 33.3 (#258)

| Benchmark | GPT-5-Codex | Grok-2 (Dec 2024) |
|---|---|---|
| WeirdML | 54.5% | 22.2% |
| LiveBench Coding | — | 46.4% |
| LMArena Coding | — | 1287 |

## Agentic & Tool Use

- GPT-5-Codex: 31.0 (#72)
- Grok-2 (Dec 2024): —

| Benchmark | GPT-5-Codex | Grok-2 (Dec 2024) |
|---|---|---|
| Terminal-Bench | 44.3% | — |

## Reasoning

- GPT-5-Codex: 30.9 (#83)
- Grok-2 (Dec 2024): 16.9 (#299)

| Benchmark | GPT-5-Codex | Grok-2 (Dec 2024) |
|---|---|---|
| SimpleBench | — | 22.7% |
| Kagi LLM Benchmark | 70.3% | — |
| LiveBench Reasoning | — | 54.8% |
| LMArena Hard Prompts | — | 1272 |
| DTBench | — | 65.2% |
| LiveBench Data Analysis | — | 54.5% |
| Epoch Capabilities Index | — | 130.48 |
| LiveBench | — | 54.3% |

## Math

- GPT-5-Codex: —
- Grok-2 (Dec 2024): 20.8 (#284)

| Benchmark | GPT-5-Codex | Grok-2 (Dec 2024) |
|---|---|---|
| OTIS Mock AIME 2024-2025 | — | 11.5% |
| LiveBench Math | — | 54.9% |
| LMArena Math | — | 1283 |
| MATH Level 5 | — | 63.5% |
| FrontierMath (Feb 2025 set) | — | 0.7% |

## Knowledge

- GPT-5-Codex: —
- Grok-2 (Dec 2024): 29.8 (#233)

| Benchmark | GPT-5-Codex | Grok-2 (Dec 2024) |
|---|---|---|
| GPQA Diamond | — | 53.8% |
| Confabulations | — | 20.1% |
| LMArena Expert | — | 1254 |

## Multilingual

- GPT-5-Codex: —
- Grok-2 (Dec 2024): 43.1 (#188)

| Benchmark | GPT-5-Codex | Grok-2 (Dec 2024) |
|---|---|---|
| LMArena Non-English | — | 1282 |
| LMArena Chinese | — | 1289 |
| LMArena French | — | 1318 |
| LMArena German | — | 1287 |
| LMArena Japanese | — | 1244 |
| LMArena Korean | — | 1237 |
| LMArena Russian | — | 1286 |
| LMArena Spanish | — | 1281 |

## Instruction Following

- GPT-5-Codex: —
- Grok-2 (Dec 2024): 66.9 (#202)

| Benchmark | GPT-5-Codex | Grok-2 (Dec 2024) |
|---|---|---|
| LiveBench Instruction Following | — | 69.6% |
| LMArena Instruction Following | — | 1270 |

## Long Context

- GPT-5-Codex: —
- Grok-2 (Dec 2024): 38.8 (#190)

| Benchmark | GPT-5-Codex | Grok-2 (Dec 2024) |
|---|---|---|
| LMArena Longer Query | — | 1276 |

## Writing & Preference

- GPT-5-Codex: —
- Grok-2 (Dec 2024): 48.6 (#198)

| Benchmark | GPT-5-Codex | Grok-2 (Dec 2024) |
|---|---|---|
| LMArena Text | — | 1305 |
| LMArena Creative Writing | — | 1284 |
| Short-Story Creative Writing | — | 63.6% |
| LMArena Multi-Turn | — | 1290 |
| LiveBench Language | — | 45.6% |

## FAQ

### Is GPT-5-Codex better than Grok-2 (Dec 2024)?

GPT-5-Codex is the stronger model overall, scoring 37.9 to 33.7 on the Noometry Index.

### Is GPT-5-Codex or Grok-2 (Dec 2024) better for coding?

GPT-5-Codex scores higher on coding benchmarks: 42.4 versus 33.3 in the Noometry coding category.

### How many benchmarks do GPT-5-Codex and Grok-2 (Dec 2024) share?

1 benchmark has published results for both models. GPT-5-Codex has 3 scored results on Noometry and Grok-2 (Dec 2024) has 34.