# GPT-5-Codex vs Llama 13b

> GPT-5-Codex is the stronger model overall, scoring 37.9 to 24.4 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-codex-vs-llama-13b
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in coding, where GPT-5-Codex leads 42.4 to 21.4.
- Llama 13b has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5-Codex | Llama 13b |
|---|---|---|
| Provider | OpenAI | Meta |
| Noometry Index | 37.9 | 24.4 |
| Rank | 192 | 348 |
| Context | 400K | — |
| Input $/M | $1.25 | — |
| Output $/M | $10 | — |
| Weights | Proprietary | Open |

## Coding

- GPT-5-Codex: 42.4 (#103)
- Llama 13b: 21.4 (#337)

| Benchmark | GPT-5-Codex | Llama 13b |
|---|---|---|
| WeirdML | 54.5% | — |
| LMArena Coding | — | 683 |

## Agentic & Tool Use

- GPT-5-Codex: 31.0 (#72)
- Llama 13b: —

| Benchmark | GPT-5-Codex | Llama 13b |
|---|---|---|
| Terminal-Bench | 44.3% | — |

## Reasoning

- GPT-5-Codex: 30.9 (#83)
- Llama 13b: 14.0 (#329)

| Benchmark | GPT-5-Codex | Llama 13b |
|---|---|---|
| Kagi LLM Benchmark | 70.3% | — |
| LMArena Hard Prompts | — | 728 |
| BIG-Bench Hard | — | 37.9% |
| Epoch Capabilities Index | — | 100.58 |
| HellaSwag | — | 79.2% |
| LAMBADA | — | 75.2% |
| PIQA | — | 80.1% |
| WinoGrande | — | 73% |

## Math

- GPT-5-Codex: —
- Llama 13b: 26.7 (#256)

| Benchmark | GPT-5-Codex | Llama 13b |
|---|---|---|
| LMArena Math | — | 838 |
| GSM8K | — | 20.6% |

## Knowledge

- GPT-5-Codex: —
- Llama 13b: —

| Benchmark | GPT-5-Codex | Llama 13b |
|---|---|---|
| ARC (AI2) Challenge | — | 52.7% |
| BoolQ | — | 78.7% |
| MMLU | — | 47.7% |
| OpenBookQA | — | 56.4% |
| TriviaQA | — | 77.9% |

## Multimodal

- GPT-5-Codex: —
- Llama 13b: —

| Benchmark | GPT-5-Codex | Llama 13b |
|---|---|---|
| ScienceQA | — | 43.3% |

## Multilingual

- GPT-5-Codex: —
- Llama 13b: 16.6 (#297)

| Benchmark | GPT-5-Codex | Llama 13b |
|---|---|---|
| LMArena Non-English | — | 819 |

## Instruction Following

- GPT-5-Codex: —
- Llama 13b: 36.7 (#305)

| Benchmark | GPT-5-Codex | Llama 13b |
|---|---|---|
| LMArena Instruction Following | — | 781 |

## Writing & Preference

- GPT-5-Codex: —
- Llama 13b: 13.8 (#312)

| Benchmark | GPT-5-Codex | Llama 13b |
|---|---|---|
| LMArena Text | — | 834 |
| LMArena Creative Writing | — | 794 |
| LMArena Multi-Turn | — | 753 |

## FAQ

### Is GPT-5-Codex better than Llama 13b?

GPT-5-Codex is the stronger model overall, scoring 37.9 to 24.4 on the Noometry Index.

### Is GPT-5-Codex or Llama 13b better for coding?

GPT-5-Codex scores higher on coding benchmarks: 42.4 versus 21.4 in the Noometry coding category.

### How many benchmarks do GPT-5-Codex and Llama 13b share?

0 benchmarks have published results for both models. GPT-5-Codex has 3 scored results on Noometry and Llama 13b has 21.