# GPT-5.3 Codex vs Laguna M.1

> GPT-5.3 Codex is the stronger model overall, scoring 45.5 to 31.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-3-codex-vs-laguna-m-1
- Last updated: 2026-10-10
- Shared benchmarks: 1

## Summary

- They share 1 benchmark with published results for both. GPT-5.3 Codex scores higher in 1 category and Laguna M.1 in 0 categories; one gap is clear of the uncertainty.
- The widest gap is in coding, where GPT-5.3 Codex leads 48.5 to 36.4.
- GPT-5.3 Codex accepts more context: 400K tokens versus 262K.
- Laguna M.1 has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.3 Codex | Laguna M.1 |
|---|---|---|
| Provider | OpenAI | Poolside |
| Noometry Index | 45.5 | 31.9 |
| Rank | 61 | 252 |
| Context | 400K | 262K |
| Input $/M | $1.75 | — |
| Output $/M | $14 | — |
| Weights | Proprietary | Open |

## Coding

- GPT-5.3 Codex: 48.5 (#51)
- Laguna M.1: 36.4 (#195)

| Benchmark | GPT-5.3 Codex | Laguna M.1 |
|---|---|---|
| LMArena WebDev | 1408 | 1348 |
| SWE-bench Verified | 74.8% | — |
| WeirdML | 79.3% | — |
| ALE-Bench | 1,655 | — |

## Agentic & Tool Use

- GPT-5.3 Codex: 47.8 (#9)
- Laguna M.1: —

| Benchmark | GPT-5.3 Codex | Laguna M.1 |
|---|---|---|
| Terminal-Bench | 78.4% | — |
| METR Time Horizons | 74.5% | — |
| Vending-Bench 2 | 5,940 | — |

## Reasoning

- GPT-5.3 Codex: —
- Laguna M.1: 21.9 (#187)

| Benchmark | GPT-5.3 Codex | Laguna M.1 |
|---|---|---|
| Surface Evolver Bench | — | 15.6% |
| Epoch Capabilities Index | 156.84 | — |

## Math

- GPT-5.3 Codex: —
- Laguna M.1: 20.3 (#276)

| Benchmark | GPT-5.3 Codex | Laguna M.1 |
|---|---|---|
| ProofBench | — | 0% |

## FAQ

### Is GPT-5.3 Codex better than Laguna M.1?

GPT-5.3 Codex is the stronger model overall, scoring 45.5 to 31.9 on the Noometry Index.

### Is GPT-5.3 Codex or Laguna M.1 better for coding?

GPT-5.3 Codex scores higher on coding benchmarks: 48.5 versus 36.4 in the Noometry coding category.

### Which has the bigger context window?

GPT-5.3 Codex does, with 400K tokens against 262K.

### How many benchmarks do GPT-5.3 Codex and Laguna M.1 share?

1 benchmark has published results for both models. GPT-5.3 Codex has 8 scored results on Noometry and Laguna M.1 has 3.