# GPT-5.3 Codex vs Magistral Small

> GPT-5.3 Codex is the stronger model overall, scoring 45.8 to 30.2 on the Noometry Index. Magistral Small costs 6.4× less per token, which makes it the better buy when GPT-5.3 Codex's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gpt-5-3-codex-vs-magistral-small
- Last updated: 2026-10-11
- Shared benchmarks: 1

## Summary

- They share 1 benchmark with published results for both. GPT-5.3 Codex scores higher in 1 category and Magistral Small in 0 categories; one gap is clear of the uncertainty.
- The widest gap is in coding, where GPT-5.3 Codex leads 48.6 to 38.4.
- Magistral Small is cheaper at $0.50 / $1.50 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Codex.
- GPT-5.3 Codex accepts more context: 400K tokens versus 128K.
- Magistral Small has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.3 Codex | Magistral Small |
|---|---|---|
| Provider | OpenAI | Mistral AI |
| Noometry Index | 45.8 | 30.2 |
| Rank | 69 | 296 |
| Context | 400K | 128K |
| Input $/M | $1.75 | $0.50 |
| Output $/M | $14 | $1.50 |
| Weights | Proprietary | Open |

## Coding

- GPT-5.3 Codex: 48.6 (#56)
- Magistral Small: 38.4 (#176)

| Benchmark | GPT-5.3 Codex | Magistral Small |
|---|---|---|
| SWE-bench Verified | 74.8% | — |
| LMArena WebDev | 1409 | — |
| SciCode | — | 35.2% |
| WeirdML | 79.3% | — |
| ALE-Bench | 1,655 | — |

## Agentic & Tool Use

- GPT-5.3 Codex: 48.0 (#9)
- Magistral Small: —

| Benchmark | GPT-5.3 Codex | Magistral Small |
|---|---|---|
| Terminal-Bench | 78.4% | — |
| METR Time Horizons | 74.5% | — |
| Vending-Bench 2 | 5,940 | — |

## Reasoning

- GPT-5.3 Codex: —
- Magistral Small: 6.8 (#350)

| Benchmark | GPT-5.3 Codex | Magistral Small |
|---|---|---|
| Epoch Capabilities Index | 156.77 | 133.19 |
| ARC-AGI-2 | — | 0% |
| Kagi LLM Benchmark | — | 6.3% |
| ARC-AGI-1 | — | 5% |
| CritPt | — | 0.3% |
| Chess Puzzles | — | 3% |
| DTBench | — | 61.3% |

## Math

- GPT-5.3 Codex: —
- Magistral Small: 26.2 (#261)

| Benchmark | GPT-5.3 Codex | Magistral Small |
|---|---|---|
| OTIS Mock AIME 2024-2025 | — | 30% |

## Knowledge

- GPT-5.3 Codex: —
- Magistral Small: 30.9 (#223)

| Benchmark | GPT-5.3 Codex | Magistral Small |
|---|---|---|
| GPQA Diamond | — | 56.1% |

## FAQ

### Is GPT-5.3 Codex better than Magistral Small?

GPT-5.3 Codex is the stronger model overall, scoring 45.8 to 30.2 on the Noometry Index. Magistral Small costs 6.4× less per token, which makes it the better buy when GPT-5.3 Codex's lead doesn't matter for your workload.

### Which is cheaper, GPT-5.3 Codex or Magistral Small?

Magistral Small is cheaper. It lists at $0.50 per million input tokens and $1.50 per million output tokens; GPT-5.3 Codex lists at $1.75 and $14.

### Is GPT-5.3 Codex or Magistral Small better for coding?

GPT-5.3 Codex scores higher on coding benchmarks: 48.6 versus 38.4 in the Noometry coding category.

### Which has the bigger context window?

GPT-5.3 Codex does, with 400K tokens against 128K.

### How many benchmarks do GPT-5.3 Codex and Magistral Small share?

1 benchmark has published results for both models. GPT-5.3 Codex has 8 scored results on Noometry and Magistral Small has 10.