Model comparison
GPT-5.3 Codex vs Laguna M.1
GPT-5.3 Codex is the stronger model overall, scoring 45.8 to 32.5 on the Noometry Index.
Last verified . 1 shared benchmarks.
PoolsideSummary
- 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 48.6 to 36.6.
- GPT-5.3 Codex accepts more context: 400K tokens versus 262K.
- Laguna M.1 has downloadable open weights; the other is API-only.
Side by side
| GPT-5.3 Codex | Laguna M.1 | |
|---|---|---|
| Provider | OpenAI | Poolside |
| Noometry Index | 45.8 | 32.5 |
| Released | 2026-02-05 | 2026-04-28 |
| Weights | Proprietary | Open |
| Context window | 400K | 262K |
| Max output | 128K | 33K |
| Input $ / M tokens | $1.75 | — |
| Output $ / M tokens | $14 | — |
| Results tracked | 8 | 3 |
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Category by category
Coding GPT-5.3 Codex leads
GPT-5.3 Codex: 48.6 (#56), Laguna M.1: 36.6 (#204)
| Benchmark | GPT-5.3 Codex | Laguna M.1 |
|---|---|---|
| LMArena WebDev | 1409 | 1349 |
| SWE-bench Verified | 74.8% | — |
| WeirdML | 79.3% | — |
| ALE-Bench | 1,655 | — |
Agentic & Tool Use Not comparable
GPT-5.3 Codex: 48.0 (#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 Not comparable
GPT-5.3 Codex: —, Laguna M.1: 23.1 (#184)
| Benchmark | GPT-5.3 Codex | Laguna M.1 |
|---|---|---|
| Surface Evolver Bench | — | 15.6% |
| Epoch Capabilities Index | 156.77 | — |
Math Not comparable
GPT-5.3 Codex: —, Laguna M.1: 21.1 (#283)
| Benchmark | GPT-5.3 Codex | Laguna M.1 |
|---|---|---|
| ProofBench | — | 0% |
Frequently asked questions
Is GPT-5.3 Codex better than Laguna M.1?
GPT-5.3 Codex is the stronger model overall, scoring 45.8 to 32.5 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: 48.6 versus 36.6 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.