# GPT-5.3 Codex vs Laguna M.1

> Side-by-side benchmark comparison for GPT-5.3 Codex and Laguna M.1 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-3-codex-vs-laguna-m-1
- Last updated: September 10, 2026

- Shared sourced benchmarks: 3
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Evidence is too thin for a benchmark verdict: GPT-5.3 Codex and Laguna M.1 share only 3 sourced benchmark rows.

## Summary

- Only 3 shared sourced benchmark rows are available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- Laguna M.1 has the lower published output-token price.
- GPT-5.3 Codex has the larger published context window at 400K.

## Model Snapshot

| Property | GPT-5.3 Codex | Laguna M.1 |
|----------|----------|----------|
| Creator | OpenAI | Poolside |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 400K | 256K |
| Independent public score (not head-to-head) | 64.29 | 3.93 |
| Benchmarks Covered | 8 | 10 |
| Pricing (input/output) | $1.75 / $14.00 | Pricing unavailable / Pricing unavailable |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 61.6 (Estimated · #15/152)
- Laguna M.1 public-lane score: 23.9 (Estimated · #147/152)

| Benchmark | GPT-5.3 Codex | Laguna M.1 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 77.3% | 45.8% | GPT-5.3 Codex |
| OSWorld-Verified | 64.7% | Coming soon | Coming soon |
| Gert Labs | 57.47% | Coming soon | Coming soon |
| JobBench | 33.7% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | Coming soon | 34.1% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 62 (Estimated · #17/151)
- Laguna M.1 public-lane score: 29.7 (Supported · #140/151)

| Benchmark | GPT-5.3 Codex | Laguna M.1 | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 85% | 74.6% | GPT-5.3 Codex |
| SWE-bench Pro | 56.8% | 49.2% | GPT-5.3 Codex |
| SWE-Rebench | 58.2% | Coming soon | Coming soon |
| Vibe Code Bench | 61.77% | Coming soon | Coming soon |
| SWE Multilingual | Coming soon | 63.1% | Coming soon |
| Terminal-Bench 2.0 | Coming soon | 45.8% | Coming soon |
| LiveCodeBench (Vals) | Coming soon | 68.1% | Coming soon |
| SWE-bench (Vals) | Coming soon | 57.6% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 75.6 (Unranked · 1 rankable row)
- Laguna M.1 public-lane score: Coming soon

### Reasoning

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 78.3 (Unranked · 2 rankable rows)
- Laguna M.1 public-lane score: Coming soon

### Knowledge

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 65.6 (Estimated · #23/183)
- Laguna M.1 public-lane score: 18.6 (Estimated · #182/183)

| Benchmark | GPT-5.3 Codex | Laguna M.1 | Winner |
|-----------|-----------|-----------|--------|
| GPQA Diamond (Vals) | Coming soon | 27.0% | Coming soon |
| MMLU-Pro (Vals) | Coming soon | 68.8% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 92.6 (#15/123)
- Laguna M.1 public-lane score: Coming soon

## FAQ

### Is there enough evidence to pick between GPT-5.3 Codex and Laguna M.1?

Not yet. The models share only 3 sourced benchmark rows, so this mirror reports the available measurements and metadata without naming a broad winner.

### What can I compare safely on this page?

Published pricing, context windows, model type, and individual shared benchmark rows are directly comparable. Independent overall scores and non-overlapping benchmark coverage are labeled separately and should not be read as a controlled head-to-head result.

## Related Comparisons

- [GPT-5.3 Codex vs GPT-5.3-Codex-Spark](/compare/gpt-5-3-codex-vs-gpt-5-3-codex-spark)
- [Laguna M.1 vs GPT-5.3-Codex-Spark](/compare/gpt-5-3-codex-spark-vs-laguna-m-1)
- [GPT-5.3 Codex vs Laguna XS.2](/compare/gpt-5-3-codex-vs-laguna-xs-2)
- [Laguna M.1 vs Laguna XS.2](/compare/laguna-m-1-vs-laguna-xs-2)

## Explore More

- [GPT-5.3 Codex profile](/models/gpt-5-3-codex)
- [Laguna M.1 profile](/models/laguna-m-1)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)