# GPT-5.3 Codex vs Laguna S 2.1

> Side-by-side benchmark comparison for GPT-5.3 Codex and Laguna S 2.1 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-3-codex-vs-laguna-s-2-1
- Last updated: September 4, 2026

- Shared sourced benchmarks: 2
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Evidence is too thin for a benchmark verdict: GPT-5.3 Codex and Laguna S 2.1 share only 2 sourced benchmark rows.

## Summary

- Only 2 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 S 2.1 has the lower published output-token price.
- Laguna S 2.1 has the larger published context window at 1M.

## Model Snapshot

| Property | GPT-5.3 Codex | Laguna S 2.1 |
|----------|----------|----------|
| Creator | OpenAI | Poolside |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 400K | 1M |
| Independent public score (not head-to-head) | 65.22 | null |
| Benchmarks Covered | 8 | 6 |
| Pricing (input/output) | $1.75 / $14.00 | $0.10 / $0.20 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 62.3 (Estimated · #19/151)
- Laguna S 2.1 public-lane score: 48.2 (Estimated · #77/151)

| Benchmark | GPT-5.3 Codex | Laguna S 2.1 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 77.3% | 70.2% | 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 |
| Toolathlon-Verified | Coming soon | 49.7% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 62.7 (Supported · #16/183)
- Laguna S 2.1 public-lane score: 47.8 (Estimated · #87/183)

| Benchmark | GPT-5.3 Codex | Laguna S 2.1 | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 85% | Coming soon | Coming soon |
| SWE-bench Pro | 56.8% | 59.4% | Laguna S 2.1 |
| SWE-Rebench | 58.2% | Coming soon | Coming soon |
| Vibe Code Bench | 61.77% | Coming soon | Coming soon |
| Terminal-Bench 2.0 | Coming soon | 70.2% | Coming soon |
| SWE Multilingual | Coming soon | 78.5% | Coming soon |
| deepSwe | Coming soon | 40.4% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 75.4 (Unranked · 1 rankable row)
- Laguna S 2.1 public-lane score: Coming soon

### Reasoning

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 77.3 (Unranked · 2 rankable rows)
- Laguna S 2.1 public-lane score: Coming soon

### Knowledge

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 66.3 (Estimated · #22/181)
- Laguna S 2.1 public-lane score: Coming soon

### Instruction Following

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 92.3 (#15/120)
- Laguna S 2.1 public-lane score: Coming soon

## FAQ

### Is there enough evidence to pick between GPT-5.3 Codex and Laguna S 2.1?

Not yet. The models share only 2 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 S 2.1 vs GPT-5.3-Codex-Spark](/compare/gpt-5-3-codex-spark-vs-laguna-s-2-1)
- [GPT-5.3 Codex vs Laguna M.1](/compare/gpt-5-3-codex-vs-laguna-m-1)
- [Laguna S 2.1 vs Laguna M.1](/compare/laguna-m-1-vs-laguna-s-2-1)

## Explore More

- [GPT-5.3 Codex profile](/models/gpt-5-3-codex)
- [Laguna S 2.1 profile](/models/laguna-s-2-1)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)