# GPT-5.2-Codex vs GPT-5.3 Codex

> Side-by-side benchmark comparison for GPT-5.2-Codex and GPT-5.3 Codex across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-2-codex-vs-gpt-5-3-codex
- Last updated: October 17, 2026

- Shared sourced benchmarks: 5
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

GPT-5.3 Codex leads by point estimate. Conditional score ranges do not establish rank confidence. Choose using the category evidence and your own workload tests.

## Summary

- GPT-5.3 Codex has the higher overall point estimate 60.48 to 55.3. Conditional score ranges do not establish rank confidence.
- The clearest category separation is in agentic, where the averages are 40.8 for GPT-5.2-Codex and 55.5 for GPT-5.3 Codex.
- The biggest single benchmark swing is Vibe Code Bench in Coding, with scores of 37.91% and 61.77%.

## Model Snapshot

| Property | GPT-5.2-Codex | GPT-5.3 Codex |
|----------|----------|----------|
| Creator | OpenAI | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 400K | 400K |
| Overall Score | 55.3 | 60.48 |
| Benchmarks Covered | 5 | 11 |
| Pricing (input/output) | $1.75 / $14.00 | $1.75 / $14.00 |

## Category Breakdown

### Agentic

- Winner: Directional only
- GPT-5.2-Codex public-lane score: 40.8 (Estimated · #64/128)
- GPT-5.3 Codex public-lane score: 55.5 (Estimated · #41/128)

| Benchmark | GPT-5.2-Codex | GPT-5.3 Codex | Winner |
|-----------|-----------|-----------|--------|
| Gert Labs | 51.79% | 57.47% | GPT-5.3 Codex |
| JobBench | 26.0% | 33.7% | GPT-5.3 Codex |
| Terminal-Bench 2.0 | Coming soon | 77.3% | Coming soon |
| OSWorld-Verified | Coming soon | 64.7% | Coming soon |

### Coding

- Winner: GPT-5.3 Codex
- GPT-5.2-Codex public-lane score: 43.7 (Supported · #56/150)
- GPT-5.3 Codex public-lane score: 53.5 (Supported · #35/150)

| Benchmark | GPT-5.2-Codex | GPT-5.3 Codex | Winner |
|-----------|-----------|-----------|--------|
| Vibe Code Bench | 37.91% | 61.77% | GPT-5.3 Codex |
| LiveCodeBench (Vals) | 88.0% | 87.3% | GPT-5.2-Codex |
| SWE-bench (Vals) | 72.4% | 78.0% | GPT-5.3 Codex |
| SWE-bench Verified | Coming soon | 85% | Coming soon |
| SWE-bench Pro | Coming soon | 56.8% | Coming soon |
| SWE-Rebench | Coming soon | 58.2% | Coming soon |
| Terminal-Bench 2.0 | Coming soon | 77.3% | Coming soon |

### Reasoning

- Winner: Not comparable
- GPT-5.2-Codex public-lane score: 82.4 (Unranked · 2 rankable rows)
- GPT-5.3 Codex public-lane score: 83.1 (Unranked · 2 rankable rows)

### Multimodal & Grounded

- Winner: Not comparable
- GPT-5.2-Codex public-lane score: 76.9 (Unranked · 1 rankable row)
- GPT-5.3 Codex public-lane score: 80.1 (Unranked · 1 rankable row)

### Knowledge

- Winner: Directional only
- GPT-5.2-Codex public-lane score: 56.4 (Estimated · #54/184)
- GPT-5.3 Codex public-lane score: 65.4 (Estimated · #33/184)

### Instruction Following

- Winner: Directional only
- GPT-5.2-Codex public-lane score: 93.8 (#4/148)
- GPT-5.3 Codex public-lane score: 92.6 (#18/148)

## FAQ

### Which is better overall, GPT-5.2-Codex or GPT-5.3 Codex?

GPT-5.3 Codex has the higher overall point estimate. Conditional score ranges do not establish rank confidence.

### Where is the biggest gap between GPT-5.2-Codex and GPT-5.3 Codex?

The widest category gap is in agentic, where the averages are 40.8 for GPT-5.2-Codex and 55.5 for GPT-5.3 Codex.

### How many benchmarks does GPT-5.2-Codex cover on BenchLM?

GPT-5.2-Codex currently has 5 sourced benchmark scores on BenchLM.

### How many benchmarks does GPT-5.3 Codex cover on BenchLM?

GPT-5.3 Codex currently has 11 sourced benchmark scores on BenchLM.

## Related Comparisons

- [GPT-5.2-Codex vs GPT-5.3-Codex-Spark](/compare/gpt-5-2-codex-vs-gpt-5-3-codex-spark)
- [GPT-5.3 Codex vs GPT-5.3-Codex-Spark](/compare/gpt-5-3-codex-vs-gpt-5-3-codex-spark)
- [GPT-5.2-Codex vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-gpt-5-2-codex)
- [GPT-5.3 Codex vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-gpt-5-3-codex)

## Explore More

- [GPT-5.2-Codex profile](/models/gpt-5-2-codex)
- [GPT-5.3 Codex profile](/models/gpt-5-3-codex)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)