# GPT-5.1-Codex vs GPT-5.2-Codex

> Side-by-side benchmark comparison for GPT-5.1-Codex and GPT-5.2-Codex across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

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

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

## Quick Verdict

Evidence is too thin for a benchmark verdict: GPT-5.1-Codex and GPT-5.2-Codex 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.
- GPT-5.1-Codex has the lower published output-token price.

## Model Snapshot

| Property | GPT-5.1-Codex | GPT-5.2-Codex |
|----------|----------|----------|
| Creator | OpenAI | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 400K | 400K |
| Independent public score (not head-to-head) | 51.62 | 56.38 |
| Benchmarks Covered | 3 | 3 |
| Pricing (input/output) | $1.25 / $10.00 | $1.75 / $14.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- GPT-5.1-Codex public-lane score: 51.4 (Estimated · #54/151)
- GPT-5.2-Codex public-lane score: 52.4 (Estimated · #46/151)

| Benchmark | GPT-5.1-Codex | GPT-5.2-Codex | Winner |
|-----------|-----------|-----------|--------|
| Gert Labs | 49.68% | 51.79% | GPT-5.2-Codex |
| JobBench | 26.2% | 26.0% | GPT-5.1-Codex |

### Coding

- Winner: Insufficient shared evidence
- GPT-5.1-Codex public-lane score: 47.4 (Estimated · #89/183)
- GPT-5.2-Codex public-lane score: 52.5 (Supported · #54/183)

| Benchmark | GPT-5.1-Codex | GPT-5.2-Codex | Winner |
|-----------|-----------|-----------|--------|
| Vibe Code Bench | 13.12% | 37.91% | GPT-5.2-Codex |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- GPT-5.1-Codex public-lane score: 66.8 (Unranked · 1 rankable row)
- GPT-5.2-Codex public-lane score: 72.4 (Unranked · 1 rankable row)

### Reasoning

- Winner: Insufficient shared evidence
- GPT-5.1-Codex public-lane score: 70.6 (Unranked · 2 rankable rows)
- GPT-5.2-Codex public-lane score: 78 (Unranked · 2 rankable rows)

### Knowledge

- Winner: Insufficient shared evidence
- GPT-5.1-Codex public-lane score: 53.3 (Estimated · #69/181)
- GPT-5.2-Codex public-lane score: 57.8 (Estimated · #46/181)

### Instruction Following

- Winner: Insufficient shared evidence
- GPT-5.1-Codex public-lane score: 85.3 (#42/120)
- GPT-5.2-Codex public-lane score: 93.5 (#3/120)

## FAQ

### Is there enough evidence to pick between GPT-5.1-Codex and GPT-5.2-Codex?

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-5.1-Codex vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-gpt-5-1-codex)
- [GPT-5.2-Codex vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-gpt-5-2-codex)
- [GPT-5.1-Codex vs GPT-6 Astra](/compare/gpt-5-1-codex-vs-gpt-6-astra)
- [GPT-5.2-Codex vs GPT-6 Astra](/compare/gpt-5-2-codex-vs-gpt-6-astra)

## Explore More

- [GPT-5.1-Codex profile](/models/gpt-5-1-codex)
- [GPT-5.2-Codex profile](/models/gpt-5-2-codex)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)