# GPT-5.1-Codex vs GPT-5.2 Pro

> GPT-5.2 Pro is the stronger model overall, scoring 52.3 to 38.6 on the Noometry Index. GPT-5.1-Codex costs 17× less per token, which makes it the better buy when GPT-5.2 Pro's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gpt-5-1-codex-vs-gpt-5-2-pro
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in math, where GPT-5.2 Pro leads 65.3 to 30.3.
- GPT-5.1-Codex is cheaper at $1.25 / $10 per million input/output tokens, against $21 / $168 for GPT-5.2 Pro.

## Snapshot

| | GPT-5.1-Codex | GPT-5.2 Pro |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 38.6 | 52.3 |
| Rank | 186 | 39 |
| Context | 400K | 400K |
| Input $/M | $1.25 | $21 |
| Output $/M | $10 | $168 |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5.1-Codex: 41.9 (#116)
- GPT-5.2 Pro: —

| Benchmark | GPT-5.1-Codex | GPT-5.2 Pro |
|---|---|---|
| SWE-bench Verified (bash only) | 66% | — |
| LMArena WebDev | 1337 | — |
| ALE-Bench | 1,245 | — |

## Agentic & Tool Use

- GPT-5.1-Codex: 38.0 (#33)
- GPT-5.2 Pro: —

| Benchmark | GPT-5.1-Codex | GPT-5.2 Pro |
|---|---|---|
| Terminal-Bench | 60.4% | — |
| METR Time Horizons | 70.8% | — |

## Reasoning

- GPT-5.1-Codex: —
- GPT-5.2 Pro: 51.5 (#33)

| Benchmark | GPT-5.1-Codex | GPT-5.2 Pro |
|---|---|---|
| ARC-AGI-2 | — | 54.2% |
| SimpleBench | — | 57.4% |
| NYT Connections (extended) | — | 79.3% |
| ARC-AGI-1 | — | 90.5% |
| Epoch Capabilities Index | — | 155.4 |

## Math

- GPT-5.1-Codex: 30.3 (#235)
- GPT-5.2 Pro: 65.3 (#29)

| Benchmark | GPT-5.1-Codex | GPT-5.2 Pro |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 74% |
| FrontierMath Tier 4 | — | 46% |
| ProofBench | 9% | — |
| FrontierMath Tier 4 (v1) | — | 31.3% |

## FAQ

### Is GPT-5.1-Codex better than GPT-5.2 Pro?

GPT-5.2 Pro is the stronger model overall, scoring 52.3 to 38.6 on the Noometry Index. GPT-5.1-Codex costs 17× less per token, which makes it the better buy when GPT-5.2 Pro's lead doesn't matter for your workload.

### Which is cheaper, GPT-5.1-Codex or GPT-5.2 Pro?

GPT-5.1-Codex is cheaper. It lists at $1.25 per million input tokens and $10 per million output tokens; GPT-5.2 Pro lists at $21 and $168.

### Which has the bigger context window?

Both accept 400K tokens.

### How many benchmarks do GPT-5.1-Codex and GPT-5.2 Pro share?

0 benchmarks have published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and GPT-5.2 Pro has 8.