# GPT-5.1-Codex vs o1-pro

> GPT-5.1-Codex is the stronger model overall, scoring 38.2 to 31.2 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-1-codex-vs-o1-pro
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- GPT-5.1-Codex is cheaper at $1.25 / $10 per million input/output tokens, against $150 / $600 for o1-pro.
- GPT-5.1-Codex accepts more context: 400K tokens versus 200K.

## Snapshot

| | GPT-5.1-Codex | o1-pro |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 38.2 | 31.2 |
| Rank | 178 | 264 |
| Context | 400K | 200K |
| Input $/M | $1.25 | $150 |
| Output $/M | $10 | $600 |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5.1-Codex: 41.7 (#107)
- o1-pro: —

| Benchmark | GPT-5.1-Codex | o1-pro |
|---|---|---|
| SWE-bench Verified (bash only) | 66% | — |
| LMArena WebDev | 1337 | — |
| ALE-Bench | 1,245 | — |

## Agentic & Tool Use

- GPT-5.1-Codex: 37.8 (#32)
- o1-pro: —

| Benchmark | GPT-5.1-Codex | o1-pro |
|---|---|---|
| Terminal-Bench | 60.4% | — |
| METR Time Horizons | 70.8% | — |

## Reasoning

- GPT-5.1-Codex: —
- o1-pro: 20.2 (#223)

| Benchmark | GPT-5.1-Codex | o1-pro |
|---|---|---|
| ARC-AGI-1 | — | 23.3% |
| EnigmaEval | — | 6.1% |

## Math

- GPT-5.1-Codex: 29.3 (#218)
- o1-pro: —

| Benchmark | GPT-5.1-Codex | o1-pro |
|---|---|---|
| ProofBench | 9% | — |

## Knowledge

- GPT-5.1-Codex: —
- o1-pro: 29.3 (#227)

| Benchmark | GPT-5.1-Codex | o1-pro |
|---|---|---|
| Humanity's Last Exam | — | 8.1% |

## FAQ

### Is GPT-5.1-Codex better than o1-pro?

GPT-5.1-Codex is the stronger model overall, scoring 38.2 to 31.2 on the Noometry Index.

### Which is cheaper, GPT-5.1-Codex or o1-pro?

GPT-5.1-Codex is cheaper. It lists at $1.25 per million input tokens and $10 per million output tokens; o1-pro lists at $150 and $600.

### Which has the bigger context window?

GPT-5.1-Codex does, with 400K tokens against 200K.

### How many benchmarks do GPT-5.1-Codex and o1-pro share?

0 benchmarks have published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and o1-pro has 3.