# GPT-5.1-Codex vs Kimi K2.7 Code

> Kimi K2.7 Code is the stronger model overall, scoring 43.0 to 38.2 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-1-codex-vs-kimi-k2-7-code
- Last updated: 2026-10-10
- Shared benchmarks: 2

## Summary

- They share 2 benchmarks with published results for both. GPT-5.1-Codex scores higher in 1 category and Kimi K2.7 Code in 2 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in math, where Kimi K2.7 Code leads 52.6 to 29.3.
- Kimi K2.7 Code is cheaper at $0.95 / $4 per million input/output tokens, against $1.25 / $10 for GPT-5.1-Codex.
- GPT-5.1-Codex accepts more context: 400K tokens versus 262K.
- Kimi K2.7 Code has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.1-Codex | Kimi K2.7 Code |
|---|---|---|
| Provider | OpenAI | Moonshot AI |
| Noometry Index | 38.2 | 43.0 |
| Rank | 178 | 90 |
| Context | 400K | 262K |
| Input $/M | $1.25 | $0.95 |
| Output $/M | $10 | $4 |
| Weights | Proprietary | Open |

## Coding

- GPT-5.1-Codex: 41.7 (#107)
- Kimi K2.7 Code: 42.4 (#92)

| Benchmark | GPT-5.1-Codex | Kimi K2.7 Code |
|---|---|---|
| LMArena WebDev | 1337 | 1473 |
| ALE-Bench | 1,245 | 886.23 |
| DeepSWE | — | 30.5% |
| FrontierCode | — | 30.1% |
| SWE-bench Verified (bash only) | 66% | — |
| SciCode | — | 47.5% |
| WeirdML | — | 54.1% |

## Agentic & Tool Use

- GPT-5.1-Codex: 37.8 (#32)
- Kimi K2.7 Code: 23.9 (#115)

| Benchmark | GPT-5.1-Codex | Kimi K2.7 Code |
|---|---|---|
| Terminal-Bench | 60.4% | — |
| APEX-Agents | — | 37.6% |
| GBAEval | — | 0.9% |
| METR Time Horizons | 70.8% | — |
| Vending-Bench 2 | — | 5,083 |

## Reasoning

- GPT-5.1-Codex: —
- Kimi K2.7 Code: 38.2 (#56)

| Benchmark | GPT-5.1-Codex | Kimi K2.7 Code |
|---|---|---|
| SimpleBench | — | 57.9% |
| CritPt | — | 10% |
| Chess Puzzles | — | 21% |
| Surface Evolver Bench | — | 48.8% |
| Epoch Capabilities Index | — | 150.01 |

## Math

- GPT-5.1-Codex: 29.3 (#218)
- Kimi K2.7 Code: 52.6 (#39)

| Benchmark | GPT-5.1-Codex | Kimi K2.7 Code |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 54% |
| FrontierMath Tier 4 | — | 12.2% |
| OTIS Mock AIME 2024-2025 | — | 95.6% |
| ProofBench | 9% | — |

## Knowledge

- GPT-5.1-Codex: —
- Kimi K2.7 Code: 53.6 (#51)

| Benchmark | GPT-5.1-Codex | Kimi K2.7 Code |
|---|---|---|
| GPQA Diamond | — | 87.9% |
| SimpleQA Verified | — | 36.5% |

## FAQ

### Is GPT-5.1-Codex better than Kimi K2.7 Code?

Kimi K2.7 Code is the stronger model overall, scoring 43.0 to 38.2 on the Noometry Index.

### Which is cheaper, GPT-5.1-Codex or Kimi K2.7 Code?

Kimi K2.7 Code is cheaper. It lists at $0.95 per million input tokens and $4 per million output tokens; GPT-5.1-Codex lists at $1.25 and $10.

### Is GPT-5.1-Codex or Kimi K2.7 Code better for coding?

They score almost the same on coding (41.7 vs 42.4); test both on your own repository before choosing.

### Which has the bigger context window?

GPT-5.1-Codex does, with 400K tokens against 262K.

### How many benchmarks do GPT-5.1-Codex and Kimi K2.7 Code share?

2 benchmarks have published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and Kimi K2.7 Code has 19.