# GPT-5.3 Chat vs Kimi K2.7 Code

> GPT-5.3 Chat and Kimi K2.7 Code score almost the same on the Noometry Index (42.8 vs 43.3), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/gpt-5-3-chat-vs-kimi-k2-7-code
- Last updated: 2026-10-11
- Shared benchmarks: 0

## Summary

- The widest gap is in math, where Kimi K2.7 Code leads 52.9 to 38.2.
- Kimi K2.7 Code is cheaper at $0.95 / $4 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Chat.
- Kimi K2.7 Code accepts more context: 262K tokens versus 128K.
- Kimi K2.7 Code has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.3 Chat | Kimi K2.7 Code |
|---|---|---|
| Provider | OpenAI | Moonshot AI |
| Noometry Index | 42.8 | 43.3 |
| Rank | 109 | 94 |
| Context | 128K | 262K |
| Input $/M | $1.75 | $0.95 |
| Output $/M | $14 | $4 |
| Weights | Proprietary | Open |

## Coding

- GPT-5.3 Chat: 41.4 (#124)
- Kimi K2.7 Code: 42.9 (#95)

| Benchmark | GPT-5.3 Chat | Kimi K2.7 Code |
|---|---|---|
| DeepSWE | — | 30.5% |
| FrontierCode | — | 30.1% |
| LMArena WebDev | — | 1473 |
| SciCode | — | 47.5% |
| WeirdML | — | 54.1% |
| LMArena Coding | 1408 | — |
| ALE-Bench | — | 886.23 |

## Agentic & Tool Use

- GPT-5.3 Chat: —
- Kimi K2.7 Code: 24.0 (#122)

| Benchmark | GPT-5.3 Chat | Kimi K2.7 Code |
|---|---|---|
| APEX-Agents | — | 37.6% |
| GBAEval | — | 0.9% |
| Vending-Bench 2 | — | 5,083 |

## Reasoning

- GPT-5.3 Chat: 28.5 (#102)
- Kimi K2.7 Code: 39.0 (#61)

| Benchmark | GPT-5.3 Chat | Kimi K2.7 Code |
|---|---|---|
| SimpleBench | — | 57.9% |
| CritPt | — | 10% |
| Chess Puzzles | — | 21% |
| LMArena Hard Prompts | 1399 | — |
| Surface Evolver Bench | — | 48.8% |
| Epoch Capabilities Index | — | 149.97 |

## Math

- GPT-5.3 Chat: 38.2 (#142)
- Kimi K2.7 Code: 52.9 (#48)

| Benchmark | GPT-5.3 Chat | Kimi K2.7 Code |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 54% |
| FrontierMath Tier 4 | — | 12.2% |
| OTIS Mock AIME 2024-2025 | — | 95.6% |
| LMArena Math | 1389 | — |

## Knowledge

- GPT-5.3 Chat: 38.8 (#140)
- Kimi K2.7 Code: 53.5 (#57)

| Benchmark | GPT-5.3 Chat | Kimi K2.7 Code |
|---|---|---|
| GPQA Diamond | — | 87.9% |
| SimpleQA Verified | — | 36.5% |
| LMArena Expert | 1397 | — |

## Multilingual

- GPT-5.3 Chat: 50.3 (#124)
- Kimi K2.7 Code: —

| Benchmark | GPT-5.3 Chat | Kimi K2.7 Code |
|---|---|---|
| LMArena Non-English | 1382 | — |
| LMArena Chinese | 1432 | — |
| LMArena French | 1397 | — |
| LMArena German | 1384 | — |
| LMArena Japanese | 1352 | — |
| LMArena Korean | 1346 | — |
| LMArena Russian | 1400 | — |
| LMArena Spanish | 1371 | — |

## Instruction Following

- GPT-5.3 Chat: 72.8 (#129)
- Kimi K2.7 Code: —

| Benchmark | GPT-5.3 Chat | Kimi K2.7 Code |
|---|---|---|
| LMArena Instruction Following | 1378 | — |

## Long Context

- GPT-5.3 Chat: 42.6 (#120)
- Kimi K2.7 Code: —

| Benchmark | GPT-5.3 Chat | Kimi K2.7 Code |
|---|---|---|
| LMArena Longer Query | 1396 | — |

## Writing & Preference

- GPT-5.3 Chat: 63.1 (#68)
- Kimi K2.7 Code: —

| Benchmark | GPT-5.3 Chat | Kimi K2.7 Code |
|---|---|---|
| LMArena Text | 1389 | — |
| LMArena Creative Writing | 1355 | — |
| EQ-Bench Creative Writing | 1690 | — |
| LMArena Multi-Turn | 1412 | — |

## FAQ

### Is GPT-5.3 Chat better than Kimi K2.7 Code?

GPT-5.3 Chat and Kimi K2.7 Code score almost the same on the Noometry Index (42.8 vs 43.3), so choose on price, context window or the category you care about most.

### Which is cheaper, GPT-5.3 Chat 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-5.3 Chat lists at $1.75 and $14.

### Is GPT-5.3 Chat or Kimi K2.7 Code better for coding?

Kimi K2.7 Code scores higher on coding benchmarks: 42.9 versus 41.4 in the Noometry coding category.

### Which has the bigger context window?

Kimi K2.7 Code does, with 262K tokens against 128K.

### How many benchmarks do GPT-5.3 Chat and Kimi K2.7 Code share?

0 benchmarks have published results for both models. GPT-5.3 Chat has 18 scored results on Noometry and Kimi K2.7 Code has 19.