# GPT-5.4 Pro vs Kimi K2.5 Instant

> GPT-5.4 Pro is the stronger model overall, scoring 58.9 to 43.6 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-4-pro-vs-kimi-k2-5-instant
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in reasoning, where GPT-5.4 Pro leads 70.7 to 29.7.
- Kimi K2.5 Instant has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.4 Pro | Kimi K2.5 Instant |
|---|---|---|
| Provider | OpenAI | Moonshot AI |
| Noometry Index | 58.9 | 43.6 |
| Rank | 18 | 89 |
| Context | 1.05M | — |
| Input $/M | $30 | — |
| Output $/M | $180 | — |
| Weights | Proprietary | Open |

## Coding

- GPT-5.4 Pro: 43.2 (#90)
- Kimi K2.5 Instant: 42.6 (#97)

| Benchmark | GPT-5.4 Pro | Kimi K2.5 Instant |
|---|---|---|
| LMArena WebDev | — | 1404 |
| WeirdML | 57.4% | — |
| LMArena Coding | — | 1484 |

## Reasoning

- GPT-5.4 Pro: 70.7 (#13)
- Kimi K2.5 Instant: 29.7 (#90)

| Benchmark | GPT-5.4 Pro | Kimi K2.5 Instant |
|---|---|---|
| ARC-AGI-2 | 83.3% | — |
| SimpleBench | 74.1% | — |
| ARC-AGI-1 | 94.5% | — |
| CritPt | 30% | — |
| Chess Puzzles | 58.6% | — |
| EnigmaEval | 23.8% | — |
| LMArena Hard Prompts | — | 1443 |
| Epoch Capabilities Index | 158.93 | — |

## Math

- GPT-5.4 Pro: 72.4 (#22)
- Kimi K2.5 Instant: 39.4 (#105)

| Benchmark | GPT-5.4 Pro | Kimi K2.5 Instant |
|---|---|---|
| FrontierMath (Tiers 1-3) | 82.5% | — |
| FrontierMath Tier 4 | 58.5% | — |
| LMArena Math | — | 1442 |
| FrontierMath (Feb 2025 set) | 50% | — |
| FrontierMath Tier 4 (v1) | 37.5% | — |

## Knowledge

- GPT-5.4 Pro: 68.3 (#7)
- Kimi K2.5 Instant: 40.2 (#123)

| Benchmark | GPT-5.4 Pro | Kimi K2.5 Instant |
|---|---|---|
| GPQA Diamond | 94.6% | — |
| Humanity's Last Exam | 44.3% | — |
| SimpleQA Verified | 46.3% | — |
| Vectara Hallucination Rate | 8.3% | — |
| LMArena Expert | — | 1440 |

## Multimodal

- GPT-5.4 Pro: —
- Kimi K2.5 Instant: 40.2 (#50)

| Benchmark | GPT-5.4 Pro | Kimi K2.5 Instant |
|---|---|---|
| LMArena Vision | — | 1254 |

## Multilingual

- GPT-5.4 Pro: —
- Kimi K2.5 Instant: 52.0 (#94)

| Benchmark | GPT-5.4 Pro | Kimi K2.5 Instant |
|---|---|---|
| LMArena Non-English | — | 1406 |
| LMArena Chinese | — | 1449 |
| LMArena French | — | 1403 |
| LMArena German | — | 1413 |
| LMArena Korean | — | 1378 |
| LMArena Russian | — | 1404 |
| LMArena Spanish | — | 1447 |

## Instruction Following

- GPT-5.4 Pro: —
- Kimi K2.5 Instant: 75.3 (#65)

| Benchmark | GPT-5.4 Pro | Kimi K2.5 Instant |
|---|---|---|
| LMArena Instruction Following | — | 1430 |

## Long Context

- GPT-5.4 Pro: —
- Kimi K2.5 Instant: 43.9 (#83)

| Benchmark | GPT-5.4 Pro | Kimi K2.5 Instant |
|---|---|---|
| LMArena Longer Query | — | 1435 |

## Writing & Preference

- GPT-5.4 Pro: —
- Kimi K2.5 Instant: 60.6 (#95)

| Benchmark | GPT-5.4 Pro | Kimi K2.5 Instant |
|---|---|---|
| LMArena Text | — | 1420 |
| LMArena Creative Writing | — | 1381 |
| LMArena Multi-Turn | — | 1427 |

## FAQ

### Is GPT-5.4 Pro better than Kimi K2.5 Instant?

GPT-5.4 Pro is the stronger model overall, scoring 58.9 to 43.6 on the Noometry Index.

### Is GPT-5.4 Pro or Kimi K2.5 Instant better for coding?

They score almost the same on coding (43.2 vs 42.6); test both on your own repository before choosing.

### How many benchmarks do GPT-5.4 Pro and Kimi K2.5 Instant share?

0 benchmarks have published results for both models. GPT-5.4 Pro has 16 scored results on Noometry and Kimi K2.5 Instant has 18.