# GPT-5.4 vs Kimi K3

> GPT-5.4 and Kimi K3 score almost the same on the Noometry Index (59.4 vs 59.5), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/gpt-5-4-vs-kimi-k3
- Last updated: 2026-10-11
- Shared benchmarks: 48

## Summary

- They share 48 benchmarks with published results for both. GPT-5.4 scores higher in 4 categories and Kimi K3 in 6 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in coding, where Kimi K3 leads 61.0 to 52.6.
- The biggest single-benchmark swing is ProofBench: 56% for GPT-5.4 and 87% for Kimi K3.
- GPT-5.4 is cheaper at $2.50 / $15 per million input/output tokens, against $3 / $15 for Kimi K3.
- GPT-5.4 accepts more context: 1.05M tokens versus 1.05M.
- Kimi K3 has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.4 | Kimi K3 |
|---|---|---|
| Provider | OpenAI | Moonshot AI |
| Noometry Index | 59.4 | 59.5 |
| Rank | 16 | 15 |
| Context | 1.05M | 1.05M |
| Input $/M | $2.50 | $3 |
| Output $/M | $15 | $15 |
| Weights | Proprietary | Open |

## Coding

- GPT-5.4: 52.6 (#33)
- Kimi K3: 61.0 (#10)

| Benchmark | GPT-5.4 | Kimi K3 |
|---|---|---|
| DeepSWE | 51.8% | 68.5% |
| LMArena WebDev | 1465 | 1654 |
| SciCode | 56.6% | 59.5% |
| WeirdML | 77.7% | 82.6% |
| LMArena Coding | 1497 | 1508 |
| ALE-Bench | 1,607 | 1,524 |
| SWE-bench Verified | 76.9% | — |
| FrontierCode | — | 44.2% |
| FrontierSWE | — | 25.9% |
| GSO | 31.4% | — |
| MirrorCode | 15.6% | — |
| AlgoTune | 1.85 | — |

## Agentic & Tool Use

- GPT-5.4: 46.5 (#13)
- Kimi K3: 41.8 (#20)

| Benchmark | GPT-5.4 | Kimi K3 |
|---|---|---|
| APEX-Agents | 52.4% | 50.6% |
| τ²-bench Banking | 39.4% | 37.1% |
| PostTrainBench | 19% | 32% |
| GBAEval | 45.1% | 48.3% |
| Vending-Bench 2 | 6,144 | 5,165 |
| Terminal-Bench | 81.8% | — |
| DeepResearch Bench | 35.1% | — |
| GDP.pdf | — | 19% |
| LMArena Search | 1197 | — |
| METR Time Horizons | 74.3% | — |

## Reasoning

- GPT-5.4: 61.8 (#19)
- Kimi K3: 63.0 (#17)

| Benchmark | GPT-5.4 | Kimi K3 |
|---|---|---|
| ARC-AGI-2 | 74% | 60.4% |
| NYT Connections (extended) | 91.3% | 93.6% |
| ARC-AGI-1 | 93.7% | 94.5% |
| CritPt | 23.4% | 23.4% |
| Chess Puzzles | 44% | 39% |
| LMArena Hard Prompts | 1485 | 1496 |
| Mystery Game Puzzles | 37% | 26% |
| DTBench | 94.4% | 91.2% |
| LMCA | 52% | 52.7% |
| Epoch Capabilities Index | 156.81 | 157.45 |
| ForecastBench | 59.5 | 61.1 |
| SimpleBench | — | 60.7% |
| Kagi LLM Benchmark | 63.8% | — |
| EnigmaEval | 16% | — |
| Thematic Generalization | 80% | — |
| EBR-Bench | 25.4% | — |
| Surface Evolver Bench | — | 95% |

## Math

- GPT-5.4: 73.5 (#19)
- Kimi K3: 74.2 (#16)

| Benchmark | GPT-5.4 | Kimi K3 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 78.6% | 72.2% |
| FrontierMath Tier 4 | 49% | 39% |
| MathArena Final-Answer Competitions | 83.1% | 87.8% |
| OTIS Mock AIME 2024-2025 | 97.8% | 97.2% |
| ProofBench | 56% | 87% |
| LMArena Math | 1488 | 1491 |
| FrontierMath (Feb 2025 set) | 47.6% | — |
| FrontierMath Tier 4 (v1) | 27.1% | — |

## Knowledge

- GPT-5.4: 65.3 (#14)
- Kimi K3: 63.2 (#21)

| Benchmark | GPT-5.4 | Kimi K3 |
|---|---|---|
| GPQA Diamond | 93.3% | 93.1% |
| SimpleQA Verified | 45.1% | 50.6% |
| LMArena Expert | 1507 | 1521 |
| Humanity's Last Exam | 36.2% | — |
| Vectara Hallucination Rate | 7% | — |

## Multimodal

- GPT-5.4: 43.7 (#20)
- Kimi K3: 37.8 (#70)

| Benchmark | GPT-5.4 | Kimi K3 |
|---|---|---|
| Blueprint-Bench 2 | 27.1% | 29.5% |
| Furniture Assembly | 37.5% | 34.2% |
| LMArena Vision | 1303 | — |
| LMArena Document | 1471 | — |

## Multilingual

- GPT-5.4: 56.2 (#23)
- Kimi K3: 56.3 (#21)

| Benchmark | GPT-5.4 | Kimi K3 |
|---|---|---|
| LMArena Non-English | 1465 | 1466 |
| LMArena Chinese | 1519 | 1529 |
| LMArena French | 1493 | 1491 |
| LMArena German | 1472 | 1488 |
| LMArena Japanese | 1485 | 1487 |
| LMArena Korean | 1448 | 1458 |
| LMArena Russian | 1480 | 1482 |
| LMArena Spanish | 1454 | 1472 |

## Instruction Following

- GPT-5.4: 77.1 (#27)
- Kimi K3: 77.7 (#14)

| Benchmark | GPT-5.4 | Kimi K3 |
|---|---|---|
| LMArena Instruction Following | 1469 | 1483 |

## Long Context

- GPT-5.4: 50.3 (#8)
- Kimi K3: 45.8 (#29)

| Benchmark | GPT-5.4 | Kimi K3 |
|---|---|---|
| LMArena Longer Query | 1473 | 1494 |
| CL-bench | 27.9% | — |
| CL-bench Life | 21.7% | — |

## Writing & Preference

- GPT-5.4: 71.9 (#17)
- Kimi K3: 76.6 (#4)

| Benchmark | GPT-5.4 | Kimi K3 |
|---|---|---|
| LMArena Text | 1469 | 1476 |
| LMArena Creative Writing | 1439 | 1454 |
| EQ-Bench Creative Writing | 1840 | 2082 |
| EQ-Bench 4 | 1272 | 1339 |
| LMArena Multi-Turn | 1482 | 1488 |

## FAQ

### Is GPT-5.4 better than Kimi K3?

GPT-5.4 and Kimi K3 score almost the same on the Noometry Index (59.4 vs 59.5), so choose on price, context window or the category you care about most.

### Which is cheaper, GPT-5.4 or Kimi K3?

GPT-5.4 is cheaper. It lists at $2.50 per million input tokens and $15 per million output tokens; Kimi K3 lists at $3 and $15.

### Is GPT-5.4 or Kimi K3 better for coding?

Kimi K3 scores higher on coding benchmarks: 61.0 versus 52.6 in the Noometry coding category.

### Which has the bigger context window?

GPT-5.4 does, with 1.05M tokens against 1.05M.

### How many benchmarks do GPT-5.4 and Kimi K3 share?

48 benchmarks have published results for both models. GPT-5.4 has 68 scored results on Noometry and Kimi K3 has 53.