# GPT-6 Luna vs Longcat Flash Chat

> GPT-6 Luna is the stronger model overall, scoring 53.3 to 42.1 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-6-luna-vs-longcat-flash-chat
- Last updated: 2026-10-10
- Shared benchmarks: 18

## Summary

- They share 18 benchmarks with published results for both. GPT-6 Luna scores higher in 4 categories and Longcat Flash Chat in 4 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-6 Luna leads 76.1 to 39.4.
- The biggest single-benchmark swing is NYT Connections (extended): 68.7% for GPT-6 Luna and 17.7% for Longcat Flash Chat.
- Longcat Flash Chat has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-6 Luna | Longcat Flash Chat |
|---|---|---|
| Provider | OpenAI | Meituan |
| Noometry Index | 53.3 | 42.1 |
| Rank | 36 | 120 |
| Context | 1.05M | — |
| Input $/M | $0.10 | — |
| Output $/M | $0.50 | — |
| Weights | Proprietary | Open |

## Coding

- GPT-6 Luna: 55.5 (#25)
- Longcat Flash Chat: 43.5 (#87)

| Benchmark | GPT-6 Luna | Longcat Flash Chat |
|---|---|---|
| LMArena Coding | 1439 | 1471 |
| DeepSWE | 66.6% | — |
| FrontierCode | 42.4% | — |
| LMArena WebDev | 1581 | — |
| SciCode | 54.6% | — |
| ALE-Bench | 1,577 | — |

## Agentic & Tool Use

- GPT-6 Luna: 33.3 (#54)
- Longcat Flash Chat: —

| Benchmark | GPT-6 Luna | Longcat Flash Chat |
|---|---|---|
| APEX-Agents | 44.3% | — |
| GDP.pdf | 23% | — |

## Reasoning

- GPT-6 Luna: 48.2 (#41)
- Longcat Flash Chat: 19.0 (#272)

| Benchmark | GPT-6 Luna | Longcat Flash Chat |
|---|---|---|
| NYT Connections (extended) | 68.7% | 17.7% |
| LMArena Hard Prompts | 1411 | 1440 |
| ARC-AGI-2 | 59.3% | — |
| Kagi LLM Benchmark | — | 43.9% |
| ARC-AGI-1 | 86.7% | — |
| CritPt | 19.4% | — |
| Chess Puzzles | 31% | — |
| Mystery Game Puzzles | 7% | — |
| DTBench | 90.1% | — |
| LMCA | 44.5% | — |
| Epoch Capabilities Index | 156.28 | — |

## Math

- GPT-6 Luna: 76.1 (#15)
- Longcat Flash Chat: 39.4 (#107)

| Benchmark | GPT-6 Luna | Longcat Flash Chat |
|---|---|---|
| LMArena Math | 1416 | 1442 |
| FrontierMath (Tiers 1-3) | 78.9% | — |
| FrontierMath Tier 4 | 56.1% | — |
| OTIS Mock AIME 2024-2025 | 98.9% | — |
| ProofBench | 64% | — |

## Knowledge

- GPT-6 Luna: 57.0 (#41)
- Longcat Flash Chat: 40.6 (#116)

| Benchmark | GPT-6 Luna | Longcat Flash Chat |
|---|---|---|
| LMArena Expert | 1444 | 1454 |
| GPQA Diamond | 90.5% | — |
| SimpleQA Verified | 41.4% | — |

## Multimodal

- GPT-6 Luna: 42.4 (#30)
- Longcat Flash Chat: —

| Benchmark | GPT-6 Luna | Longcat Flash Chat |
|---|---|---|
| LMArena Vision | 1217 | — |
| Blueprint-Bench 2 | 31.2% | — |
| Furniture Assembly | 44.2% | — |

## Multilingual

- GPT-6 Luna: 50.5 (#117)
- Longcat Flash Chat: 51.9 (#101)

| Benchmark | GPT-6 Luna | Longcat Flash Chat |
|---|---|---|
| LMArena Non-English | 1386 | 1404 |
| LMArena Chinese | 1433 | 1465 |
| LMArena French | 1420 | 1456 |
| LMArena German | 1369 | 1408 |
| LMArena Japanese | 1369 | 1373 |
| LMArena Korean | 1360 | 1371 |
| LMArena Russian | 1394 | 1395 |
| LMArena Spanish | 1393 | 1445 |

## Instruction Following

- GPT-6 Luna: 74.3 (#99)
- Longcat Flash Chat: 74.4 (#96)

| Benchmark | GPT-6 Luna | Longcat Flash Chat |
|---|---|---|
| LMArena Instruction Following | 1409 | 1411 |

## Long Context

- GPT-6 Luna: 43.0 (#111)
- Longcat Flash Chat: 43.5 (#93)

| Benchmark | GPT-6 Luna | Longcat Flash Chat |
|---|---|---|
| LMArena Longer Query | 1409 | 1425 |

## Writing & Preference

- GPT-6 Luna: 58.3 (#119)
- Longcat Flash Chat: 61.0 (#91)

| Benchmark | GPT-6 Luna | Longcat Flash Chat |
|---|---|---|
| LMArena Text | 1391 | 1427 |
| LMArena Creative Writing | 1363 | 1388 |
| LMArena Multi-Turn | 1396 | 1418 |

## FAQ

### Is GPT-6 Luna better than Longcat Flash Chat?

GPT-6 Luna is the stronger model overall, scoring 53.3 to 42.1 on the Noometry Index.

### Is GPT-6 Luna or Longcat Flash Chat better for coding?

GPT-6 Luna scores higher on coding benchmarks: 55.5 versus 43.5 in the Noometry coding category.

### How many benchmarks do GPT-6 Luna and Longcat Flash Chat share?

18 benchmarks have published results for both models. GPT-6 Luna has 42 scored results on Noometry and Longcat Flash Chat has 19.