# Chatgpt 4o Latest 20250326 vs DeepSeek V4.1 Flash

> DeepSeek V4.1 Flash is the stronger model overall, scoring 52.8 to 43.8 on the Noometry Index.

- Canonical page: https://noometry.com/compare/chatgpt-4o-vs-deepseek-v4-1-flash
- Last updated: 2026-10-12
- Shared benchmarks: 19

## Summary

- They share 19 benchmarks with published results for both. Chatgpt 4o Latest 20250326 scores higher in 1 category and DeepSeek V4.1 Flash in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where DeepSeek V4.1 Flash leads 66.7 to 38.6.
- DeepSeek V4.1 Flash has downloadable open weights; the other is API-only.

## Snapshot

| | Chatgpt 4o Latest 20250326 | DeepSeek V4.1 Flash |
|---|---|---|
| Provider | OpenAI | DeepSeek |
| Noometry Index | 43.8 | 52.8 |
| Rank | 82 | 38 |
| Context | — | 1M |
| Input $/M | — | $0.15 |
| Output $/M | — | $0.60 |
| Weights | Proprietary | Open |

## Coding

- Chatgpt 4o Latest 20250326: 41.6 (#122)
- DeepSeek V4.1 Flash: 52.9 (#32)

| Benchmark | Chatgpt 4o Latest 20250326 | DeepSeek V4.1 Flash |
|---|---|---|
| LMArena Coding | 1413 | 1506 |
| LMArena WebDev | — | 1619 |
| SciCode | — | 51.9% |
| ALE-Bench | — | 1,092 |

## Agentic & Tool Use

- Chatgpt 4o Latest 20250326: —
- DeepSeek V4.1 Flash: 31.2 (#69)

| Benchmark | Chatgpt 4o Latest 20250326 | DeepSeek V4.1 Flash |
|---|---|---|
| APEX-Agents | — | 39.5% |
| GDP.pdf | — | 19.8% |

## Reasoning

- Chatgpt 4o Latest 20250326: 33.8 (#71)
- DeepSeek V4.1 Flash: 50.2 (#36)

| Benchmark | Chatgpt 4o Latest 20250326 | DeepSeek V4.1 Flash |
|---|---|---|
| LMArena Hard Prompts | 1424 | 1483 |
| Kagi LLM Benchmark | 75% | — |
| NYT Connections (extended) | — | 89.6% |
| CritPt | — | 14.3% |
| Mystery Game Puzzles | — | 43% |
| DTBench | — | 89.9% |
| LMCA | — | 47% |
| Surface Evolver Bench | — | 46.3% |
| Epoch Capabilities Index | — | 154.9 |

## Math

- Chatgpt 4o Latest 20250326: 38.6 (#134)
- DeepSeek V4.1 Flash: 66.7 (#25)

| Benchmark | Chatgpt 4o Latest 20250326 | DeepSeek V4.1 Flash |
|---|---|---|
| LMArena Math | 1407 | 1477 |
| FrontierMath (Tiers 1-3) | — | 67.4% |
| FrontierMath Tier 4 | — | 26.8% |
| OTIS Mock AIME 2024-2025 | — | 98.3% |
| ProofBench | — | 54% |

## Knowledge

- Chatgpt 4o Latest 20250326: 39.2 (#137)
- DeepSeek V4.1 Flash: 57.9 (#38)

| Benchmark | Chatgpt 4o Latest 20250326 | DeepSeek V4.1 Flash |
|---|---|---|
| LMArena Expert | 1401 | 1506 |
| GPQA Diamond | — | 89.8% |
| Confabulations | 16.6% | — |

## Multimodal

- Chatgpt 4o Latest 20250326: 39.6 (#58)
- DeepSeek V4.1 Flash: 39.1 (#61)

| Benchmark | Chatgpt 4o Latest 20250326 | DeepSeek V4.1 Flash |
|---|---|---|
| LMArena Vision | 1243 | 1277 |
| Furniture Assembly | — | 34.2% |

## Multilingual

- Chatgpt 4o Latest 20250326: 52.9 (#76)
- DeepSeek V4.1 Flash: 55.0 (#35)

| Benchmark | Chatgpt 4o Latest 20250326 | DeepSeek V4.1 Flash |
|---|---|---|
| LMArena Non-English | 1419 | 1448 |
| LMArena Chinese | 1457 | 1497 |
| LMArena French | 1446 | 1452 |
| LMArena German | 1423 | 1484 |
| LMArena Japanese | 1405 | 1412 |
| LMArena Korean | 1396 | 1452 |
| LMArena Russian | 1429 | 1471 |
| LMArena Spanish | 1434 | 1459 |

## Instruction Following

- Chatgpt 4o Latest 20250326: 74.0 (#107)
- DeepSeek V4.1 Flash: 77.3 (#26)

| Benchmark | Chatgpt 4o Latest 20250326 | DeepSeek V4.1 Flash |
|---|---|---|
| LMArena Instruction Following | 1403 | 1474 |

## Long Context

- Chatgpt 4o Latest 20250326: 43.1 (#107)
- DeepSeek V4.1 Flash: 45.2 (#47)

| Benchmark | Chatgpt 4o Latest 20250326 | DeepSeek V4.1 Flash |
|---|---|---|
| LMArena Longer Query | 1413 | 1475 |

## Writing & Preference

- Chatgpt 4o Latest 20250326: 62.6 (#72)
- DeepSeek V4.1 Flash: 65.4 (#48)

| Benchmark | Chatgpt 4o Latest 20250326 | DeepSeek V4.1 Flash |
|---|---|---|
| LMArena Text | 1429 | 1462 |
| LMArena Creative Writing | 1405 | 1435 |
| EQ-Bench Creative Writing | 1501 | 1540 |
| LMArena Multi-Turn | 1454 | 1457 |

## FAQ

### Is Chatgpt 4o Latest 20250326 better than DeepSeek V4.1 Flash?

DeepSeek V4.1 Flash is the stronger model overall, scoring 52.8 to 43.8 on the Noometry Index.

### Is Chatgpt 4o Latest 20250326 or DeepSeek V4.1 Flash better for coding?

DeepSeek V4.1 Flash scores higher on coding benchmarks: 52.9 versus 41.6 in the Noometry coding category.

### How many benchmarks do Chatgpt 4o Latest 20250326 and DeepSeek V4.1 Flash share?

19 benchmarks have published results for both models. Chatgpt 4o Latest 20250326 has 21 scored results on Noometry and DeepSeek V4.1 Flash has 37.