# DeepSeek-V2.5 (Sep 2024) vs GPT-5.3 Chat

> GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 37.6 on the Noometry Index.

- Canonical page: https://noometry.com/compare/deepseek-v2-5-vs-gpt-5-3-chat
- Last updated: 2026-10-10
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. DeepSeek-V2.5 (Sep 2024) scores higher in 0 categories and GPT-5.3 Chat in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where GPT-5.3 Chat leads 63.1 to 49.8.
- DeepSeek-V2.5 (Sep 2024) has downloadable open weights; the other is API-only.

## Snapshot

| | DeepSeek-V2.5 (Sep 2024) | GPT-5.3 Chat |
|---|---|---|
| Provider | DeepSeek | OpenAI |
| Noometry Index | 37.6 | 42.8 |
| Rank | 200 | 109 |
| Context | — | 128K |
| Input $/M | — | $1.75 |
| Output $/M | — | $14 |
| Weights | Open | Proprietary |

## Coding

- DeepSeek-V2.5 (Sep 2024): 31.7 (#281)
- GPT-5.3 Chat: 41.4 (#124)

| Benchmark | DeepSeek-V2.5 (Sep 2024) | GPT-5.3 Chat |
|---|---|---|
| LMArena Coding | 1309 | 1408 |
| Aider Polyglot | 17.8% | — |
| BigCodeBench Instruct | 48.6% | — |
| BigCodeBench Complete | 53.2% | — |
| HumanEval+ | 83.5% | — |
| MBPP+ | 74.1% | — |

## Reasoning

- DeepSeek-V2.5 (Sep 2024): 25.6 (#145)
- GPT-5.3 Chat: 28.5 (#102)

| Benchmark | DeepSeek-V2.5 (Sep 2024) | GPT-5.3 Chat |
|---|---|---|
| LMArena Hard Prompts | 1289 | 1399 |

## Math

- DeepSeek-V2.5 (Sep 2024): 35.9 (#177)
- GPT-5.3 Chat: 38.2 (#142)

| Benchmark | DeepSeek-V2.5 (Sep 2024) | GPT-5.3 Chat |
|---|---|---|
| LMArena Math | 1288 | 1389 |

## Knowledge

- DeepSeek-V2.5 (Sep 2024): 34.8 (#193)
- GPT-5.3 Chat: 38.8 (#140)

| Benchmark | DeepSeek-V2.5 (Sep 2024) | GPT-5.3 Chat |
|---|---|---|
| LMArena Expert | 1266 | 1397 |

## Multilingual

- DeepSeek-V2.5 (Sep 2024): 42.5 (#193)
- GPT-5.3 Chat: 50.3 (#124)

| Benchmark | DeepSeek-V2.5 (Sep 2024) | GPT-5.3 Chat |
|---|---|---|
| LMArena Non-English | 1273 | 1382 |
| LMArena Chinese | 1318 | 1432 |
| LMArena French | 1289 | 1397 |
| LMArena German | 1258 | 1384 |
| LMArena Japanese | 1228 | 1352 |
| LMArena Korean | 1209 | 1346 |
| LMArena Russian | 1289 | 1400 |
| LMArena Spanish | 1248 | 1371 |

## Instruction Following

- DeepSeek-V2.5 (Sep 2024): 67.5 (#194)
- GPT-5.3 Chat: 72.8 (#129)

| Benchmark | DeepSeek-V2.5 (Sep 2024) | GPT-5.3 Chat |
|---|---|---|
| LMArena Instruction Following | 1280 | 1378 |

## Long Context

- DeepSeek-V2.5 (Sep 2024): 39.5 (#174)
- GPT-5.3 Chat: 42.6 (#120)

| Benchmark | DeepSeek-V2.5 (Sep 2024) | GPT-5.3 Chat |
|---|---|---|
| LMArena Longer Query | 1301 | 1396 |

## Writing & Preference

- DeepSeek-V2.5 (Sep 2024): 49.8 (#187)
- GPT-5.3 Chat: 63.1 (#68)

| Benchmark | DeepSeek-V2.5 (Sep 2024) | GPT-5.3 Chat |
|---|---|---|
| LMArena Text | 1294 | 1389 |
| LMArena Creative Writing | 1285 | 1355 |
| LMArena Multi-Turn | 1297 | 1412 |
| EQ-Bench Creative Writing | — | 1690 |

## FAQ

### Is DeepSeek-V2.5 (Sep 2024) better than GPT-5.3 Chat?

GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 37.6 on the Noometry Index.

### Is DeepSeek-V2.5 (Sep 2024) or GPT-5.3 Chat better for coding?

GPT-5.3 Chat scores higher on coding benchmarks: 41.4 versus 31.7 in the Noometry coding category.

### How many benchmarks do DeepSeek-V2.5 (Sep 2024) and GPT-5.3 Chat share?

17 benchmarks have published results for both models. DeepSeek-V2.5 (Sep 2024) has 22 scored results on Noometry and GPT-5.3 Chat has 18.