# DeepSeek-V2.5 (Sep 2024) vs GPT-5.5

> GPT-5.5 is the stronger model overall, scoring 63.4 to 37.6 on the Noometry Index.

- Canonical page: https://noometry.com/compare/deepseek-v2-5-vs-gpt-5-5
- 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-5.5 in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5.5 leads 72.8 to 25.6.
- DeepSeek-V2.5 (Sep 2024) has downloadable open weights; the other is API-only.

## Snapshot

| | DeepSeek-V2.5 (Sep 2024) | GPT-5.5 |
|---|---|---|
| Provider | DeepSeek | OpenAI |
| Noometry Index | 37.6 | 63.4 |
| Rank | 200 | 9 |
| Context | — | 1.05M |
| Input $/M | — | $5 |
| Output $/M | — | $30 |
| Weights | Open | Proprietary |

## Coding

- DeepSeek-V2.5 (Sep 2024): 31.7 (#281)
- GPT-5.5: 58.2 (#17)

| Benchmark | DeepSeek-V2.5 (Sep 2024) | GPT-5.5 |
|---|---|---|
| LMArena Coding | 1309 | 1494 |
| SWE-bench Verified | — | 80.6% |
| DeepSWE | — | 67% |
| FrontierCode | — | 43% |
| Aider Polyglot | 17.8% | — |
| LMArena WebDev | — | 1513 |
| SciCode | — | 56.1% |
| GSO | — | 40.2% |
| WeirdML | — | 84.9% |
| BigCodeBench Instruct | 48.6% | — |
| MirrorCode | — | 10% |
| BigCodeBench Complete | 53.2% | — |
| ALE-Bench | — | 1,943 |
| HumanEval+ | 83.5% | — |
| MBPP+ | 74.1% | — |

## Agentic & Tool Use

- DeepSeek-V2.5 (Sep 2024): —
- GPT-5.5: 50.7 (#6)

| Benchmark | DeepSeek-V2.5 (Sep 2024) | GPT-5.5 |
|---|---|---|
| Terminal-Bench | — | 84.7% |
| APEX-Agents | — | 55.1% |
| OSWorld 2.0 | — | 13% |
| Remote Labor Index | — | 6.3% |
| τ²-bench Banking | — | 44.6% |
| DeepResearch Bench | — | 54% |
| PostTrainBench | — | 27.2% |
| ExploitBench | — | 47.4% |
| GBAEval | — | 53.2% |
| GDP.pdf | — | 26% |
| LMArena Search | — | 1242 |
| Vending-Bench 2 | — | 7,524 |

## Reasoning

- DeepSeek-V2.5 (Sep 2024): 25.6 (#145)
- GPT-5.5: 72.8 (#11)

| Benchmark | DeepSeek-V2.5 (Sep 2024) | GPT-5.5 |
|---|---|---|
| LMArena Hard Prompts | 1289 | 1489 |
| ARC-AGI-2 | — | 85% |
| SimpleBench | — | 69% |
| Kagi LLM Benchmark | — | 88.8% |
| NYT Connections (extended) | — | 96.2% |
| ARC-AGI-1 | — | 95% |
| CritPt | — | 27.1% |
| Chess Puzzles | — | 54% |
| EBR-Bench | — | 34.3% |
| Mystery Game Puzzles | — | 56% |
| DTBench | — | 96% |
| LMCA | — | 54.3% |
| Surface Evolver Bench | — | 88.1% |
| Bench to the Future 3 | — | 0.14 |
| Epoch Capabilities Index | — | 159.1 |
| ForecastBench | — | 60.6 |

## Math

- DeepSeek-V2.5 (Sep 2024): 35.9 (#177)
- GPT-5.5: 81.7 (#11)

| Benchmark | DeepSeek-V2.5 (Sep 2024) | GPT-5.5 |
|---|---|---|
| LMArena Math | 1288 | 1486 |
| FrontierMath (Tiers 1-3) | — | 85.3% |
| FrontierMath Tier 4 | — | 72.5% |
| MathArena Final-Answer Competitions | — | 94.3% |
| OTIS Mock AIME 2024-2025 | — | 100% |
| ProofBench | — | 50% |
| FrontierMath (Feb 2025 set) | — | 51.7% |
| FrontierMath Erdős | — | 0% |
| FrontierMath Tier 4 (v1) | — | 35.4% |

## Knowledge

- DeepSeek-V2.5 (Sep 2024): 34.8 (#193)
- GPT-5.5: 64.4 (#17)

| Benchmark | DeepSeek-V2.5 (Sep 2024) | GPT-5.5 |
|---|---|---|
| LMArena Expert | 1266 | 1508 |
| GPQA Diamond | — | 94% |
| SimpleQA Verified | — | 63% |
| Vectara Hallucination Rate | — | 9.3% |

## Multimodal

- DeepSeek-V2.5 (Sep 2024): —
- GPT-5.5: 46.9 (#12)

| Benchmark | DeepSeek-V2.5 (Sep 2024) | GPT-5.5 |
|---|---|---|
| LMArena Vision | — | 1297 |
| Blueprint-Bench 2 | — | 36.2% |
| Furniture Assembly | — | 44.2% |
| LMArena Document | — | 1486 |

## Multilingual

- DeepSeek-V2.5 (Sep 2024): 42.5 (#193)
- GPT-5.5: 56.4 (#20)

| Benchmark | DeepSeek-V2.5 (Sep 2024) | GPT-5.5 |
|---|---|---|
| LMArena Non-English | 1273 | 1467 |
| LMArena Chinese | 1318 | 1533 |
| LMArena French | 1289 | 1486 |
| LMArena German | 1258 | 1480 |
| LMArena Japanese | 1228 | 1498 |
| LMArena Korean | 1209 | 1460 |
| LMArena Russian | 1289 | 1473 |
| LMArena Spanish | 1248 | 1468 |

## Instruction Following

- DeepSeek-V2.5 (Sep 2024): 67.5 (#194)
- GPT-5.5: 77.5 (#18)

| Benchmark | DeepSeek-V2.5 (Sep 2024) | GPT-5.5 |
|---|---|---|
| LMArena Instruction Following | 1280 | 1479 |

## Long Context

- DeepSeek-V2.5 (Sep 2024): 39.5 (#174)
- GPT-5.5: 48.3 (#12)

| Benchmark | DeepSeek-V2.5 (Sep 2024) | GPT-5.5 |
|---|---|---|
| LMArena Longer Query | 1301 | 1484 |
| CL-bench Life | — | 22.2% |

## Writing & Preference

- DeepSeek-V2.5 (Sep 2024): 49.8 (#187)
- GPT-5.5: 72.7 (#13)

| Benchmark | DeepSeek-V2.5 (Sep 2024) | GPT-5.5 |
|---|---|---|
| LMArena Text | 1294 | 1472 |
| LMArena Creative Writing | 1285 | 1455 |
| LMArena Multi-Turn | 1297 | 1476 |
| EQ-Bench Creative Writing | — | 1844 |
| EQ-Bench 4 | — | 1315 |

## FAQ

### Is DeepSeek-V2.5 (Sep 2024) better than GPT-5.5?

GPT-5.5 is the stronger model overall, scoring 63.4 to 37.6 on the Noometry Index.

### Is DeepSeek-V2.5 (Sep 2024) or GPT-5.5 better for coding?

GPT-5.5 scores higher on coding benchmarks: 58.2 versus 31.7 in the Noometry coding category.

### How many benchmarks do DeepSeek-V2.5 (Sep 2024) and GPT-5.5 share?

17 benchmarks have published results for both models. DeepSeek-V2.5 (Sep 2024) has 22 scored results on Noometry and GPT-5.5 has 71.