# DeepSeek-V3.1 vs GPT-5 Mini

> DeepSeek-V3.1 and GPT-5 Mini score almost the same on the Noometry Index (42.2 vs 41.7), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/deepseek-v3-1-vs-gpt-5-mini
- Last updated: 2026-10-10
- Shared benchmarks: 26

## Summary

- They share 26 benchmarks with published results for both. DeepSeek-V3.1 scores higher in 3 categories and GPT-5 Mini in 5 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5 Mini leads 46.3 to 36.1.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 53.2% for DeepSeek-V3.1 and 70.3% for GPT-5 Mini.
- DeepSeek-V3.1 is cheaper at $0.25 / $0.95 per million input/output tokens, against $0.25 / $2 for GPT-5 Mini.
- GPT-5 Mini accepts more context: 400K tokens versus 164K.
- DeepSeek-V3.1 has downloadable open weights; the other is API-only.

## Snapshot

| | DeepSeek-V3.1 | GPT-5 Mini |
|---|---|---|
| Provider | DeepSeek | OpenAI |
| Noometry Index | 42.2 | 41.7 |
| Rank | 106 | 115 |
| Context | 164K | 400K |
| Input $/M | $0.25 | $0.25 |
| Output $/M | $0.95 | $2 |
| Weights | Open | Proprietary |

## Coding

- DeepSeek-V3.1: 39.8 (#140)
- GPT-5 Mini: 40.0 (#134)

| Benchmark | DeepSeek-V3.1 | GPT-5 Mini |
|---|---|---|
| WeirdML | 38.4% | 52.7% |
| LMArena Coding | 1417 | 1406 |
| SWE-bench Verified | — | 64.7% |
| SWE-bench Verified (bash only) | — | 59.8% |
| SWE-bench Multilingual | — | 39.7% |
| SciCode | — | 39.2% |
| ALE-Bench | — | 799.77 |
| AlgoTune | — | 1.38 |

## Agentic & Tool Use

- DeepSeek-V3.1: —
- GPT-5 Mini: 31.0 (#64)

| Benchmark | DeepSeek-V3.1 | GPT-5 Mini |
|---|---|---|
| Terminal-Bench | — | 34.8% |
| Berkeley Function Calling Leaderboard | — | 55.5% |
| Vending-Bench 2 | — | -31.18 |

## Reasoning

- DeepSeek-V3.1: 27.3 (#109)
- GPT-5 Mini: 24.1 (#153)

| Benchmark | DeepSeek-V3.1 | GPT-5 Mini |
|---|---|---|
| Kagi LLM Benchmark | 53.2% | 70.3% |
| LMArena Hard Prompts | 1417 | 1380 |
| DTBench | 82.7% | 80.5% |
| LMCA | 24.3% | 34.2% |
| Epoch Capabilities Index | 139.92 | 145.51 |
| ForecastBench | 58 | 61 |
| ARC-AGI-2 | — | 4.4% |
| SimpleBench | 40% | — |
| ARC-AGI-1 | — | 54.3% |
| CritPt | — | 0% |
| Chess Puzzles | — | 30% |
| EnigmaEval | — | 8.2% |
| Mystery Game Puzzles | — | 10% |

## Math

- DeepSeek-V3.1: 36.1 (#125)
- GPT-5 Mini: 46.3 (#59)

| Benchmark | DeepSeek-V3.1 | GPT-5 Mini |
|---|---|---|
| LMArena Math | 1420 | 1377 |
| FrontierMath (Tiers 1-3) | — | 46.7% |
| FrontierMath Tier 4 | — | 12.2% |
| OTIS Mock AIME 2024-2025 | — | 86.7% |
| ProofBench | — | 9% |
| Omni-MATH | — | 72.2% |
| MATH Level 5 | — | 97.8% |
| FrontierMath (Feb 2025 set) | — | 27.2% |
| FrontierMath Tier 4 (v1) | — | 6.3% |

## Knowledge

- DeepSeek-V3.1: 43.0 (#86)
- GPT-5 Mini: 45.5 (#80)

| Benchmark | DeepSeek-V3.1 | GPT-5 Mini |
|---|---|---|
| Vectara Hallucination Rate | 5.5% | 12.9% |
| LMArena Expert | 1403 | 1377 |
| GPQA Diamond | — | 75% |
| Humanity's Last Exam | — | 19.4% |
| SimpleQA Verified | — | 21.6% |
| MMLU-Pro | — | 83.5% |
| Confabulations | — | 13.3% |
| GPQA (HELM) | — | 75.6% |

## Multimodal

- DeepSeek-V3.1: —
- GPT-5 Mini: 35.0 (#80)

| Benchmark | DeepSeek-V3.1 | GPT-5 Mini |
|---|---|---|
| LMArena Vision | — | 1202 |
| VPCT | — | 40.2% |

## Multilingual

- DeepSeek-V3.1: 51.8 (#100)
- GPT-5 Mini: 49.1 (#131)

| Benchmark | DeepSeek-V3.1 | GPT-5 Mini |
|---|---|---|
| LMArena Non-English | 1400 | 1363 |
| LMArena Chinese | 1470 | 1387 |
| LMArena French | 1447 | 1385 |
| LMArena German | 1412 | 1366 |
| LMArena Japanese | 1374 | 1342 |
| LMArena Korean | 1337 | 1306 |
| LMArena Russian | 1405 | 1362 |
| LMArena Spanish | 1429 | 1355 |

## Instruction Following

- DeepSeek-V3.1: 74.1 (#105)
- GPT-5 Mini: 76.4 (#43)

| Benchmark | DeepSeek-V3.1 | GPT-5 Mini |
|---|---|---|
| LMArena Instruction Following | 1400 | 1357 |
| IFEval | — | 92.7% |

## Long Context

- DeepSeek-V3.1: 36.3 (#227)
- GPT-5 Mini: 41.9 (#127)

| Benchmark | DeepSeek-V3.1 | GPT-5 Mini |
|---|---|---|
| Fiction.LiveBench | 52.8% | 69.4% |
| LMArena Longer Query | 1422 | 1355 |

## Writing & Preference

- DeepSeek-V3.1: 60.5 (#93)
- GPT-5 Mini: 55.4 (#143)

| Benchmark | DeepSeek-V3.1 | GPT-5 Mini |
|---|---|---|
| LMArena Text | 1420 | 1373 |
| LMArena Creative Writing | 1401 | 1325 |
| EQ-Bench Creative Writing | 1436 | 1313 |
| LMArena Multi-Turn | 1408 | 1363 |
| Short-Story Creative Writing | — | 83.1% |
| WildBench | — | 85.5% |

## FAQ

### Is DeepSeek-V3.1 better than GPT-5 Mini?

DeepSeek-V3.1 and GPT-5 Mini score almost the same on the Noometry Index (42.2 vs 41.7), so choose on price, context window or the category you care about most.

### Which is cheaper, DeepSeek-V3.1 or GPT-5 Mini?

DeepSeek-V3.1 is cheaper. It lists at $0.25 per million input tokens and $0.95 per million output tokens; GPT-5 Mini lists at $0.25 and $2.

### Is DeepSeek-V3.1 or GPT-5 Mini better for coding?

They score almost the same on coding (39.8 vs 40.0); test both on your own repository before choosing.

### Which has the bigger context window?

GPT-5 Mini does, with 400K tokens against 164K.

### How many benchmarks do DeepSeek-V3.1 and GPT-5 Mini share?

26 benchmarks have published results for both models. DeepSeek-V3.1 has 27 scored results on Noometry and GPT-5 Mini has 60.