# DeepSeek V4.1 Flash vs Gemini 2.5 Deep Think

> DeepSeek V4.1 Flash has enough public results to be ranked (#40); Gemini 2.5 Deep Think does not yet, so treat this comparison as directional.

- Canonical page: https://noometry.com/compare/deepseek-v4-1-flash-vs-gemini-2-5-deep-think
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- DeepSeek V4.1 Flash has downloadable open weights; the other is API-only.

## Snapshot

| | DeepSeek V4.1 Flash | Gemini 2.5 Deep Think |
|---|---|---|
| Provider | DeepSeek | Google |
| Noometry Index | 50.3 | — |
| Rank | 40 | — |
| Context | 1M | — |
| Input $/M | $0.15 | — |
| Output $/M | $0.60 | — |
| Weights | Open | Proprietary |

## Coding

- DeepSeek V4.1 Flash: 52.8 (#29)
- Gemini 2.5 Deep Think: —

| Benchmark | DeepSeek V4.1 Flash | Gemini 2.5 Deep Think |
|---|---|---|
| LMArena WebDev | 1620 | — |
| SciCode | 51.9% | — |
| LMArena Coding | 1511 | — |
| ALE-Bench | 1,092 | — |

## Reasoning

- DeepSeek V4.1 Flash: 46.2 (#39)
- Gemini 2.5 Deep Think: —

| Benchmark | DeepSeek V4.1 Flash | Gemini 2.5 Deep Think |
|---|---|---|
| NYT Connections (extended) | 89.6% | — |
| CritPt | 14.3% | — |
| LMArena Hard Prompts | 1485 | — |
| DTBench | 89.9% | — |
| LMCA | 47% | — |
| Surface Evolver Bench | 46.3% | — |
| Epoch Capabilities Index | 155.01 | — |

## Math

- DeepSeek V4.1 Flash: 48.4 (#52)
- Gemini 2.5 Deep Think: —

| Benchmark | DeepSeek V4.1 Flash | Gemini 2.5 Deep Think |
|---|---|---|
| ProofBench | 54% | — |
| LMArena Math | 1493 | — |
| FrontierMath (Feb 2025 set) | — | 29% |
| FrontierMath Tier 4 (v1) | — | 10.4% |

## Knowledge

- DeepSeek V4.1 Flash: 41.6 (#97)
- Gemini 2.5 Deep Think: —

| Benchmark | DeepSeek V4.1 Flash | Gemini 2.5 Deep Think |
|---|---|---|
| LMArena Expert | 1505 | — |

## Multilingual

- DeepSeek V4.1 Flash: 55.5 (#29)
- Gemini 2.5 Deep Think: —

| Benchmark | DeepSeek V4.1 Flash | Gemini 2.5 Deep Think |
|---|---|---|
| LMArena Non-English | 1452 | — |
| LMArena Chinese | 1506 | — |
| LMArena French | 1448 | — |
| LMArena Russian | 1473 | — |
| LMArena Spanish | 1499 | — |

## Instruction Following

- DeepSeek V4.1 Flash: 77.6 (#24)
- Gemini 2.5 Deep Think: —

| Benchmark | DeepSeek V4.1 Flash | Gemini 2.5 Deep Think |
|---|---|---|
| LMArena Instruction Following | 1475 | — |

## Long Context

- DeepSeek V4.1 Flash: 45.2 (#46)
- Gemini 2.5 Deep Think: —

| Benchmark | DeepSeek V4.1 Flash | Gemini 2.5 Deep Think |
|---|---|---|
| LMArena Longer Query | 1476 | — |

## Writing & Preference

- DeepSeek V4.1 Flash: 65.8 (#43)
- Gemini 2.5 Deep Think: —

| Benchmark | DeepSeek V4.1 Flash | Gemini 2.5 Deep Think |
|---|---|---|
| LMArena Text | 1465 | — |
| LMArena Creative Writing | 1436 | — |
| EQ-Bench Creative Writing | 1540 | — |
| LMArena Multi-Turn | 1460 | — |

## FAQ

### Is DeepSeek V4.1 Flash better than Gemini 2.5 Deep Think?

DeepSeek V4.1 Flash has enough public results to be ranked (#40); Gemini 2.5 Deep Think does not yet, so treat this comparison as directional.

### How many benchmarks do DeepSeek V4.1 Flash and Gemini 2.5 Deep Think share?

0 benchmarks have published results for both models. DeepSeek V4.1 Flash has 25 scored results on Noometry and Gemini 2.5 Deep Think has 2.