# DeepSeek V3.1 (Reasoning) vs Gemini 1.5 Flash

> Side-by-side benchmark comparison for DeepSeek V3.1 (Reasoning) and Gemini 1.5 Flash across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/deepseek-v3-1-reasoning-vs-gemini-1-5-flash
- Last updated: October 14, 2026

- Shared sourced benchmarks: 2
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Evidence is too thin for a benchmark verdict: DeepSeek V3.1 (Reasoning) and Gemini 1.5 Flash share only 2 sourced benchmark rows.

## Summary

- Only 2 shared sourced benchmark rows are available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- Gemini 1.5 Flash has the larger published context window at 1M.

## Model Snapshot

| Property | DeepSeek V3.1 (Reasoning) | Gemini 1.5 Flash |
|----------|----------|----------|
| Creator | DeepSeek | Google |
| Type | Open Weight | Proprietary |
| Reasoning | Reasoning | Non-Reasoning |
| Context | 128K | 1M |
| Independent public score (not head-to-head) | 39.06 | null |
| Benchmarks Covered | 6 | 5 |
| Pricing (input/output) | $0.00 / $0.00 | N/A |

## Category Breakdown

### Coding

- Winner: Insufficient shared evidence
- DeepSeek V3.1 (Reasoning) public-lane score: Coming soon
- Gemini 1.5 Flash public-lane score: Coming soon

| Benchmark | DeepSeek V3.1 (Reasoning) | Gemini 1.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| LiveCodeBench | 74.8% | Coming soon | Coming soon |
| SWE-bench Verified | Coming soon | 9.6% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- DeepSeek V3.1 (Reasoning) public-lane score: 64.8 (Unranked · 2 rankable rows)
- Gemini 1.5 Flash public-lane score: Coming soon

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- DeepSeek V3.1 (Reasoning) public-lane score: Coming soon
- Gemini 1.5 Flash public-lane score: Coming soon

| Benchmark | DeepSeek V3.1 (Reasoning) | Gemini 1.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| MMMU | Coming soon | 58.3% | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- DeepSeek V3.1 (Reasoning) public-lane score: 40.6 (Supported · #114/181)
- Gemini 1.5 Flash public-lane score: Coming soon

| Benchmark | DeepSeek V3.1 (Reasoning) | Gemini 1.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 80.1% | 50% | DeepSeek V3.1 (Reasoning) |
| MMLU-Pro | 84.8% | Coming soon | Coming soon |
| HLE | 15.9% | Coming soon | Coming soon |
| SimpleQA | Coming soon | 8.6% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- DeepSeek V3.1 (Reasoning) public-lane score: 48.4 (#85/128)
- Gemini 1.5 Flash public-lane score: Coming soon

### Mathematics

- Winner: Insufficient shared evidence
- DeepSeek V3.1 (Reasoning) public-lane score: Coming soon
- Gemini 1.5 Flash public-lane score: Coming soon

| Benchmark | DeepSeek V3.1 (Reasoning) | Gemini 1.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| AIME 2024 | 93.1% | Coming soon | Coming soon |
| AIME 2025 | 88.4% | 14.7% | DeepSeek V3.1 (Reasoning) |

## FAQ

### Is there enough evidence to pick between DeepSeek V3.1 (Reasoning) and Gemini 1.5 Flash?

Not yet. The models share only 2 sourced benchmark rows, so this mirror reports the available measurements and metadata without naming a broad winner.

### What can I compare safely on this page?

Published pricing, context windows, model type, and individual shared benchmark rows are directly comparable. Independent overall scores and non-overlapping benchmark coverage are labeled separately and should not be read as a controlled head-to-head result.

## Related Comparisons

- [DeepSeek V3.1 (Reasoning) vs DeepSeek V3.1](/compare/deepseek-v3-1-vs-deepseek-v3-1-reasoning)
- [Gemini 1.5 Flash vs DeepSeek V3.1](/compare/deepseek-v3-1-vs-gemini-1-5-flash)
- [DeepSeek V3.1 (Reasoning) vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-deepseek-v3-1-reasoning)
- [Gemini 1.5 Flash vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-gemini-1-5-flash)

## Explore More

- [DeepSeek V3.1 (Reasoning) profile](/models/deepseek-v3-1-reasoning)
- [Gemini 1.5 Flash profile](/models/gemini-1-5-flash)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)