# Gemini 3.5 Flash vs Kimi K2.5 (Reasoning)

> Side-by-side benchmark comparison for Gemini 3.5 Flash and Kimi K2.5 (Reasoning) across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gemini-3-5-flash-vs-kimi-k2-5-reasoning
- Last updated: October 2, 2026

- Shared sourced benchmarks: 3
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Evidence is too thin for a benchmark verdict: Gemini 3.5 Flash and Kimi K2.5 (Reasoning) share only 3 sourced benchmark rows.

## Summary

- Only 3 shared sourced benchmark rows are available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- Kimi K2.5 (Reasoning) has the lower published output-token price.
- Gemini 3.5 Flash has the larger published context window at 1M.

## Model Snapshot

| Property | Gemini 3.5 Flash | Kimi K2.5 (Reasoning) |
|----------|----------|----------|
| Creator | Google | Moonshot AI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 128K |
| Independent public score (not head-to-head) | 63.95 | null |
| Benchmarks Covered | 27 | 9 |
| Pricing (input/output) | $1.50 / $9.00 | $0.60 / $3.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Gemini 3.5 Flash public-lane score: 50.7 (Supported · #42/119)
- Kimi K2.5 (Reasoning) public-lane score: Coming soon

| Benchmark | Gemini 3.5 Flash | Kimi K2.5 (Reasoning) | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 76.2% | Coming soon | Coming soon |
| MCP Atlas | 83.6% | Coming soon | Coming soon |
| Toolathlon | 56.5% | Coming soon | Coming soon |
| OSWorld-Verified | 78.4% | Coming soon | Coming soon |
| Finance Agent v2 | 57.9% | Coming soon | Coming soon |
| Gert Labs | 61.85% | 32.58% | Gemini 3.5 Flash |
| ResearchClawBench | 18.0% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 74.2% | Coming soon | Coming soon |
| Terminal-Bench 2.0 | Coming soon | 50.8% | Coming soon |
| BrowseComp | Coming soon | 60.6% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Gemini 3.5 Flash public-lane score: 52.3 (Supported · #39/144)
- Kimi K2.5 (Reasoning) public-lane score: Coming soon

| Benchmark | Gemini 3.5 Flash | Kimi K2.5 (Reasoning) | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 76.2% | Coming soon | Coming soon |
| SWE-bench Pro | 55.1% | Coming soon | Coming soon |
| Vibe Code Bench | 48.68% | 17.54% | Gemini 3.5 Flash |
| cursorBench31 | 49.8% | Coming soon | Coming soon |
| CursorBench 3.2 | 48.8% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 87.6% | Coming soon | Coming soon |
| SWE-bench (Vals) | 78.8% | Coming soon | Coming soon |
| SWE-bench Verified | Coming soon | 76.8% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Gemini 3.5 Flash public-lane score: 62.8 (#20/27)
- Kimi K2.5 (Reasoning) public-lane score: Coming soon

| Benchmark | Gemini 3.5 Flash | Kimi K2.5 (Reasoning) | Winner |
|-----------|-----------|-----------|--------|
| MRCRv2 | 77.3% | Coming soon | Coming soon |
| MRCR 1M | 26.6% | Coming soon | Coming soon |
| ARC-AGI-2 | 72.1% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Gemini 3.5 Flash public-lane score: 87.8 (#6/49)
- Kimi K2.5 (Reasoning) public-lane score: 64.4 (Unranked · 1 rankable row)

| Benchmark | Gemini 3.5 Flash | Kimi K2.5 (Reasoning) | Winner |
|-----------|-----------|-----------|--------|
| CharXiv | 84.2% | Coming soon | Coming soon |
| MMMU-Pro | 83.6% | 78.5% | Gemini 3.5 Flash |
| Blueprint-Bench 2 | 33.6% | Coming soon | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Gemini 3.5 Flash public-lane score: 64 (Supported · #30/171)
- Kimi K2.5 (Reasoning) public-lane score: Coming soon

| Benchmark | Gemini 3.5 Flash | Kimi K2.5 (Reasoning) | Winner |
|-----------|-----------|-----------|--------|
| GPQA-D | 92.7% | Coming soon | Coming soon |
| HLE | 40.2% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | 92.7% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 89.5% | Coming soon | Coming soon |
| GPQA | Coming soon | 87.6% | Coming soon |
| MMLU-Pro | Coming soon | 87.1% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Gemini 3.5 Flash public-lane score: 84.1 (#43/125)
- Kimi K2.5 (Reasoning) public-lane score: Coming soon

### Mathematics

- Winner: Insufficient shared evidence
- Gemini 3.5 Flash public-lane score: 55.1 (Unranked · 2 rankable rows)
- Kimi K2.5 (Reasoning) public-lane score: Coming soon

| Benchmark | Gemini 3.5 Flash | Kimi K2.5 (Reasoning) | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 38.966% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 14.583% | Coming soon | Coming soon |
| AIME 2025 | Coming soon | 96.1% | Coming soon |

## FAQ

### Is there enough evidence to pick between Gemini 3.5 Flash and Kimi K2.5 (Reasoning)?

Not yet. The models share only 3 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

- [Gemini 3.5 Flash vs Gemini 3.5 Flash Cyber](/compare/gemini-3-5-flash-vs-gemini-3-5-flash-cyber)
- [Kimi K2.5 (Reasoning) vs Gemini 3.5 Flash Cyber](/compare/gemini-3-5-flash-cyber-vs-kimi-k2-5-reasoning)
- [Gemini 3.5 Flash vs Kimi K2.5](/compare/gemini-3-5-flash-vs-kimi-k2-5)
- [Kimi K2.5 (Reasoning) vs Kimi K2.5](/compare/kimi-k2-5-vs-kimi-k2-5-reasoning)

## Explore More

- [Gemini 3.5 Flash profile](/models/gemini-3-5-flash)
- [Kimi K2.5 (Reasoning) profile](/models/kimi-k2-5-reasoning)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)