# Gemini 2.5 Pro vs Gemini 3.5 Flash

> Side-by-side benchmark comparison for Gemini 2.5 Pro and Gemini 3.5 Flash across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

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

- Shared sourced benchmarks: 6
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Pick Gemini 3.5 Flash if you want the stronger benchmark profile. Gemini 2.5 Pro only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Gemini 3.5 Flash leads overall 63.95 to 50.98.
- The clearest category separation is in coding, where the averages are 24.3 for Gemini 2.5 Pro and 52.3 for Gemini 3.5 Flash.
- The biggest single benchmark swing is Vibe Code Bench in Coding, with scores of 0.40% and 48.68%.
- Gemini 3.5 Flash is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.

## Model Snapshot

| Property | Gemini 2.5 Pro | Gemini 3.5 Flash |
|----------|----------|----------|
| Creator | Google | Google |
| Type | Proprietary | Proprietary |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 1M | 1M |
| Overall Score | 50.98 | 63.95 |
| Benchmarks Covered | 8 | 27 |
| Pricing (input/output) | $1.25 / $10.00 | $1.50 / $9.00 |

## Category Breakdown

### Agentic

- Winner: Directional only
- Gemini 2.5 Pro public-lane score: 24.5 (Estimated · #92/119)
- Gemini 3.5 Flash public-lane score: 50.7 (Supported · #42/119)

| Benchmark | Gemini 2.5 Pro | Gemini 3.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| Gert Labs | 42.01% | 61.85% | Gemini 3.5 Flash |
| Terminal-Bench 2.1 | Coming soon | 76.2% | Coming soon |
| MCP Atlas | Coming soon | 83.6% | Coming soon |
| Toolathlon | Coming soon | 56.5% | Coming soon |
| OSWorld-Verified | Coming soon | 78.4% | Coming soon |
| Finance Agent v2 | Coming soon | 57.9% | Coming soon |
| ResearchClawBench | Coming soon | 18.0% | Coming soon |
| Terminal-Bench 2.1 (Vals) | Coming soon | 74.2% | Coming soon |

### Coding

- Winner: Gemini 3.5 Flash
- Gemini 2.5 Pro public-lane score: 24.3 (Supported · #107/144)
- Gemini 3.5 Flash public-lane score: 52.3 (Supported · #39/144)

| Benchmark | Gemini 2.5 Pro | Gemini 3.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 63.8% | Coming soon | Coming soon |
| Vibe Code Bench | 0.40% | 48.68% | Gemini 3.5 Flash |
| SWE-bench (Vals) | 54.4% | 78.8% | Gemini 3.5 Flash |
| Terminal-Bench 2.1 | Coming soon | 76.2% | Coming soon |
| SWE-bench Pro | Coming soon | 55.1% | Coming soon |
| cursorBench31 | Coming soon | 49.8% | Coming soon |
| CursorBench 3.2 | Coming soon | 48.8% | Coming soon |
| LiveCodeBench (Vals) | Coming soon | 87.6% | Coming soon |

### Reasoning

- Winner: Not comparable
- Gemini 2.5 Pro public-lane score: 69.7 (Unranked · 2 rankable rows)
- Gemini 3.5 Flash public-lane score: 62.8 (#20/27)

| Benchmark | Gemini 2.5 Pro | Gemini 3.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| MRCRv2 | Coming soon | 77.3% | Coming soon |
| MRCR 1M | Coming soon | 26.6% | Coming soon |
| ARC-AGI-2 | Coming soon | 72.1% | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- Gemini 2.5 Pro public-lane score: 71.4 (Unranked · 1 rankable row)
- Gemini 3.5 Flash public-lane score: 87.8 (#6/49)

| Benchmark | Gemini 2.5 Pro | Gemini 3.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| CharXiv | Coming soon | 84.2% | Coming soon |
| MMMU-Pro | Coming soon | 83.6% | Coming soon |
| Blueprint-Bench 2 | Coming soon | 33.6% | Coming soon |

### Knowledge

- Winner: Gemini 3.5 Flash
- Gemini 2.5 Pro public-lane score: 44 (Supported · #84/171)
- Gemini 3.5 Flash public-lane score: 64 (Supported · #30/171)

| Benchmark | Gemini 2.5 Pro | Gemini 3.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 83% | Coming soon | Coming soon |
| HLE | 18.8% | 40.2% | Gemini 3.5 Flash |
| GPQA-D | Coming soon | 92.7% | Coming soon |
| GPQA Diamond (Vals) | Coming soon | 92.7% | Coming soon |
| MMLU-Pro (Vals) | Coming soon | 89.5% | Coming soon |

### Instruction Following

- Winner: Directional only
- Gemini 2.5 Pro public-lane score: 56.4 (#76/125)
- Gemini 3.5 Flash public-lane score: 84.1 (#43/125)

### Mathematics

- Winner: Not comparable
- Gemini 2.5 Pro public-lane score: 35.1 (Unranked · 2 rankable rows)
- Gemini 3.5 Flash public-lane score: 55.1 (Unranked · 2 rankable rows)

| Benchmark | Gemini 2.5 Pro | Gemini 3.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 14.138% | 38.966% | Gemini 3.5 Flash |
| FrontierMath v2 (Tier 4) | 4.167% | 14.583% | Gemini 3.5 Flash |

## FAQ

### Which is better overall, Gemini 2.5 Pro or Gemini 3.5 Flash?

Gemini 3.5 Flash is ahead overall on BenchLM right now.

### Where is the biggest gap between Gemini 2.5 Pro and Gemini 3.5 Flash?

The widest category gap is in coding, where the averages are 24.3 for Gemini 2.5 Pro and 52.3 for Gemini 3.5 Flash.

### How many benchmarks does Gemini 2.5 Pro cover on BenchLM?

Gemini 2.5 Pro currently has 8 sourced benchmark scores on BenchLM.

### How many benchmarks does Gemini 3.5 Flash cover on BenchLM?

Gemini 3.5 Flash currently has 27 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Gemini 2.5 Pro vs Gemini 3.5 Flash Cyber](/compare/gemini-2-5-pro-vs-gemini-3-5-flash-cyber)
- [Gemini 3.5 Flash vs Gemini 3.5 Flash Cyber](/compare/gemini-3-5-flash-vs-gemini-3-5-flash-cyber)
- [Gemini 2.5 Pro vs GPT-6 Astra](/compare/gemini-2-5-pro-vs-gpt-6-astra)
- [Gemini 3.5 Flash vs GPT-6 Astra](/compare/gemini-3-5-flash-vs-gpt-6-astra)

## Explore More

- [Gemini 2.5 Pro profile](/models/gemini-2-5-pro)
- [Gemini 3.5 Flash profile](/models/gemini-3-5-flash)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)