# Gemini 2.5 Pro vs Gemini 3 Flash

> Side-by-side benchmark comparison for Gemini 2.5 Pro and Gemini 3 Flash across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gemini-2-5-pro-vs-gemini-3-flash
- Last updated: September 29, 2026

- Shared sourced benchmarks: 5
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

Pick Gemini 3 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 Flash leads overall 55.5 to 50.17.
- The clearest category separation is in mathematics, where the averages are 35.1 for Gemini 2.5 Pro and 50 for Gemini 3 Flash.
- The biggest single benchmark swing is FrontierMath v2 (Tiers 1-3) in Mathematics, with scores of 14.138% and 35.640%.
- Gemini 3 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 Flash |
|----------|----------|----------|
| Creator | Google | Google |
| Type | Proprietary | Proprietary |
| Reasoning | Non-Reasoning | Non-Reasoning |
| Context | 1M | 1M |
| Overall Score | 50.17 | 55.5 |
| Benchmarks Covered | 8 | 11 |
| Pricing (input/output) | $1.25 / $10.00 | $0.50 / $3.00 |

## Category Breakdown

### Agentic

- Winner: Directional only
- Gemini 2.5 Pro public-lane score: 25.4 (Estimated · #91/117)
- Gemini 3 Flash public-lane score: 31.7 (Supported · #76/117)

| Benchmark | Gemini 2.5 Pro | Gemini 3 Flash | Winner |
|-----------|-----------|-----------|--------|
| Gert Labs | 42.01% | 56.63% | Gemini 3 Flash |
| Claw-Eval | Coming soon | 49.2% | Coming soon |
| JobBench | Coming soon | 11.4% | Coming soon |
| Terminal-Bench 2.1 (Vals) | Coming soon | 53.9% | Coming soon |

### Coding

- Winner: Gemini 3 Flash
- Gemini 2.5 Pro public-lane score: 24.4 (Supported · #108/143)
- Gemini 3 Flash public-lane score: 36.4 (Supported · #74/143)

| Benchmark | Gemini 2.5 Pro | Gemini 3 Flash | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 63.8% | Coming soon | Coming soon |
| Vibe Code Bench | 0.40% | 20.20% | Gemini 3 Flash |
| SWE-bench (Vals) | 54.4% | 75.0% | Gemini 3 Flash |
| LiveCodeBench (Vals) | Coming soon | 85.6% | Coming soon |

### Reasoning

- Winner: Not comparable
- Gemini 2.5 Pro public-lane score: 69.7 (Unranked · 2 rankable rows)
- Gemini 3 Flash public-lane score: 60.3 (Unranked · 2 rankable rows)

### Multimodal & Grounded

- Winner: Not comparable
- Gemini 2.5 Pro public-lane score: 71.4 (Unranked · 1 rankable row)
- Gemini 3 Flash public-lane score: 76.9 (Unranked · 1 rankable row)

### Knowledge

- Winner: Gemini 3 Flash
- Gemini 2.5 Pro public-lane score: 44.1 (Supported · #80/169)
- Gemini 3 Flash public-lane score: 54.3 (Supported · #47/169)

| Benchmark | Gemini 2.5 Pro | Gemini 3 Flash | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 83% | Coming soon | Coming soon |
| HLE | 18.8% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | Coming soon | 87.9% | Coming soon |
| MMLU-Pro (Vals) | Coming soon | 88.6% | Coming soon |

### Instruction Following

- Winner: Directional only
- Gemini 2.5 Pro public-lane score: 56.4 (#76/124)
- Gemini 3 Flash public-lane score: 64.7 (#70/124)

### Mathematics

- Winner: Not comparable
- Gemini 2.5 Pro public-lane score: 35.1 (Unranked · 2 rankable rows)
- Gemini 3 Flash public-lane score: 50 (Unranked · 2 rankable rows)

| Benchmark | Gemini 2.5 Pro | Gemini 3 Flash | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 14.138% | 35.640% | Gemini 3 Flash |
| FrontierMath v2 (Tier 4) | 4.167% | 4.167% | Tie |

## FAQ

### Which is better overall, Gemini 2.5 Pro or Gemini 3 Flash?

Gemini 3 Flash is ahead overall on BenchLM right now.

### Where is the biggest gap between Gemini 2.5 Pro and Gemini 3 Flash?

The widest category gap is in mathematics, where the averages are 35.1 for Gemini 2.5 Pro and 50 for Gemini 3 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 Flash cover on BenchLM?

Gemini 3 Flash currently has 11 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Gemini 2.5 Pro vs GPT-6 Astra](/compare/gemini-2-5-pro-vs-gpt-6-astra)
- [Gemini 3 Flash vs GPT-6 Astra](/compare/gemini-3-flash-vs-gpt-6-astra)
- [Gemini 2.5 Pro vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-gemini-2-5-pro)
- [Gemini 3 Flash vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-gemini-3-flash)

## Explore More

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