# Gemini 3 Flash vs o3-mini

> Side-by-side benchmark comparison for Gemini 3 Flash and o3-mini across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gemini-3-flash-vs-o3-mini
- Last updated: September 10, 2026

- Shared sourced benchmarks: 0
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

No benchmark verdict yet: there is no shared sourced benchmark row for Gemini 3 Flash and o3-mini.

## Summary

- Gemini 3 Flash and o3-mini do not currently share a sourced benchmark row. The mirror therefore compares metadata, pricing, context windows, and each model's separately reported coverage without naming a benchmark winner.

## Model Snapshot

| Property | Gemini 3 Flash | o3-mini |
|----------|----------|----------|
| Creator | Google | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 1M | 200K |
| Independent public score (not head-to-head) | 62.2 | 46.83 |
| Benchmarks Covered | 11 | 5 |
| Pricing (input/output) | $0.50 / $3.00 | $1.10 / $4.40 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Gemini 3 Flash public-lane score: 34 (Supported · #134/152)
- o3-mini public-lane score: Coming soon

| Benchmark | Gemini 3 Flash | o3-mini | Winner |
|-----------|-----------|-----------|--------|
| Claw-Eval | 49.2% | Coming soon | Coming soon |
| Gert Labs | 56.63% | Coming soon | Coming soon |
| JobBench | 11.4% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 53.9% | Coming soon | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Gemini 3 Flash public-lane score: 41.5 (Supported · #108/151)
- o3-mini public-lane score: 45.3 (Estimated · #88/151)

| Benchmark | Gemini 3 Flash | o3-mini | Winner |
|-----------|-----------|-----------|--------|
| Vibe Code Bench | 20.20% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 85.6% | Coming soon | Coming soon |
| SWE-bench (Vals) | 75.0% | Coming soon | Coming soon |
| SWE-bench Verified | Coming soon | 49.3% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Gemini 3 Flash public-lane score: 75.8 (Unranked · 1 rankable row)
- o3-mini public-lane score: Coming soon

### Reasoning

- Winner: Insufficient shared evidence
- Gemini 3 Flash public-lane score: 59 (Unranked · 2 rankable rows)
- o3-mini public-lane score: Coming soon

### Knowledge

- Winner: Insufficient shared evidence
- Gemini 3 Flash public-lane score: 56.9 (Supported · #45/183)
- o3-mini public-lane score: 39.7 (Supported · #134/183)

| Benchmark | Gemini 3 Flash | o3-mini | Winner |
|-----------|-----------|-----------|--------|
| GPQA Diamond (Vals) | 87.9% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 88.6% | Coming soon | Coming soon |
| MMLU | Coming soon | 86.9% | Coming soon |
| GPQA | Coming soon | 77.2% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Gemini 3 Flash public-lane score: 66.2 (#68/123)
- o3-mini public-lane score: Coming soon

| Benchmark | Gemini 3 Flash | o3-mini | Winner |
|-----------|-----------|-----------|--------|
| IFEval | Coming soon | 93.9% | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- Gemini 3 Flash public-lane score: 50.2 (Unranked · 2 rankable rows)
- o3-mini public-lane score: Coming soon

| Benchmark | Gemini 3 Flash | o3-mini | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 35.640% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 4.167% | Coming soon | Coming soon |
| AIME 2024 | Coming soon | 87.3% | Coming soon |

## FAQ

### Can I compare Gemini 3 Flash and o3-mini on BenchLM yet?

Not fully yet. BenchLM is tracking both models, but sourced benchmark coverage is still incomplete for a fair score-level comparison.

### Why does this page show "coming soon" values?

BenchLM only calls winners when public benchmark coverage is available on both sides of the comparison.

## Related Comparisons

- [Gemini 3 Flash vs o3](/compare/gemini-3-flash-vs-o3)
- [o3-mini vs o3](/compare/o3-vs-o3-mini)
- [Gemini 3 Flash vs o3-pro](/compare/gemini-3-flash-vs-o3-pro)
- [o3-mini vs o3-pro](/compare/o3-mini-vs-o3-pro)

## Explore More

- [Gemini 3 Flash profile](/models/gemini-3-flash)
- [o3-mini profile](/models/o3-mini)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)