# Gemini 3 Flash vs GPT-5.1

> Side-by-side benchmark comparison for Gemini 3 Flash and GPT-5.1 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gemini-3-flash-vs-gpt-5-1
- Last updated: October 17, 2026

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

## Quick Verdict

Evidence is too thin for a benchmark verdict: Gemini 3 Flash and GPT-5.1 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 3 Flash has the lower published output-token price.
- Gemini 3 Flash has the larger published context window at 1M.

## Model Snapshot

| Property | Gemini 3 Flash | GPT-5.1 |
|----------|----------|----------|
| Creator | Google | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 1M | 200K |
| Independent public score (not head-to-head) | 54.28 | 57.21 |
| Benchmarks Covered | 11 | 3 |
| Pricing (input/output) | $0.50 / $3.00 | $1.25 / $10.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Gemini 3 Flash public-lane score: 32.4 (Supported · #88/128)
- GPT-5.1 public-lane score: Coming soon

| Benchmark | Gemini 3 Flash | GPT-5.1 | Winner |
|-----------|-----------|-----------|--------|
| Claw-Eval | 49.2% | Coming soon | Coming soon |
| Gert Labs | 56.63% | 41.24% | Gemini 3 Flash |
| 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: 32.1 (Supported · #88/150)
- GPT-5.1 public-lane score: 36.1 (Supported · #75/150)

| Benchmark | Gemini 3 Flash | GPT-5.1 | Winner |
|-----------|-----------|-----------|--------|
| Vibe Code Bench | 20.20% | 24.61% | GPT-5.1 |
| LiveCodeBench (Vals) | 85.6% | Coming soon | Coming soon |
| SWE-bench (Vals) | 75.0% | Coming soon | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Gemini 3 Flash public-lane score: 63.8 (Unranked · 2 rankable rows)
- GPT-5.1 public-lane score: 80.8 (Unranked · 3 rankable rows)

| Benchmark | Gemini 3 Flash | GPT-5.1 | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-1 | Coming soon | 72.83% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Gemini 3 Flash public-lane score: 80.3 (Unranked · 1 rankable row)
- GPT-5.1 public-lane score: 75.7 (Unranked · 1 rankable row)

### Knowledge

- Winner: Insufficient shared evidence
- Gemini 3 Flash public-lane score: 55.7 (Supported · #55/184)
- GPT-5.1 public-lane score: 53.3 (Estimated · #67/184)

| Benchmark | Gemini 3 Flash | GPT-5.1 | Winner |
|-----------|-----------|-----------|--------|
| GPQA Diamond (Vals) | 87.9% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 88.6% | Coming soon | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Gemini 3 Flash public-lane score: 66.1 (#76/148)
- GPT-5.1 public-lane score: 89.4 (#30/148)

### Mathematics

- Winner: Insufficient shared evidence
- Gemini 3 Flash public-lane score: 57.4 (Unranked · 2 rankable rows)
- GPT-5.1 public-lane score: Coming soon

| Benchmark | Gemini 3 Flash | GPT-5.1 | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 51.228% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 17.073% | Coming soon | Coming soon |

## FAQ

### Is there enough evidence to pick between Gemini 3 Flash and GPT-5.1?

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

- [Gemini 3 Flash vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-gemini-3-flash)
- [GPT-5.1 vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-gpt-5-1)
- [Gemini 3 Flash vs GPT-6.1 Sol](/compare/gemini-3-flash-vs-gpt-6-1-sol)
- [GPT-5.1 vs GPT-6.1 Sol](/compare/gpt-5-1-vs-gpt-6-1-sol)

## Explore More

- [Gemini 3 Flash profile](/models/gemini-3-flash)
- [GPT-5.1 profile](/models/gpt-5-1)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)