# Gemini 3.1 Flash-Lite vs GPT-OSS 120B

> Side-by-side benchmark comparison for Gemini 3.1 Flash-Lite and GPT-OSS 120B across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gemini-3-1-flash-lite-vs-gpt-oss-120b
- Last updated: October 17, 2026

- Shared sourced benchmarks: 1
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Evidence is too thin for a benchmark verdict: Gemini 3.1 Flash-Lite and GPT-OSS 120B share only 1 sourced benchmark row.

## Summary

- Only 1 shared sourced benchmark row is available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- GPT-OSS 120B has the lower published output-token price.
- Gemini 3.1 Flash-Lite has the larger published context window at 1M.

## Model Snapshot

| Property | Gemini 3.1 Flash-Lite | GPT-OSS 120B |
|----------|----------|----------|
| Creator | Google | OpenAI |
| Type | Proprietary | Open Weight |
| Reasoning | Non-Reasoning | Non-Reasoning |
| Context | 1M | 128K |
| Independent public score (not head-to-head) | 46.96 | 37.32 |
| Benchmarks Covered | 11 | 8 |
| Pricing (input/output) | $0.25 / $1.50 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Gemini 3.1 Flash-Lite public-lane score: 27.4 (Estimated · #100/128)
- GPT-OSS 120B public-lane score: 19.5 (Estimated · #110/128)

| Benchmark | Gemini 3.1 Flash-Lite | GPT-OSS 120B | Winner |
|-----------|-----------|-----------|--------|
| Gert Labs | 38.46% | 29.61% | Gemini 3.1 Flash-Lite |
| Terminal-Bench 2.1 (Vals) | 34.1% | Coming soon | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Gemini 3.1 Flash-Lite public-lane score: 27.2 (Estimated · #101/150)
- GPT-OSS 120B public-lane score: 23 (Estimated · #111/150)

| Benchmark | Gemini 3.1 Flash-Lite | GPT-OSS 120B | Winner |
|-----------|-----------|-----------|--------|
| Vibe Code Bench | 0.00% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 80.1% | Coming soon | Coming soon |
| SWE-bench (Vals) | 62.8% | Coming soon | Coming soon |
| SWE-bench Verified | Coming soon | 62.4% | Coming soon |
| React Native Evals | Coming soon | 71.6% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Gemini 3.1 Flash-Lite public-lane score: Coming soon
- GPT-OSS 120B public-lane score: 61.6 (Unranked · 2 rankable rows)

| Benchmark | Gemini 3.1 Flash-Lite | GPT-OSS 120B | Winner |
|-----------|-----------|-----------|--------|
| JevBench 1.4 | 14.26 | Coming soon | Coming soon |
| JevBench 1.5 | 19.58 | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Gemini 3.1 Flash-Lite public-lane score: 42 (Unranked · 1 rankable row)
- GPT-OSS 120B public-lane score: Coming soon

| Benchmark | Gemini 3.1 Flash-Lite | GPT-OSS 120B | Winner |
|-----------|-----------|-----------|--------|
| CharXiv | 73.2% | Coming soon | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Gemini 3.1 Flash-Lite public-lane score: 46.9 (Estimated · #89/184)
- GPT-OSS 120B public-lane score: 38.6 (Supported · #122/184)

| Benchmark | Gemini 3.1 Flash-Lite | GPT-OSS 120B | Winner |
|-----------|-----------|-----------|--------|
| GPQA Diamond (Vals) | 81.1% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 86.2% | Coming soon | Coming soon |
| MMLU | Coming soon | 90% | Coming soon |
| GPQA | Coming soon | 80.1% | Coming soon |
| HLE | Coming soon | 14.9% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Gemini 3.1 Flash-Lite public-lane score: Coming soon
- GPT-OSS 120B public-lane score: 84.3 (#50/148)

### Mathematics

- Winner: Insufficient shared evidence
- Gemini 3.1 Flash-Lite public-lane score: 44 (Unranked · 1 rankable row)
- GPT-OSS 120B public-lane score: Coming soon

| Benchmark | Gemini 3.1 Flash-Lite | GPT-OSS 120B | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 27.719% | Coming soon | Coming soon |
| AIME 2024 | Coming soon | 95.8% | Coming soon |
| AIME 2025 | Coming soon | 92.5% | Coming soon |

## FAQ

### Is there enough evidence to pick between Gemini 3.1 Flash-Lite and GPT-OSS 120B?

Not yet. The models share only 1 sourced benchmark row, 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 3.1 Flash-Lite vs GPT-OSS 20B](/compare/gemini-3-1-flash-lite-vs-gpt-oss-20b)
- [GPT-OSS 120B vs GPT-OSS 20B](/compare/gpt-oss-120b-vs-gpt-oss-20b)
- [Gemini 3.1 Flash-Lite vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-gemini-3-1-flash-lite)
- [GPT-OSS 120B vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-gpt-oss-120b)

## Explore More

- [Gemini 3.1 Flash-Lite profile](/models/gemini-3-1-flash-lite)
- [GPT-OSS 120B profile](/models/gpt-oss-120b)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)