# GPT-OSS 20B vs MiMo-V2-Flash

> Side-by-side benchmark comparison for GPT-OSS 20B and MiMo-V2-Flash across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-oss-20b-vs-mimo-v2-flash
- Last updated: October 17, 2026

- Shared sourced benchmarks: 3
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Evidence is too thin for a benchmark verdict: GPT-OSS 20B and MiMo-V2-Flash share only 3 sourced benchmark rows.

## Summary

- Only 3 shared sourced benchmark rows are available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- MiMo-V2-Flash has the larger published context window at 256K.

## Model Snapshot

| Property | GPT-OSS 20B | MiMo-V2-Flash |
|----------|----------|----------|
| Creator | OpenAI | Xiaomi |
| Type | Open Weight | Open Weight |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 128K | 256K |
| Independent public score (not head-to-head) | 33.32 | 41 |
| Benchmarks Covered | 7 | 8 |
| Pricing (input/output) | $0.00 / $0.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- GPT-OSS 20B public-lane score: 14.9 (Estimated · #115/128)
- MiMo-V2-Flash public-lane score: Coming soon

### Coding

- Winner: Insufficient shared evidence
- GPT-OSS 20B public-lane score: 18.2 (Estimated · #123/150)
- MiMo-V2-Flash public-lane score: 28.5 (Estimated · #98/150)

| Benchmark | GPT-OSS 20B | MiMo-V2-Flash | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 60.7% | 73.4% | MiMo-V2-Flash |
| React Native Evals | 71% | Coming soon | Coming soon |
| LiveCodeBench v6 | Coming soon | 80.6% | Coming soon |
| SWE Multilingual | Coming soon | 71.7% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- GPT-OSS 20B public-lane score: 49.7 (Unranked · 2 rankable rows)
- MiMo-V2-Flash public-lane score: 58.1 (Unranked · 3 rankable rows)

| Benchmark | GPT-OSS 20B | MiMo-V2-Flash | Winner |
|-----------|-----------|-----------|--------|
| LongBench v2 | Coming soon | 60.6% | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- GPT-OSS 20B public-lane score: 33.9 (Supported · #140/184)
- MiMo-V2-Flash public-lane score: 34.9 (Supported · #135/184)

| Benchmark | GPT-OSS 20B | MiMo-V2-Flash | Winner |
|-----------|-----------|-----------|--------|
| MMLU | 85.3% | Coming soon | Coming soon |
| GPQA | 71.5% | 83.7% | MiMo-V2-Flash |
| HLE | 10.9% | Coming soon | Coming soon |
| MMLU-Pro | Coming soon | 84.9% | Coming soon |
| GPQA Diamond (Vals) | Coming soon | 59.3% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- GPT-OSS 20B public-lane score: 79.2 (#60/148)
- MiMo-V2-Flash public-lane score: 46.3 (#102/148)

### Mathematics

- Winner: Insufficient shared evidence
- GPT-OSS 20B public-lane score: Coming soon
- MiMo-V2-Flash public-lane score: Coming soon

| Benchmark | GPT-OSS 20B | MiMo-V2-Flash | Winner |
|-----------|-----------|-----------|--------|
| AIME 2024 | 92.1% | Coming soon | Coming soon |
| AIME 2025 | 91.7% | 94.1% | MiMo-V2-Flash |

## FAQ

### Is there enough evidence to pick between GPT-OSS 20B and MiMo-V2-Flash?

Not yet. The models share only 3 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

- [GPT-OSS 20B vs GPT-OSS 120B](/compare/gpt-oss-120b-vs-gpt-oss-20b)
- [MiMo-V2-Flash vs GPT-OSS 120B](/compare/gpt-oss-120b-vs-mimo-v2-flash)
- [GPT-OSS 20B vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-gpt-oss-20b)
- [MiMo-V2-Flash vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-mimo-v2-flash)

## Explore More

- [GPT-OSS 20B profile](/models/gpt-oss-20b)
- [MiMo-V2-Flash profile](/models/mimo-v2-flash)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)