# Mellum2-12B-A2.5B-Instruct vs MiMo-V2-Flash

> Side-by-side benchmark comparison for Mellum2-12B-A2.5B-Instruct and MiMo-V2-Flash across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/mellum2-12b-a2-5b-instruct-vs-mimo-v2-flash
- Last updated: September 4, 2026

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

## Quick Verdict

Evidence is too thin for a benchmark verdict: Mellum2-12B-A2.5B-Instruct and MiMo-V2-Flash 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.
- MiMo-V2-Flash has the larger published context window at 256K.

## Model Snapshot

| Property | Mellum2-12B-A2.5B-Instruct | MiMo-V2-Flash |
|----------|----------|----------|
| Creator | JetBrains | Xiaomi |
| Type | Open Weight | Open Weight |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 128K | 256K |
| Independent public score (not head-to-head) | null | 52.18 |
| Benchmarks Covered | 6 | 4 |
| Pricing (input/output) | N/A | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Mellum2-12B-A2.5B-Instruct public-lane score: 47.8 (Estimated · #82/151)
- MiMo-V2-Flash public-lane score: 49.6 (Estimated · #68/151)

| Benchmark | Mellum2-12B-A2.5B-Instruct | MiMo-V2-Flash | Winner |
|-----------|-----------|-----------|--------|
| BFCL v4 | 44.2% | Coming soon | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Mellum2-12B-A2.5B-Instruct public-lane score: Coming soon
- MiMo-V2-Flash public-lane score: 51.9 (Estimated · #59/183)

| Benchmark | Mellum2-12B-A2.5B-Instruct | MiMo-V2-Flash | Winner |
|-----------|-----------|-----------|--------|
| LiveCodeBench v6 | 37.2% | Coming soon | Coming soon |
| SWE-bench Verified | Coming soon | 73.4% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Mellum2-12B-A2.5B-Instruct public-lane score: Coming soon
- MiMo-V2-Flash public-lane score: 46.2 (Unranked · 2 rankable rows)

### Knowledge

- Winner: Insufficient shared evidence
- Mellum2-12B-A2.5B-Instruct public-lane score: 48.1 (Estimated · #103/181)
- MiMo-V2-Flash public-lane score: 43.9 (Estimated · #122/181)

| Benchmark | Mellum2-12B-A2.5B-Instruct | MiMo-V2-Flash | Winner |
|-----------|-----------|-----------|--------|
| MMLU-Redux | 78.1% | Coming soon | Coming soon |
| GPQA | 40.9% | 83.7% | MiMo-V2-Flash |
| GPQA-D | 40.9% | Coming soon | Coming soon |
| MMLU-Pro | Coming soon | 84.9% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Mellum2-12B-A2.5B-Instruct public-lane score: Coming soon
- MiMo-V2-Flash public-lane score: 46.2 (#87/120)

| Benchmark | Mellum2-12B-A2.5B-Instruct | MiMo-V2-Flash | Winner |
|-----------|-----------|-----------|--------|
| IFEval | 75.8% | Coming soon | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- Mellum2-12B-A2.5B-Instruct public-lane score: Coming soon
- MiMo-V2-Flash public-lane score: Coming soon

| Benchmark | Mellum2-12B-A2.5B-Instruct | MiMo-V2-Flash | Winner |
|-----------|-----------|-----------|--------|
| AIME 2025 | Coming soon | 94.1% | Coming soon |

## FAQ

### Is there enough evidence to pick between Mellum2-12B-A2.5B-Instruct and MiMo-V2-Flash?

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

- [Mellum2-12B-A2.5B-Instruct vs Mellum2-12B-A2.5B-Thinking](/compare/mellum2-12b-a2-5b-instruct-vs-mellum2-12b-a2-5b-thinking)
- [MiMo-V2-Flash vs Mellum2-12B-A2.5B-Thinking](/compare/mellum2-12b-a2-5b-thinking-vs-mimo-v2-flash)
- [Mellum2-12B-A2.5B-Instruct vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-mellum2-12b-a2-5b-instruct)
- [MiMo-V2-Flash vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-mimo-v2-flash)

## Explore More

- [Mellum2-12B-A2.5B-Instruct profile](/models/mellum2-12b-a2-5b-instruct)
- [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)