# Mellum2.1-12B-A2.5B-Thinking vs MiMo-V2.6-Flash

> Side-by-side benchmark comparison for Mellum2.1-12B-A2.5B-Thinking and MiMo-V2.6-Flash across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/mellum2-1-12b-a2-5b-thinking-vs-mimo-v2-6-flash
- Last updated: October 8, 2026

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

## Quick Verdict

Evidence is too thin for a benchmark verdict: Mellum2.1-12B-A2.5B-Thinking and MiMo-V2.6-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.
- Mellum2.1-12B-A2.5B-Thinking has the lower published output-token price.
- MiMo-V2.6-Flash has the larger published context window at 1M.

## Model Snapshot

| Property | Mellum2.1-12B-A2.5B-Thinking | MiMo-V2.6-Flash |
|----------|----------|----------|
| Creator | JetBrains | Xiaomi |
| Type | Open Weight | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 128K | 1M |
| Independent public score (not head-to-head) | null | 65.91 |
| Benchmarks Covered | 7 | 12 |
| Pricing (input/output) | $0.00 / $0.00 | $0.14 / $0.28 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon
- MiMo-V2.6-Flash public-lane score: 55.2 (Estimated · #37/122)

| Benchmark | Mellum2.1-12B-A2.5B-Thinking | MiMo-V2.6-Flash | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 17.4% | 87.6% | MiMo-V2.6-Flash |
| Toolathlon-Verified | Coming soon | 73.6% | Coming soon |
| AutomationBench | Coming soon | 52.3% | Coming soon |
| Agents' Last Exam | Coming soon | 27.6% | Coming soon |
| Terminal-Bench 4.0 | Coming soon | 28.80% | Coming soon |
| OSWorld-Verified | Coming soon | 80.8% | Coming soon |
| JobBench | Coming soon | 61.2% | Coming soon |
| CyberGym | Coming soon | 95.1% | Coming soon |
| ExploitGym | Coming soon | 6.0% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon
- MiMo-V2.6-Flash public-lane score: 61.4 (Supported · #17/146)

| Benchmark | Mellum2.1-12B-A2.5B-Thinking | MiMo-V2.6-Flash | Winner |
|-----------|-----------|-----------|--------|
| LiveCodeBench v6 | 82.0% | Coming soon | Coming soon |
| SWE-bench Verified | 47% | Coming soon | Coming soon |
| SWE-bench Pro | 28% | Coming soon | Coming soon |
| DeepSWE | Coming soon | 67.9% | Coming soon |
| ProgramBench | Coming soon | 26.0% | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 87.6% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon
- MiMo-V2.6-Flash public-lane score: 73.4 (Unranked · 2 rankable rows)

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon
- MiMo-V2.6-Flash public-lane score: 68.8 (Unranked · 1 rankable row)

### Knowledge

- Winner: Insufficient shared evidence
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon
- MiMo-V2.6-Flash public-lane score: 60.7 (Estimated · #40/174)

| Benchmark | Mellum2.1-12B-A2.5B-Thinking | MiMo-V2.6-Flash | Winner |
|-----------|-----------|-----------|--------|
| MMLU-Redux | 87.8% | Coming soon | Coming soon |
| GPQA-D | 64.6% | Coming soon | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon
- MiMo-V2.6-Flash public-lane score: Coming soon

| Benchmark | Mellum2.1-12B-A2.5B-Thinking | MiMo-V2.6-Flash | Winner |
|-----------|-----------|-----------|--------|
| IFEval | 90.6% | Coming soon | Coming soon |

## FAQ

### Is there enough evidence to pick between Mellum2.1-12B-A2.5B-Thinking and MiMo-V2.6-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

- [Mellum2.1-12B-A2.5B-Thinking vs MiMo-V2.6-Pro](/compare/mellum2-1-12b-a2-5b-thinking-vs-mimo-v2-6-pro)
- [MiMo-V2.6-Flash vs MiMo-V2.6-Pro](/compare/mimo-v2-6-flash-vs-mimo-v2-6-pro)
- [Mellum2.1-12B-A2.5B-Thinking vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-mellum2-1-12b-a2-5b-thinking)
- [MiMo-V2.6-Flash vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-mimo-v2-6-flash)

## Explore More

- [Mellum2.1-12B-A2.5B-Thinking profile](/models/mellum2-1-12b-a2-5b-thinking)
- [MiMo-V2.6-Flash profile](/models/mimo-v2-6-flash)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)