# Mellum2.1-12B-A2.5B-Thinking vs Qwen3.5-122B-A10B

> Side-by-side benchmark comparison for Mellum2.1-12B-A2.5B-Thinking and Qwen3.5-122B-A10B across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/mellum2-1-12b-a2-5b-thinking-vs-qwen3-5-122b-a10b
- Last updated: October 8, 2026

- Shared sourced benchmarks: 2
- 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 Qwen3.5-122B-A10B 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.
- Qwen3.5-122B-A10B has the larger published context window at 262K.

## Model Snapshot

| Property | Mellum2.1-12B-A2.5B-Thinking | Qwen3.5-122B-A10B |
|----------|----------|----------|
| Creator | JetBrains | Alibaba |
| Type | Open Weight | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 128K | 262K |
| Independent public score (not head-to-head) | null | 40.57 |
| Benchmarks Covered | 7 | 15 |
| Pricing (input/output) | $0.00 / $0.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon
- Qwen3.5-122B-A10B public-lane score: 23.4 (Estimated · #99/122)

| Benchmark | Mellum2.1-12B-A2.5B-Thinking | Qwen3.5-122B-A10B | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 17.4% | Coming soon | Coming soon |
| Terminal-Bench 2.0 | Coming soon | 49.4% | Coming soon |
| BrowseComp | Coming soon | 63.8% | Coming soon |
| OSWorld-Verified | Coming soon | 58% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon
- Qwen3.5-122B-A10B public-lane score: 33.8 (Supported · #82/146)

| Benchmark | Mellum2.1-12B-A2.5B-Thinking | Qwen3.5-122B-A10B | Winner |
|-----------|-----------|-----------|--------|
| LiveCodeBench v6 | 82.0% | Coming soon | Coming soon |
| SWE-bench Verified | 47% | 72% | Qwen3.5-122B-A10B |
| SWE-bench Pro | 28% | Coming soon | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon
- Qwen3.5-122B-A10B public-lane score: 49.9 (Unranked · 3 rankable rows)

| Benchmark | Mellum2.1-12B-A2.5B-Thinking | Qwen3.5-122B-A10B | Winner |
|-----------|-----------|-----------|--------|
| LongBench v2 | Coming soon | 60.2% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon
- Qwen3.5-122B-A10B public-lane score: 58 (#33/49)

| Benchmark | Mellum2.1-12B-A2.5B-Thinking | Qwen3.5-122B-A10B | Winner |
|-----------|-----------|-----------|--------|
| MMMU | Coming soon | 83.9% | Coming soon |
| MMVU | Coming soon | 74.7% | Coming soon |
| MathVision | Coming soon | 86.2% | Coming soon |
| CharXiv | Coming soon | 77.2% | Coming soon |
| V* | Coming soon | 93.2% | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon
- Qwen3.5-122B-A10B public-lane score: 42.6 (Supported · #95/174)

| Benchmark | Mellum2.1-12B-A2.5B-Thinking | Qwen3.5-122B-A10B | Winner |
|-----------|-----------|-----------|--------|
| MMLU-Redux | 87.8% | Coming soon | Coming soon |
| GPQA-D | 64.6% | Coming soon | Coming soon |
| MMLU-Pro | Coming soon | 86.7% | Coming soon |
| SuperGPQA | Coming soon | 67.1% | Coming soon |
| GPQA | Coming soon | 86.6% | Coming soon |

### Multilingual

- Winner: Insufficient shared evidence
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon
- Qwen3.5-122B-A10B public-lane score: 87.1 (#9/16)

| Benchmark | Mellum2.1-12B-A2.5B-Thinking | Qwen3.5-122B-A10B | Winner |
|-----------|-----------|-----------|--------|
| MMLU-ProX | Coming soon | 82.2% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon
- Qwen3.5-122B-A10B public-lane score: 91.6 (#11/125)

| Benchmark | Mellum2.1-12B-A2.5B-Thinking | Qwen3.5-122B-A10B | Winner |
|-----------|-----------|-----------|--------|
| IFEval | 90.6% | 93.4% | Qwen3.5-122B-A10B |

## FAQ

### Is there enough evidence to pick between Mellum2.1-12B-A2.5B-Thinking and Qwen3.5-122B-A10B?

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

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- [Qwen3.5-122B-A10B vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-qwen3-5-122b-a10b)
- [Mellum2.1-12B-A2.5B-Thinking vs GPT-6 Astra](/compare/gpt-6-astra-vs-mellum2-1-12b-a2-5b-thinking)
- [Qwen3.5-122B-A10B vs GPT-6 Astra](/compare/gpt-6-astra-vs-qwen3-5-122b-a10b)

## Explore More

- [Mellum2.1-12B-A2.5B-Thinking profile](/models/mellum2-1-12b-a2-5b-thinking)
- [Qwen3.5-122B-A10B profile](/models/qwen3-5-122b-a10b)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)