Model comparison
Mellum2-12B-A2.5B-Thinking vs MiMo-V2-Flash
Head-to-head evidence from 1 shared benchmark result across 1 category. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Mellum2-12B-A2.5B-Thinking unranked (Not scored); MiMo-V2-Flash #91 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Mellum2-12B-A2.5B-Thinking and MiMo-V2-Flash share 1 comparable benchmark result. 1 of 8 categories are comparable. 4 results are unique to Mellum2-12B-A2.5B-Thinking; 18 to MiMo-V2-Flash.
Updated July 23, 2026- Shared results
- 1
- Mellum2-12B-A2.5B-Thinking only
- 4
- MiMo-V2-Flash only
- 18
- Comparable categories
- 1 / 8
Treat this as a split decision. Mellum2-12B-A2.5B-Thinking makes more sense if its workflow fits your team better; MiMo-V2-Flash is the better fit if knowledge is the priority or you need the larger 256K context window.
Confidence note. This is a partial-evidence comparison with 1 shared benchmark result across 1 evidence category; 1 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
Mellum2-12B-A2.5B-Thinking and MiMo-V2-Flash finish on the same BenchAlign overall score, so this is less about a single winner and more about where the edge shows up. The BenchAlign headline says tie; the benchmark table is where the real choice happens.
MiMo-V2-Flash gives you the larger context window at 256K, compared with 128K for Mellum2-12B-A2.5B-Thinking.
Category breakdown
Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.
| Category | Mellum2-12B-A2.5B-Thinking | Δ | MiMo-V2-Flash |
|---|---|---|---|
| Knowledge | Mellum2-12B-A2.5B-Thinking57.6 | Margin→ 27.1 | MiMo-V2-Flash84.7 |
| Coding | Mellum2-12B-A2.5B-ThinkingNot measured | MarginNo overlap | MiMo-V2-Flash73.4 |
| Inst. Following | Mellum2-12B-A2.5B-Thinking76.5 | MarginNo overlap | MiMo-V2-FlashNot measured |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
GPQA
KnowledgeA 57.6%B 83.7%Winner: MiMo-V2-FlashΔ 26.1GPQA: Mellum2-12B-A2.5B-Thinking scored 57.6%; MiMo-V2-Flash scored 83.7%. MiMo-V2-Flash wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Mellum2-12B-A2.5B-Thinking | MiMo-V2-Flash | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Mellum2-12B-A2.5B-ThinkingNot available | MiMo-V2-Flash$0 input / $0 output | A complete price comparison is not available. |
| Generation speedtokens per second | Mellum2-12B-A2.5B-ThinkingNot available | MiMo-V2-Flash129 tok/s | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Mellum2-12B-A2.5B-ThinkingNot available | MiMo-V2-Flash2.14 s | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Mellum2-12B-A2.5B-Thinking128K | MiMo-V2-Flash256K | MiMo-V2-Flash lists the larger context window. |
Benchmark Deep Dive
Agentic5 benchmarks
Coding3 benchmarks
Reasoning2 benchmarks
KnowledgeMiMo-V2-Flash wins10 benchmarks
| Benchmark | Mellum2-12B-A2.5B-Thinking | MiMo-V2-Flash | Result |
|---|---|---|---|
| MMLU-ReduxSource | 86.2% | — | Not comparable |
| GPQASource | 57.6% | 83.7% | MiMo-V2-Flash leads |
| GPQA-DSource | 57.6% | — | Not comparable |
| MMLU-ProSource | — | 84.9% | Not comparable |
| Artificial Analysis Intelligence IndexSource | — | 24.7% | Not comparable |
| AA-GPQA DiamondSource | — | 65.6% | Not comparable |
| AA-HLESource | — | 8.0% | Not comparable |
| AA-Omniscience IndexSource | — | -48.5% | Not comparable |
| AA-Omniscience AccuracySource | — | 15.2% | Not comparable |
| AA-Omniscience Hallucination RateSource | — | 75.1% | Not comparable |
Math1 benchmarks
| Benchmark | Mellum2-12B-A2.5B-Thinking | MiMo-V2-Flash | Result |
|---|---|---|---|
| AIME 2025Source | — | 94.1% | Not comparable |
Frequently Asked Questions (2)
Which is better, Mellum2-12B-A2.5B-Thinking or MiMo-V2-Flash?
Mellum2-12B-A2.5B-Thinking and MiMo-V2-Flash are tied on the BenchAlign overall score, so the right pick depends on which category matters most for your use case.
Which is better for knowledge tasks, Mellum2-12B-A2.5B-Thinking or MiMo-V2-Flash?
MiMo-V2-Flash has the edge for knowledge tasks in this comparison, averaging 84.7 versus 57.6. Inside this category, GPQA is the benchmark that creates the most daylight between them.
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