Model comparison
Mellum2-12B-A2.5B-Instruct vs Nemotron 3 Nano Omni 30B A3B
Head-to-head evidence from 2 shared benchmark results across 1 category. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Mellum2-12B-A2.5B-Instruct unranked (Not scored); Nemotron 3 Nano Omni 30B A3B #151 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Mellum2-12B-A2.5B-Instruct and Nemotron 3 Nano Omni 30B A3B share 2 comparable benchmark results. 2 of 8 categories are comparable. 3 results are unique to Mellum2-12B-A2.5B-Instruct; 27 to Nemotron 3 Nano Omni 30B A3B.
Updated July 23, 2026- Shared results
- 2
- Mellum2-12B-A2.5B-Instruct only
- 3
- Nemotron 3 Nano Omni 30B A3B only
- 27
- Comparable categories
- 2 / 8
Treat this as a split decision. Mellum2-12B-A2.5B-Instruct makes more sense if instruction following is the priority or you would rather avoid the extra latency and token burn of a reasoning model; Nemotron 3 Nano Omni 30B A3B 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 2 shared benchmark results across 1 evidence category; 2 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-Instruct and Nemotron 3 Nano Omni 30B A3B 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.
Nemotron 3 Nano Omni 30B A3B is the reasoning model in the pair, while Mellum2-12B-A2.5B-Instruct is not. That usually helps on harder chain-of-thought-heavy tests, but it can also mean more latency and more token spend in real use. Nemotron 3 Nano Omni 30B A3B gives you the larger context window at 256K, compared with 128K for Mellum2-12B-A2.5B-Instruct.
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-Instruct | Δ | Nemotron 3 Nano Omni 30B A3B |
|---|---|---|---|
| Knowledge | Mellum2-12B-A2.5B-Instruct40.9 | Margin→ 35.4 | Nemotron 3 Nano Omni 30B A3B76.3 |
| Inst. Following | Mellum2-12B-A2.5B-Instruct75.8 | Margin← 1.6 | Nemotron 3 Nano Omni 30B A3B74.2 |
| Coding | Mellum2-12B-A2.5B-InstructNot measured | MarginNo overlap | Nemotron 3 Nano Omni 30B A3B32.0 |
| Multimodal | Mellum2-12B-A2.5B-InstructNot measured | MarginNo overlap | Nemotron 3 Nano Omni 30B A3B76.3 |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
GPQA
KnowledgeA 40.9%B 72.2%Winner: Nemotron 3 Nano Omni 30B A3BΔ 31.3GPQA: Mellum2-12B-A2.5B-Instruct scored 40.9%; Nemotron 3 Nano Omni 30B A3B scored 72.2%. Nemotron 3 Nano Omni 30B A3B 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-Instruct | Nemotron 3 Nano Omni 30B A3B | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Mellum2-12B-A2.5B-InstructNot available | Nemotron 3 Nano Omni 30B A3B$0 input / $0 output | A complete price comparison is not available. |
| Generation speedtokens per second | Mellum2-12B-A2.5B-InstructNot available | Nemotron 3 Nano Omni 30B A3BNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Mellum2-12B-A2.5B-InstructNot available | Nemotron 3 Nano Omni 30B A3BNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Mellum2-12B-A2.5B-Instruct128K | Nemotron 3 Nano Omni 30B A3B256K | Nemotron 3 Nano Omni 30B A3B lists the larger context window. |
Benchmark Deep Dive
Agentic5 benchmarks
Coding3 benchmarks
Reasoning2 benchmarks
KnowledgeNemotron 3 Nano Omni 30B A3B wins10 benchmarks
| Benchmark | Mellum2-12B-A2.5B-Instruct | Nemotron 3 Nano Omni 30B A3B | Result |
|---|---|---|---|
| MMLU-ReduxSource | 78.1% | — | Not comparable |
| GPQASource | 40.9% | 72.2% | Nemotron 3 Nano Omni 30B A3B leads |
| GPQA-DSource | 40.9% | 72.2% | Nemotron 3 Nano Omni 30B A3B leads |
| MMLU-ProSource | — | 77.3% | Not comparable |
| Artificial Analysis Intelligence IndexSource | — | 14.9% | Not comparable |
| AA-GPQA DiamondSource | — | 46.9% | Not comparable |
| AA-HLESource | — | 5.3% | Not comparable |
| AA-Omniscience IndexSource | — | -56.0% | Not comparable |
| AA-Omniscience AccuracySource | — | 14.8% | Not comparable |
| AA-Omniscience Hallucination RateSource | — | 83.1% | Not comparable |
Math1 benchmarks
| Benchmark | Mellum2-12B-A2.5B-Instruct | Nemotron 3 Nano Omni 30B A3B | Result |
|---|---|---|---|
| AIME 2025Source | — | 82.1% | Not comparable |
Multimodal8 benchmarks
| Benchmark | Mellum2-12B-A2.5B-Instruct | Nemotron 3 Nano Omni 30B A3B | Result |
|---|---|---|---|
| MMMUSource | — | 70.8% | Not comparable |
| MMLongBench-DocSource | — | 57.5% | Not comparable |
| CharXivSource | — | 76.3% | Not comparable |
| ScreenSpot ProSource | — | 57.8% | Not comparable |
| Video-MME (w/o subtitle)Source | — | 72.2% | Not comparable |
| AI2D_TESTSource | — | 88.5% | Not comparable |
| RefCOCO (avg)Source | — | 90.5% | Not comparable |
| AA-MMMU-ProSource | — | 53.2% | Not comparable |
Frequently Asked Questions (3)
Which is better, Mellum2-12B-A2.5B-Instruct or Nemotron 3 Nano Omni 30B A3B?
Mellum2-12B-A2.5B-Instruct and Nemotron 3 Nano Omni 30B A3B 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-Instruct or Nemotron 3 Nano Omni 30B A3B?
Nemotron 3 Nano Omni 30B A3B has the edge for knowledge tasks in this comparison, averaging 76.3 versus 40.9. Inside this category, GPQA is the benchmark that creates the most daylight between them.
Which is better for instruction following, Mellum2-12B-A2.5B-Instruct or Nemotron 3 Nano Omni 30B A3B?
Mellum2-12B-A2.5B-Instruct has the edge for instruction following in this comparison, averaging 75.8 versus 74.2. Nemotron 3 Nano Omni 30B A3B stays close enough that the answer can still flip depending on your workload.
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