# Granite 4.2 3B vs Mellum2.1-12B-A2.5B-Thinking

> Side-by-side benchmark comparison for Granite 4.2 3B and Mellum2.1-12B-A2.5B-Thinking across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/granite-4-2-3b-vs-mellum2-1-12b-a2-5b-thinking
- 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: Granite 4.2 3B and Mellum2.1-12B-A2.5B-Thinking 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.

## Model Snapshot

| Property | Granite 4.2 3B | Mellum2.1-12B-A2.5B-Thinking |
|----------|----------|----------|
| Creator | IBM | JetBrains |
| Type | Open Weight | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 128K | 128K |
| Independent public score (not head-to-head) | null | null |
| Benchmarks Covered | 9 | 7 |
| Pricing (input/output) | $0.00 / $0.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Granite 4.2 3B public-lane score: Coming soon
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon

| Benchmark | Granite 4.2 3B | Mellum2.1-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| τ³-bench results | 45.8% | Coming soon | Coming soon |
| BFCL v4 | 52.4% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 17.4% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Granite 4.2 3B public-lane score: Coming soon
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon

| Benchmark | Granite 4.2 3B | Mellum2.1-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| LiveCodeBench v6 | 69.7% | 82.0% | Mellum2.1-12B-A2.5B-Thinking |
| SciCode | 24.1% | Coming soon | Coming soon |
| SWE-bench Verified | Coming soon | 47% | Coming soon |
| SWE-bench Pro | Coming soon | 28% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Granite 4.2 3B public-lane score: 38.9 (Unranked · 2 rankable rows)
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon

### Knowledge

- Winner: Insufficient shared evidence
- Granite 4.2 3B public-lane score: Coming soon
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon

| Benchmark | Granite 4.2 3B | Mellum2.1-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 54.8% | Coming soon | Coming soon |
| MMLU-Pro | 67.8% | Coming soon | Coming soon |
| MMLU-Redux | Coming soon | 87.8% | Coming soon |
| GPQA-D | Coming soon | 64.6% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Granite 4.2 3B public-lane score: Coming soon
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon

| Benchmark | Granite 4.2 3B | Mellum2.1-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| IFBench | 74.3% | Coming soon | Coming soon |
| IFEval | Coming soon | 90.6% | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- Granite 4.2 3B public-lane score: Coming soon
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon

| Benchmark | Granite 4.2 3B | Mellum2.1-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| AIME 2025 | 78.3% | Coming soon | Coming soon |
| HMMT Feb 2025 | 66.7% | Coming soon | Coming soon |

## FAQ

### Is there enough evidence to pick between Granite 4.2 3B and Mellum2.1-12B-A2.5B-Thinking?

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

- [Granite 4.2 3B vs Granite 4.2 8B](/compare/granite-4-2-3b-vs-granite-4-2-8b)
- [Mellum2.1-12B-A2.5B-Thinking vs Granite 4.2 8B](/compare/granite-4-2-8b-vs-mellum2-1-12b-a2-5b-thinking)
- [Granite 4.2 3B vs Granite 4.2 30B](/compare/granite-4-2-30b-vs-granite-4-2-3b)
- [Mellum2.1-12B-A2.5B-Thinking vs Granite 4.2 30B](/compare/granite-4-2-30b-vs-mellum2-1-12b-a2-5b-thinking)

## Explore More

- [Granite 4.2 3B profile](/models/granite-4-2-3b)
- [Mellum2.1-12B-A2.5B-Thinking profile](/models/mellum2-1-12b-a2-5b-thinking)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)