# Inkling vs Mellum2-12B-A2.5B-Thinking

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

- Canonical page: https://benchlm.ai/compare/inkling-vs-mellum2-12b-a2-5b-thinking
- Last updated: October 14, 2026

- Shared sourced benchmarks: 2
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Evidence is too thin for a benchmark verdict: Inkling and Mellum2-12B-A2.5B-Thinking 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.
- Inkling has the larger published context window at 1M.

## Model Snapshot

| Property | Inkling | Mellum2-12B-A2.5B-Thinking |
|----------|----------|----------|
| Creator | Thinking Machines Lab | JetBrains |
| Type | Open Weight | Open Weight |
| Reasoning | Hybrid | Reasoning |
| Context | 1M | 128K |
| Independent public score (not head-to-head) | 52.13 | null |
| Benchmarks Covered | 24 | 6 |
| Pricing (input/output) | $1.87 / $4.68 | N/A |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Inkling public-lane score: 36.2 (Supported · #72/124)
- Mellum2-12B-A2.5B-Thinking public-lane score: Coming soon

| Benchmark | Inkling | Mellum2-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 63.8% | Coming soon | Coming soon |
| BrowseComp | 77.1% | Coming soon | Coming soon |
| MCP Atlas | 74.1% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 47.6% | Coming soon | Coming soon |
| CWE-bench v1 | 37.0% | Coming soon | Coming soon |
| BFCL v4 | Coming soon | 45.6% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Inkling public-lane score: 34 (Supported · #80/149)
- Mellum2-12B-A2.5B-Thinking public-lane score: Coming soon

| Benchmark | Inkling | Mellum2-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 77.6% | Coming soon | Coming soon |
| SWE-bench Pro | 54.3% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 63.8% | Coming soon | Coming soon |
| FrontierSWE v2 | 4.1% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 85.5% | Coming soon | Coming soon |
| SWE-bench (Vals) | 77.6% | Coming soon | Coming soon |
| LiveCodeBench v6 | Coming soon | 69.9% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Inkling public-lane score: 79 (#14/29)
- Mellum2-12B-A2.5B-Thinking public-lane score: Coming soon

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Inkling public-lane score: 67.5 (#35/54)
- Mellum2-12B-A2.5B-Thinking public-lane score: Coming soon

| Benchmark | Inkling | Mellum2-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 73.5% | Coming soon | Coming soon |
| CharXiv | 82% | Coming soon | Coming soon |
| CharXiv w/o tools | 78.1% | Coming soon | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Inkling public-lane score: 54.5 (Supported · #62/181)
- Mellum2-12B-A2.5B-Thinking public-lane score: Coming soon

| Benchmark | Inkling | Mellum2-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 87.9% | 57.6% | Inkling |
| GPQA-D | 87.9% | 57.6% | Inkling |
| HLE | 46% | Coming soon | Coming soon |
| HLE w/o tools | 30% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | 87.1% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 86.3% | Coming soon | Coming soon |
| MMLU-Redux | Coming soon | 86.2% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Inkling public-lane score: 87.6 (#35/128)
- Mellum2-12B-A2.5B-Thinking public-lane score: Coming soon

| Benchmark | Inkling | Mellum2-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| IFBench | 79.8% | Coming soon | Coming soon |
| IFEval | Coming soon | 76.5% | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- Inkling public-lane score: 58.3 (#11/12)
- Mellum2-12B-A2.5B-Thinking public-lane score: Coming soon

| Benchmark | Inkling | Mellum2-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| AIME26 | 97.1% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 33.333% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 4.878% | Coming soon | Coming soon |

## FAQ

### Is there enough evidence to pick between Inkling and Mellum2-12B-A2.5B-Thinking?

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

- [Inkling vs Inkling-Small](/compare/inkling-vs-inkling-small)
- [Mellum2-12B-A2.5B-Thinking vs Inkling-Small](/compare/inkling-small-vs-mellum2-12b-a2-5b-thinking)
- [Inkling vs Mellum2-12B-A2.5B-Instruct](/compare/inkling-vs-mellum2-12b-a2-5b-instruct)
- [Mellum2-12B-A2.5B-Thinking vs Mellum2-12B-A2.5B-Instruct](/compare/mellum2-12b-a2-5b-instruct-vs-mellum2-12b-a2-5b-thinking)

## Explore More

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