# Kimi K2.5 (Reasoning) vs Mellum2-12B-A2.5B-Instruct

> Side-by-side benchmark comparison for Kimi K2.5 (Reasoning) and Mellum2-12B-A2.5B-Instruct across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/kimi-k2-5-reasoning-vs-mellum2-12b-a2-5b-instruct
- Last updated: September 4, 2026

- Shared sourced benchmarks: 1
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Evidence is too thin for a benchmark verdict: Kimi K2.5 (Reasoning) and Mellum2-12B-A2.5B-Instruct 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 | Kimi K2.5 (Reasoning) | Mellum2-12B-A2.5B-Instruct |
|----------|----------|----------|
| Creator | Moonshot AI | JetBrains |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Non-Reasoning |
| Context | 128K | 128K |
| Independent public score (not head-to-head) | 58.74 | null |
| Benchmarks Covered | 9 | 6 |
| Pricing (input/output) | $0.60 / $3.00 | N/A |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Kimi K2.5 (Reasoning) public-lane score: 49.9 (Estimated · #67/151)
- Mellum2-12B-A2.5B-Instruct public-lane score: 47.8 (Estimated · #82/151)

| Benchmark | Kimi K2.5 (Reasoning) | Mellum2-12B-A2.5B-Instruct | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 50.8% | Coming soon | Coming soon |
| BrowseComp | 60.6% | Coming soon | Coming soon |
| Gert Labs | 32.58% | Coming soon | Coming soon |
| BFCL v4 | Coming soon | 44.2% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Kimi K2.5 (Reasoning) public-lane score: 52.9 (Estimated · #52/183)
- Mellum2-12B-A2.5B-Instruct public-lane score: Coming soon

| Benchmark | Kimi K2.5 (Reasoning) | Mellum2-12B-A2.5B-Instruct | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 76.8% | Coming soon | Coming soon |
| Vibe Code Bench | 17.54% | Coming soon | Coming soon |
| LiveCodeBench v6 | Coming soon | 37.2% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Kimi K2.5 (Reasoning) public-lane score: 63.2 (Unranked · 1 rankable row)
- Mellum2-12B-A2.5B-Instruct public-lane score: Coming soon

| Benchmark | Kimi K2.5 (Reasoning) | Mellum2-12B-A2.5B-Instruct | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 78.5% | Coming soon | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Kimi K2.5 (Reasoning) public-lane score: 52.4 (Estimated · #78/181)
- Mellum2-12B-A2.5B-Instruct public-lane score: 48.1 (Estimated · #103/181)

| Benchmark | Kimi K2.5 (Reasoning) | Mellum2-12B-A2.5B-Instruct | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 87.6% | 40.9% | Kimi K2.5 (Reasoning) |
| MMLU-Pro | 87.1% | Coming soon | Coming soon |
| MMLU-Redux | Coming soon | 78.1% | Coming soon |
| GPQA-D | Coming soon | 40.9% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Kimi K2.5 (Reasoning) public-lane score: Coming soon
- Mellum2-12B-A2.5B-Instruct public-lane score: Coming soon

| Benchmark | Kimi K2.5 (Reasoning) | Mellum2-12B-A2.5B-Instruct | Winner |
|-----------|-----------|-----------|--------|
| IFEval | Coming soon | 75.8% | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- Kimi K2.5 (Reasoning) public-lane score: Coming soon
- Mellum2-12B-A2.5B-Instruct public-lane score: Coming soon

| Benchmark | Kimi K2.5 (Reasoning) | Mellum2-12B-A2.5B-Instruct | Winner |
|-----------|-----------|-----------|--------|
| AIME 2025 | 96.1% | Coming soon | Coming soon |

## FAQ

### Is there enough evidence to pick between Kimi K2.5 (Reasoning) and Mellum2-12B-A2.5B-Instruct?

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

- [Kimi K2.5 (Reasoning) vs Kimi K2.5](/compare/kimi-k2-5-vs-kimi-k2-5-reasoning)
- [Mellum2-12B-A2.5B-Instruct vs Kimi K2.5](/compare/kimi-k2-5-vs-mellum2-12b-a2-5b-instruct)
- [Kimi K2.5 (Reasoning) vs Mellum2-12B-A2.5B-Thinking](/compare/kimi-k2-5-reasoning-vs-mellum2-12b-a2-5b-thinking)
- [Mellum2-12B-A2.5B-Instruct vs Mellum2-12B-A2.5B-Thinking](/compare/mellum2-12b-a2-5b-instruct-vs-mellum2-12b-a2-5b-thinking)

## Explore More

- [Kimi K2.5 (Reasoning) profile](/models/kimi-k2-5-reasoning)
- [Mellum2-12B-A2.5B-Instruct profile](/models/mellum2-12b-a2-5b-instruct)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)