# GLM-5.2 vs Mellum2-12B-A2.5B-Thinking

> Side-by-side benchmark comparison for GLM-5.2 and Mellum2-12B-A2.5B-Thinking across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/glm-5-2-vs-mellum2-12b-a2-5b-thinking
- Last updated: September 14, 2026

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

## Quick Verdict

Evidence is too thin for a benchmark verdict: GLM-5.2 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.
- GLM-5.2 has the larger published context window at 1M.

## Model Snapshot

| Property | GLM-5.2 | Mellum2-12B-A2.5B-Thinking |
|----------|----------|----------|
| Creator | Z.AI | JetBrains |
| Type | Open Weight | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 128K |
| Independent public score (not head-to-head) | 68.19 | null |
| Benchmarks Covered | 25 | 6 |
| Pricing (input/output) | $1.40 / $4.40 | N/A |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- GLM-5.2 public-lane score: 58.5 (Supported · #29/153)
- Mellum2-12B-A2.5B-Thinking public-lane score: 46 (Estimated · #80/153)

| Benchmark | GLM-5.2 | Mellum2-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 3.0 | 4.6% | Coming soon | Coming soon |
| Terminal-Bench 2.0 | 81% | Coming soon | Coming soon |
| MCP Atlas | 76.8% | Coming soon | Coming soon |
| Toolathlon | 48.2% | Coming soon | Coming soon |
| ResearchClawBench | 20.7% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 67.8% | Coming soon | Coming soon |
| BFCL v4 | Coming soon | 45.6% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- GLM-5.2 public-lane score: 61 (Supported · #19/152)
- Mellum2-12B-A2.5B-Thinking public-lane score: Coming soon

| Benchmark | GLM-5.2 | Mellum2-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Pro | 62.1% | Coming soon | Coming soon |
| NL2Repo | 48.9% | Coming soon | Coming soon |
| Terminal-Bench 2.0 | 81.0% | Coming soon | Coming soon |
| ProgramBench | 63.7% | Coming soon | Coming soon |
| cursorBench32 | 55.0% | Coming soon | Coming soon |
| OpenHarmony Bench | 58.4% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 69.5% | Coming soon | Coming soon |
| SWE-bench (Vals) | 82.8% | Coming soon | Coming soon |
| LiveCodeBench v6 | Coming soon | 69.9% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- GLM-5.2 public-lane score: 74.8 (Unranked · 2 rankable rows)
- Mellum2-12B-A2.5B-Thinking public-lane score: Coming soon

| Benchmark | GLM-5.2 | Mellum2-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| CritPt | 20.9% | Coming soon | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- GLM-5.2 public-lane score: 60.7 (Supported · #35/183)
- Mellum2-12B-A2.5B-Thinking public-lane score: 46.5 (Estimated · #103/183)

| Benchmark | GLM-5.2 | Mellum2-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 91.2% | 57.6% | GLM-5.2 |
| GPQA-D | 91.2% | 57.6% | GLM-5.2 |
| HLE | 54.7% | Coming soon | Coming soon |
| HLE w/o tools | 40.5% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | 85.6% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 86.7% | Coming soon | Coming soon |
| MMLU-Redux | Coming soon | 86.2% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- GLM-5.2 public-lane score: 89.8 (#22/123)
- Mellum2-12B-A2.5B-Thinking public-lane score: Coming soon

| Benchmark | GLM-5.2 | Mellum2-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| IFEval | Coming soon | 76.5% | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- GLM-5.2 public-lane score: 80.7 (Unranked · 4 rankable rows)
- Mellum2-12B-A2.5B-Thinking public-lane score: Coming soon

| Benchmark | GLM-5.2 | Mellum2-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| AIME26 | 99.2% | Coming soon | Coming soon |
| HMMT Nov 2025 | 94.4% | Coming soon | Coming soon |
| HMMT Feb 2026 | 92.5% | Coming soon | Coming soon |
| MMAnswerBench | 91.0% | Coming soon | Coming soon |

## FAQ

### Is there enough evidence to pick between GLM-5.2 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

- [GLM-5.2 vs GLM-5.3](/compare/glm-5-2-vs-glm-5-3)
- [Mellum2-12B-A2.5B-Thinking vs GLM-5.3](/compare/glm-5-3-vs-mellum2-12b-a2-5b-thinking)
- [GLM-5.2 vs GLM-5.3-Flash](/compare/glm-5-2-vs-glm-5-3-flash)
- [Mellum2-12B-A2.5B-Thinking vs GLM-5.3-Flash](/compare/glm-5-3-flash-vs-mellum2-12b-a2-5b-thinking)

## Explore More

- [GLM-5.2 profile](/models/glm-5-2)
- [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)