# Gemini 2.5 Pro vs Mellum2-12B-A2.5B-Thinking

> Side-by-side benchmark comparison for Gemini 2.5 Pro and Mellum2-12B-A2.5B-Thinking across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gemini-2-5-pro-vs-mellum2-12b-a2-5b-thinking
- 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: Gemini 2.5 Pro and Mellum2-12B-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.
- Gemini 2.5 Pro has the larger published context window at 1M.

## Model Snapshot

| Property | Gemini 2.5 Pro | Mellum2-12B-A2.5B-Thinking |
|----------|----------|----------|
| Creator | Google | JetBrains |
| Type | Proprietary | Open Weight |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 1M | 128K |
| Independent public score (not head-to-head) | 57.98 | null |
| Benchmarks Covered | 7 | 6 |
| Pricing (input/output) | $1.25 / $10.00 | N/A |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Gemini 2.5 Pro public-lane score: 49.3 (Estimated · #70/151)
- Mellum2-12B-A2.5B-Thinking public-lane score: 48.3 (Estimated · #76/151)

| Benchmark | Gemini 2.5 Pro | Mellum2-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| Gert Labs | 42.01% | Coming soon | Coming soon |
| BFCL v4 | Coming soon | 45.6% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Gemini 2.5 Pro public-lane score: 32 (Supported · #165/183)
- Mellum2-12B-A2.5B-Thinking public-lane score: Coming soon

| Benchmark | Gemini 2.5 Pro | Mellum2-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 63.8% | Coming soon | Coming soon |
| Vibe Code Bench | 0.40% | Coming soon | Coming soon |
| LiveCodeBench v6 | Coming soon | 69.9% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Gemini 2.5 Pro public-lane score: 70.3 (Unranked · 1 rankable row)
- Mellum2-12B-A2.5B-Thinking public-lane score: Coming soon

### Reasoning

- Winner: Insufficient shared evidence
- Gemini 2.5 Pro public-lane score: 68.5 (Unranked · 2 rankable rows)
- Mellum2-12B-A2.5B-Thinking public-lane score: Coming soon

### Knowledge

- Winner: Insufficient shared evidence
- Gemini 2.5 Pro public-lane score: 51.1 (Supported · #84/181)
- Mellum2-12B-A2.5B-Thinking public-lane score: 48.8 (Estimated · #96/181)

| Benchmark | Gemini 2.5 Pro | Mellum2-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 83% | 57.6% | Gemini 2.5 Pro |
| HLE | 18.8% | Coming soon | Coming soon |
| MMLU-Redux | Coming soon | 86.2% | Coming soon |
| GPQA-D | Coming soon | 57.6% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Gemini 2.5 Pro public-lane score: 57.7 (#72/120)
- Mellum2-12B-A2.5B-Thinking public-lane score: Coming soon

| Benchmark | Gemini 2.5 Pro | Mellum2-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| IFEval | Coming soon | 76.5% | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- Gemini 2.5 Pro public-lane score: 35.2 (Unranked · 2 rankable rows)
- Mellum2-12B-A2.5B-Thinking public-lane score: Coming soon

| Benchmark | Gemini 2.5 Pro | Mellum2-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 14.138% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 4.167% | Coming soon | Coming soon |

## FAQ

### Is there enough evidence to pick between Gemini 2.5 Pro and Mellum2-12B-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

- [Gemini 2.5 Pro vs Mellum2-12B-A2.5B-Instruct](/compare/gemini-2-5-pro-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)
- [Gemini 2.5 Pro vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-gemini-2-5-pro)
- [Mellum2-12B-A2.5B-Thinking vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-mellum2-12b-a2-5b-thinking)

## Explore More

- [Gemini 2.5 Pro profile](/models/gemini-2-5-pro)
- [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)