# Gemma 4 12B vs Mercury 2.5

> Side-by-side benchmark comparison for Gemma 4 12B and Mercury 2.5 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gemma-4-12b-vs-mercury-2-5
- Last updated: September 8, 2026

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

## Quick Verdict

Evidence is too thin for a benchmark verdict: Gemma 4 12B and Mercury 2.5 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.
- Mercury 2.5 has the larger published context window at 260K.

## Model Snapshot

| Property | Gemma 4 12B | Mercury 2.5 |
|----------|----------|----------|
| Creator | Google | Inception |
| Type | Open Weight | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 256K | 260K |
| Independent public score (not head-to-head) | 43.23 | null |
| Benchmarks Covered | 12 | 5 |
| Pricing (input/output) | N/A | $0.04 / $0.15 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Gemma 4 12B public-lane score: 45.5 (Estimated · #85/152)
- Mercury 2.5 public-lane score: 44.5 (Estimated · #91/152)

| Benchmark | Gemma 4 12B | Mercury 2.5 | Winner |
|-----------|-----------|-----------|--------|
| τ³-bench results | Coming soon | 96.0% | Coming soon |
| DeepSearchQA | Coming soon | 34.0% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Gemma 4 12B public-lane score: 44.6 (Estimated · #94/151)
- Mercury 2.5 public-lane score: 47.8 (Estimated · #73/151)

| Benchmark | Gemma 4 12B | Mercury 2.5 | Winner |
|-----------|-----------|-----------|--------|
| LiveCodeBench v6 | 72.0% | Coming soon | Coming soon |
| SciCode | Coming soon | 38% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Gemma 4 12B public-lane score: 26.1 (#44/48)
- Mercury 2.5 public-lane score: Coming soon

| Benchmark | Gemma 4 12B | Mercury 2.5 | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 69.1% | Coming soon | Coming soon |
| MathVision | 79.7% | Coming soon | Coming soon |
| MedXpertQA (MM) | 48.7% | Coming soon | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Gemma 4 12B public-lane score: 33.7 (Unranked · 4 rankable rows)
- Mercury 2.5 public-lane score: 67.7 (Unranked · 1 rankable row)

| Benchmark | Gemma 4 12B | Mercury 2.5 | Winner |
|-----------|-----------|-----------|--------|
| BBH | 53% | Coming soon | Coming soon |
| MRCRv2 | 43.4% | Coming soon | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Gemma 4 12B public-lane score: 39.2 (Supported · #140/182)
- Mercury 2.5 public-lane score: 48.3 (Estimated · #94/182)

| Benchmark | Gemma 4 12B | Mercury 2.5 | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 78.8% | Coming soon | Coming soon |
| GPQA-D | 78.8% | 79.0% | Mercury 2.5 |
| MMLU-Pro | 77.2% | Coming soon | Coming soon |
| HLE w/o tools | 5.2% | Coming soon | Coming soon |
| MMMLU | 83.4% | Coming soon | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Gemma 4 12B public-lane score: 90.1 (#21/121)
- Mercury 2.5 public-lane score: 80.1 (#53/121)

| Benchmark | Gemma 4 12B | Mercury 2.5 | Winner |
|-----------|-----------|-----------|--------|
| IFBench | Coming soon | 77% | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- Gemma 4 12B public-lane score: 57.6 (Unranked · 1 rankable row)
- Mercury 2.5 public-lane score: Coming soon

| Benchmark | Gemma 4 12B | Mercury 2.5 | Winner |
|-----------|-----------|-----------|--------|
| AIME26 | 77.5% | Coming soon | Coming soon |

## FAQ

### Is there enough evidence to pick between Gemma 4 12B and Mercury 2.5?

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

- [Gemma 4 12B vs Gemma 4 26B A4B](/compare/gemma-4-12b-vs-gemma-4-26b-a4b)
- [Mercury 2.5 vs Gemma 4 26B A4B](/compare/gemma-4-26b-a4b-vs-mercury-2-5)
- [Gemma 4 12B vs Gemma 4 31B](/compare/gemma-4-12b-vs-gemma-4-31b)
- [Mercury 2.5 vs Gemma 4 31B](/compare/gemma-4-31b-vs-mercury-2-5)

## Explore More

- [Gemma 4 12B profile](/models/gemma-4-12b)
- [Mercury 2.5 profile](/models/mercury-2-5)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)