# Laguna XS.2 vs Mellum2.1-12B-A2.5B-Thinking

> Side-by-side benchmark comparison for Laguna XS.2 and Mellum2.1-12B-A2.5B-Thinking across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/laguna-xs-2-vs-mellum2-1-12b-a2-5b-thinking
- Last updated: October 8, 2026

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

## Quick Verdict

Evidence is too thin for a benchmark verdict: Laguna XS.2 and Mellum2.1-12B-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.
- Laguna XS.2 has the larger published context window at 256K.

## Model Snapshot

| Property | Laguna XS.2 | Mellum2.1-12B-A2.5B-Thinking |
|----------|----------|----------|
| Creator | Poolside | JetBrains |
| Type | Open Weight | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 256K | 128K |
| Independent public score (not head-to-head) | null | null |
| Benchmarks Covered | 10 | 7 |
| Pricing (input/output) | $0.00 / $0.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Laguna XS.2 public-lane score: Coming soon
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon

| Benchmark | Laguna XS.2 | Mellum2.1-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 35.7% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 25.8% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 17.4% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Laguna XS.2 public-lane score: 22.5 (Supported · #113/146)
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon

| Benchmark | Laguna XS.2 | Mellum2.1-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 69.9% | 47% | Laguna XS.2 |
| SWE Multilingual | 57.7% | Coming soon | Coming soon |
| SWE-bench Pro | 46.3% | 28% | Laguna XS.2 |
| Terminal-Bench 2.0 | 35.7% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 67.8% | Coming soon | Coming soon |
| SWE-bench (Vals) | 55.2% | Coming soon | Coming soon |
| LiveCodeBench v6 | Coming soon | 82.0% | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Laguna XS.2 public-lane score: Coming soon
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon

| Benchmark | Laguna XS.2 | Mellum2.1-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| GPQA Diamond (Vals) | 55.1% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 69.1% | Coming soon | Coming soon |
| MMLU-Redux | Coming soon | 87.8% | Coming soon |
| GPQA-D | Coming soon | 64.6% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Laguna XS.2 public-lane score: Coming soon
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon

| Benchmark | Laguna XS.2 | Mellum2.1-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| IFEval | Coming soon | 90.6% | Coming soon |

## FAQ

### Is there enough evidence to pick between Laguna XS.2 and Mellum2.1-12B-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

- [Laguna XS.2 vs Laguna S 2.1](/compare/laguna-s-2-1-vs-laguna-xs-2)
- [Mellum2.1-12B-A2.5B-Thinking vs Laguna S 2.1](/compare/laguna-s-2-1-vs-mellum2-1-12b-a2-5b-thinking)
- [Laguna XS.2 vs Laguna M.1](/compare/laguna-m-1-vs-laguna-xs-2)
- [Mellum2.1-12B-A2.5B-Thinking vs Laguna M.1](/compare/laguna-m-1-vs-mellum2-1-12b-a2-5b-thinking)

## Explore More

- [Laguna XS.2 profile](/models/laguna-xs-2)
- [Mellum2.1-12B-A2.5B-Thinking profile](/models/mellum2-1-12b-a2-5b-thinking)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)