# Apodex 1.1 vs Mellum2.1-12B-A2.5B-Thinking

> Side-by-side benchmark comparison for Apodex 1.1 and Mellum2.1-12B-A2.5B-Thinking across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/apodex-1-1-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: Apodex 1.1 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.
- Mellum2.1-12B-A2.5B-Thinking has the lower published output-token price.
- Mellum2.1-12B-A2.5B-Thinking has the larger published context window at 128K.

## Model Snapshot

| Property | Apodex 1.1 | Mellum2.1-12B-A2.5B-Thinking |
|----------|----------|----------|
| Creator | Apodex | JetBrains |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | N/A | 128K |
| Independent public score (not head-to-head) | 50.64 | null |
| Benchmarks Covered | 10 | 7 |
| Pricing (input/output) | Pricing unavailable / Pricing unavailable | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Apodex 1.1 public-lane score: 45.4 (Estimated · #52/122)
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon

| Benchmark | Apodex 1.1 | Mellum2.1-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 70.8% | 17.4% | Apodex 1.1 |
| HLE w/ tools | 56.1% | Coming soon | Coming soon |
| APEX-Agents | 38.5% | Coming soon | Coming soon |
| DeepSearchQA | 92.4% | Coming soon | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Apodex 1.1 public-lane score: 42.7 (Estimated · #59/146)
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon

| Benchmark | Apodex 1.1 | Mellum2.1-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 70.8% | Coming soon | Coming soon |
| SWE-bench Verified | 77.7% | 47% | Apodex 1.1 |
| LiveCodeBench v6 | Coming soon | 82.0% | Coming soon |
| SWE-bench Pro | Coming soon | 28% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Apodex 1.1 public-lane score: 76.8 (Unranked · 2 rankable rows)
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Apodex 1.1 public-lane score: 77.7 (Unranked · 1 rankable row)
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon

### Knowledge

- Winner: Insufficient shared evidence
- Apodex 1.1 public-lane score: 53.5 (Supported · #59/174)
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon

| Benchmark | Apodex 1.1 | Mellum2.1-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| HLE | 56.1% | Coming soon | Coming soon |
| FrontierScience Research | 63.3% | Coming soon | Coming soon |
| BioMysteryBench (human-difficult) | 35.3% | 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
- Apodex 1.1 public-lane score: Coming soon
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon

| Benchmark | Apodex 1.1 | Mellum2.1-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| IFEval | Coming soon | 90.6% | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- Apodex 1.1 public-lane score: Coming soon
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon

| Benchmark | Apodex 1.1 | Mellum2.1-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| IMO 2026 | 31/42 | Coming soon | Coming soon |

## FAQ

### Is there enough evidence to pick between Apodex 1.1 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

- [Apodex 1.1 vs Apodex 1.1 Mini](/compare/apodex-1-1-vs-apodex-1-1-mini)
- [Mellum2.1-12B-A2.5B-Thinking vs Apodex 1.1 Mini](/compare/apodex-1-1-mini-vs-mellum2-1-12b-a2-5b-thinking)
- [Apodex 1.1 vs Claude Opus 5.5](/compare/apodex-1-1-vs-claude-opus-5-5)
- [Mellum2.1-12B-A2.5B-Thinking vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-mellum2-1-12b-a2-5b-thinking)

## Explore More

- [Apodex 1.1 profile](/models/apodex-1-1)
- [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)