# Grok 4.6 vs Mellum2-12B-A2.5B-Thinking

> Side-by-side benchmark comparison for Grok 4.6 and Mellum2-12B-A2.5B-Thinking across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/grok-4-6-vs-mellum2-12b-a2-5b-thinking
- Last updated: September 25, 2026

- Shared sourced benchmarks: 0
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

No benchmark verdict yet: there is no shared sourced benchmark row for Grok 4.6 and Mellum2-12B-A2.5B-Thinking.

## Summary

- Grok 4.6 and Mellum2-12B-A2.5B-Thinking do not currently share a sourced benchmark row. The mirror therefore compares metadata, pricing, context windows, and each model's separately reported coverage without naming a benchmark winner.

## Model Snapshot

| Property | Grok 4.6 | Mellum2-12B-A2.5B-Thinking |
|----------|----------|----------|
| Creator | xAI | JetBrains |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 500K | 128K |
| Independent public score (not head-to-head) | 69.19 | null |
| Benchmarks Covered | 17 | 6 |
| Pricing (input/output) | $2.00 / $6.00 | N/A |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Grok 4.6 public-lane score: 67.9 (Supported · #8/105)
- Mellum2-12B-A2.5B-Thinking public-lane score: Coming soon

| Benchmark | Grok 4.6 | Mellum2-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 3.0 | 26.5% | Coming soon | Coming soon |
| APEX-Agents | 57.5% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 78.3% | Coming soon | Coming soon |
| ApprenticeBench | 13% | Coming soon | Coming soon |
| BFCL v4 | Coming soon | 45.6% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Grok 4.6 public-lane score: 62 (Supported · #14/135)
- Mellum2-12B-A2.5B-Thinking public-lane score: Coming soon

| Benchmark | Grok 4.6 | Mellum2-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| Bug Hunt Bench | 27 fixes | Coming soon | Coming soon |
| DeepSWE | 65.9% | Coming soon | Coming soon |
| cursorBench32 | 70.8% | Coming soon | Coming soon |
| FrontierCode 1.1 Extended | 61.3% | Coming soon | Coming soon |
| VulcanBench v3 | 87.0% | Coming soon | Coming soon |
| FrontierSWE v2 | 25.3% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 88.2% | Coming soon | Coming soon |
| SWE-bench (Vals) | 95.6% | Coming soon | Coming soon |
| LiveCodeBench v6 | Coming soon | 69.9% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Grok 4.6 public-lane score: 57.6 (#16/19)
- Mellum2-12B-A2.5B-Thinking public-lane score: Coming soon

| Benchmark | Grok 4.6 | Mellum2-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-1 | 87.00% | Coming soon | Coming soon |
| ARC-AGI-2 | 67.1% | Coming soon | Coming soon |
| ARC-AGI-3 | 2.1% | Coming soon | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Grok 4.6 public-lane score: 69 (Supported · #13/158)
- Mellum2-12B-A2.5B-Thinking public-lane score: Coming soon

| Benchmark | Grok 4.6 | Mellum2-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| GPQA Diamond (Vals) | 94.7% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 89.4% | Coming soon | Coming soon |
| MMLU-Redux | Coming soon | 86.2% | Coming soon |
| GPQA | Coming soon | 57.6% | Coming soon |
| GPQA-D | Coming soon | 57.6% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Grok 4.6 public-lane score: Coming soon
- Mellum2-12B-A2.5B-Thinking public-lane score: Coming soon

| Benchmark | Grok 4.6 | Mellum2-12B-A2.5B-Thinking | Winner |
|-----------|-----------|-----------|--------|
| IFEval | Coming soon | 76.5% | Coming soon |

## FAQ

### Can I compare Grok 4.6 and Mellum2-12B-A2.5B-Thinking on BenchLM yet?

Not fully yet. BenchLM is tracking both models, but sourced benchmark coverage is still incomplete for a fair score-level comparison.

### Why does this page show "coming soon" values?

BenchLM only calls winners when public benchmark coverage is available on both sides of the comparison.

## Related Comparisons

- [Grok 4.6 vs Mellum2-12B-A2.5B-Instruct](/compare/grok-4-6-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)
- [Grok 4.6 vs GPT-6 Astra](/compare/gpt-6-astra-vs-grok-4-6)
- [Mellum2-12B-A2.5B-Thinking vs GPT-6 Astra](/compare/gpt-6-astra-vs-mellum2-12b-a2-5b-thinking)

## Explore More

- [Grok 4.6 profile](/models/grok-4-6)
- [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)