# Mellum2-12B-A2.5B-Instruct vs Seed 2.1 Turbo

> Side-by-side benchmark comparison for Mellum2-12B-A2.5B-Instruct and Seed 2.1 Turbo across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/mellum2-12b-a2-5b-instruct-vs-seed-2-1-turbo
- Last updated: September 10, 2026

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

## Quick Verdict

No benchmark verdict yet: there is no shared sourced benchmark row for Mellum2-12B-A2.5B-Instruct and Seed 2.1 Turbo.

## Summary

- Mellum2-12B-A2.5B-Instruct and Seed 2.1 Turbo 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 | Mellum2-12B-A2.5B-Instruct | Seed 2.1 Turbo |
|----------|----------|----------|
| Creator | JetBrains | ByteDance |
| Type | Open Weight | Proprietary |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 128K | 256K |
| Independent public score (not head-to-head) | null | null |
| Benchmarks Covered | 6 | 11 |
| Pricing (input/output) | N/A | Pricing unavailable / Pricing unavailable |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Mellum2-12B-A2.5B-Instruct public-lane score: 45.3 (Estimated · #83/152)
- Seed 2.1 Turbo public-lane score: Coming soon

| Benchmark | Mellum2-12B-A2.5B-Instruct | Seed 2.1 Turbo | Winner |
|-----------|-----------|-----------|--------|
| BFCL v4 | 44.2% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 67.6% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Mellum2-12B-A2.5B-Instruct public-lane score: Coming soon
- Seed 2.1 Turbo public-lane score: Coming soon

| Benchmark | Mellum2-12B-A2.5B-Instruct | Seed 2.1 Turbo | Winner |
|-----------|-----------|-----------|--------|
| LiveCodeBench v6 | 37.2% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 67.6% | Coming soon |
| NL2Repo | Coming soon | 43.7% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Mellum2-12B-A2.5B-Instruct public-lane score: Coming soon
- Seed 2.1 Turbo public-lane score: Coming soon

| Benchmark | Mellum2-12B-A2.5B-Instruct | Seed 2.1 Turbo | Winner |
|-----------|-----------|-----------|--------|
| MathVision | Coming soon | 90.1% | Coming soon |
| MMMU-Pro | Coming soon | 80.1% | Coming soon |
| ZeroBench | Coming soon | 11.0% | Coming soon |
| BabyVision | Coming soon | 62.9% | Coming soon |
| CharXiv | Coming soon | 82.5% | Coming soon |
| ERQA | Coming soon | 71.3% | Coming soon |
| Video-MME | Coming soon | 89.0% | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Mellum2-12B-A2.5B-Instruct public-lane score: 45.6 (Estimated · #106/183)
- Seed 2.1 Turbo public-lane score: Coming soon

| Benchmark | Mellum2-12B-A2.5B-Instruct | Seed 2.1 Turbo | Winner |
|-----------|-----------|-----------|--------|
| MMLU-Redux | 78.1% | Coming soon | Coming soon |
| GPQA | 40.9% | Coming soon | Coming soon |
| GPQA-D | 40.9% | Coming soon | Coming soon |
| SuperGPQA | Coming soon | 67.4% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Mellum2-12B-A2.5B-Instruct public-lane score: Coming soon
- Seed 2.1 Turbo public-lane score: Coming soon

| Benchmark | Mellum2-12B-A2.5B-Instruct | Seed 2.1 Turbo | Winner |
|-----------|-----------|-----------|--------|
| IFEval | 75.8% | Coming soon | Coming soon |

## FAQ

### Can I compare Mellum2-12B-A2.5B-Instruct and Seed 2.1 Turbo 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

- [Mellum2-12B-A2.5B-Instruct vs Mellum2-12B-A2.5B-Thinking](/compare/mellum2-12b-a2-5b-instruct-vs-mellum2-12b-a2-5b-thinking)
- [Seed 2.1 Turbo vs Mellum2-12B-A2.5B-Thinking](/compare/mellum2-12b-a2-5b-thinking-vs-seed-2-1-turbo)
- [Mellum2-12B-A2.5B-Instruct vs Seed 2.1 Pro](/compare/mellum2-12b-a2-5b-instruct-vs-seed-2-1-pro)
- [Seed 2.1 Turbo vs Seed 2.1 Pro](/compare/seed-2-1-pro-vs-seed-2-1-turbo)

## Explore More

- [Mellum2-12B-A2.5B-Instruct profile](/models/mellum2-12b-a2-5b-instruct)
- [Seed 2.1 Turbo profile](/models/seed-2-1-turbo)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)