# Qwen3.8-27B vs Seed 2.1 Pro

> Side-by-side benchmark comparison for Qwen3.8-27B and Seed 2.1 Pro across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/qwen3-8-27b-vs-seed-2-1-pro
- Last updated: September 10, 2026

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

## Quick Verdict

Pick Qwen3.8-27B if you want the stronger benchmark profile. Seed 2.1 Pro only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Qwen3.8-27B leads overall 64.52 to 0.
- The biggest single benchmark swing is BabyVision in Multimodal & Grounded, with scores of 65.7% and 73.7%.
- Seed 2.1 Pro is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- Qwen3.8-27B also has the larger context window at 262K.

## Model Snapshot

| Property | Qwen3.8-27B | Seed 2.1 Pro |
|----------|----------|----------|
| Creator | Alibaba | ByteDance |
| Type | Open Weight | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 262K | 256K |
| Overall Score | 64.52 | null |
| Benchmarks Covered | 33 | 11 |
| Pricing (input/output) | $0.00 / $0.00 | Pricing unavailable / Pricing unavailable |

## Category Breakdown

### Agentic

- Winner: Coming soon
- Qwen3.8-27B public-lane score: 63.4 (Supported · #13/152)
- Seed 2.1 Pro public-lane score: Coming soon

| Benchmark | Qwen3.8-27B | Seed 2.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 73.0% | 71.0% | Qwen3.8-27B |
| CoWorkBench | 70.7% | Coming soon | Coming soon |
| JobBench | 33.4% | Coming soon | Coming soon |
| Agents' Last Exam | 42.9% | Coming soon | Coming soon |
| OSWorld-Verified | 84.3% | Coming soon | Coming soon |
| WebArena-Verified | 64.8% | Coming soon | Coming soon |
| AndroidWorld | 81.9% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 58.4% | Coming soon | Coming soon |

### Coding

- Winner: Coming soon
- Qwen3.8-27B public-lane score: 53.9 (Supported · #43/151)
- Seed 2.1 Pro public-lane score: Coming soon

| Benchmark | Qwen3.8-27B | Seed 2.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 73.0% | 71.0% | Qwen3.8-27B |
| SWE-bench Pro | 61.7% | Coming soon | Coming soon |
| NL2Repo | 42.3% | 47% | Seed 2.1 Pro |
| DeepSWE | 42.2% | Coming soon | Coming soon |
| LiveCodeBench v6 | 90.3% | Coming soon | Coming soon |
| VulcanBench v3 | 82.6% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 84.0% | Coming soon | Coming soon |
| SWE-bench (Vals) | 86.0% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Coming soon
- Qwen3.8-27B public-lane score: 80 (#11/48)
- Seed 2.1 Pro public-lane score: Coming soon

| Benchmark | Qwen3.8-27B | Seed 2.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| MathVision | 90.0% | 92.6% | Seed 2.1 Pro |
| MathVision w/ Python | 94.6% | Coming soon | Coming soon |
| BabyVision | 65.7% | 73.7% | Seed 2.1 Pro |
| BabyVision w/ Python | 85.6% | Coming soon | Coming soon |
| Vision2Web | 62.9% | Coming soon | Coming soon |
| CharXiv w/o tools | 83.7% | Coming soon | Coming soon |
| CharXiv | 90.2% | 85.4% | Qwen3.8-27B |
| OmniDocBench 1.5 | 91.1% | Coming soon | Coming soon |
| RealWorldQA | 85.9% | Coming soon | Coming soon |
| ERQA | 65.5% | 72.0% | Seed 2.1 Pro |
| MMMU-Pro | Coming soon | 81.6% | Coming soon |
| ZeroBench | Coming soon | 18.0% | Coming soon |
| Video-MME | Coming soon | 89.2% | Coming soon |

### Reasoning

- Winner: Coming soon
- Qwen3.8-27B public-lane score: 77.4 (#7/20)
- Seed 2.1 Pro public-lane score: Coming soon

### Knowledge

- Winner: Coming soon
- Qwen3.8-27B public-lane score: 54.1 (Supported · #58/183)
- Seed 2.1 Pro public-lane score: Coming soon

| Benchmark | Qwen3.8-27B | Seed 2.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 89.2% | Coming soon | Coming soon |
| GPQA-D | 89.2% | Coming soon | Coming soon |
| HLE | 30.8% | Coming soon | Coming soon |
| HLE w/o tools | 30.8% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | 88.9% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 84.3% | Coming soon | Coming soon |
| SuperGPQA | Coming soon | 70.8% | Coming soon |

### Instruction Following

- Winner: Coming soon
- Qwen3.8-27B public-lane score: 84.7 (#45/123)
- Seed 2.1 Pro public-lane score: Coming soon

| Benchmark | Qwen3.8-27B | Seed 2.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| IFBench | 79.5% | Coming soon | Coming soon |

## FAQ

### Which is better overall, Qwen3.8-27B or Seed 2.1 Pro?

Qwen3.8-27B is ahead overall on BenchLM right now.

### How many benchmarks does Qwen3.8-27B cover on BenchLM?

Qwen3.8-27B currently has 33 sourced benchmark scores on BenchLM.

### How many benchmarks does Seed 2.1 Pro cover on BenchLM?

Seed 2.1 Pro currently has 11 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Qwen3.8-27B vs Seed 2.1 Turbo](/compare/qwen3-8-27b-vs-seed-2-1-turbo)
- [Seed 2.1 Pro vs Seed 2.1 Turbo](/compare/seed-2-1-pro-vs-seed-2-1-turbo)
- [Qwen3.8-27B vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-qwen3-8-27b)
- [Seed 2.1 Pro vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-seed-2-1-pro)

## Explore More

- [Qwen3.8-27B profile](/models/qwen3-8-27b)
- [Seed 2.1 Pro profile](/models/seed-2-1-pro)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)