# Quasar 438B vs Seed 2.1 Pro

> Side-by-side benchmark comparison for Quasar 438B and Seed 2.1 Pro across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/quasar-438b-vs-seed-2-1-pro
- Last updated: September 10, 2026

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

## Quick Verdict

Evidence is too thin for a benchmark verdict: Quasar 438B and Seed 2.1 Pro 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.
- Seed 2.1 Pro has the lower published output-token price.
- Quasar 438B has the larger published context window at 1M.

## Model Snapshot

| Property | Quasar 438B | Seed 2.1 Pro |
|----------|----------|----------|
| Creator | Multiverse Computing | ByteDance |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 256K |
| Independent public score (not head-to-head) | null | null |
| Benchmarks Covered | 2 | 11 |
| Pricing (input/output) | $0.60 / $1.80 | Pricing unavailable / Pricing unavailable |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Quasar 438B public-lane score: Coming soon
- Seed 2.1 Pro public-lane score: Coming soon

| Benchmark | Quasar 438B | Seed 2.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 69.3% | 71.0% | Seed 2.1 Pro |

### Coding

- Winner: Insufficient shared evidence
- Quasar 438B public-lane score: Coming soon
- Seed 2.1 Pro public-lane score: Coming soon

| Benchmark | Quasar 438B | Seed 2.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 69.3% | 71.0% | Seed 2.1 Pro |
| NL2Repo | Coming soon | 47% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Quasar 438B public-lane score: Coming soon
- Seed 2.1 Pro public-lane score: Coming soon

| Benchmark | Quasar 438B | Seed 2.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| MathVision | Coming soon | 92.6% | Coming soon |
| MMMU-Pro | Coming soon | 81.6% | Coming soon |
| ZeroBench | Coming soon | 18.0% | Coming soon |
| BabyVision | Coming soon | 73.7% | Coming soon |
| CharXiv | Coming soon | 85.4% | Coming soon |
| ERQA | Coming soon | 72.0% | Coming soon |
| Video-MME | Coming soon | 89.2% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Quasar 438B public-lane score: 73.4 (Unranked · 2 rankable rows)
- Seed 2.1 Pro public-lane score: Coming soon

### Knowledge

- Winner: Insufficient shared evidence
- Quasar 438B public-lane score: Coming soon
- Seed 2.1 Pro public-lane score: Coming soon

| Benchmark | Quasar 438B | Seed 2.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| SuperGPQA | Coming soon | 70.8% | Coming soon |

## FAQ

### Is there enough evidence to pick between Quasar 438B and Seed 2.1 Pro?

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

- [Quasar 438B vs Seed 2.1 Turbo](/compare/quasar-438b-vs-seed-2-1-turbo)
- [Seed 2.1 Pro vs Seed 2.1 Turbo](/compare/seed-2-1-pro-vs-seed-2-1-turbo)
- [Quasar 438B vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-quasar-438b)
- [Seed 2.1 Pro vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-seed-2-1-pro)

## Explore More

- [Quasar 438B profile](/models/quasar-438b)
- [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)