# Ornith-1.5-397B vs Seed 2.1 Turbo

> Side-by-side benchmark comparison for Ornith-1.5-397B and Seed 2.1 Turbo across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/ornith-1-5-397b-vs-seed-2-1-turbo
- Last updated: September 10, 2026

- Shared sourced benchmarks: 3
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Evidence is too thin for a benchmark verdict: Ornith-1.5-397B and Seed 2.1 Turbo share only 3 sourced benchmark rows.

## Summary

- Only 3 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 Turbo has the lower published output-token price.
- Ornith-1.5-397B has the larger published context window at 262K.

## Model Snapshot

| Property | Ornith-1.5-397B | Seed 2.1 Turbo |
|----------|----------|----------|
| Creator | Ornith AI | ByteDance |
| Type | Open Weight | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 262K | 256K |
| Independent public score (not head-to-head) | 65.4 | null |
| Benchmarks Covered | 18 | 11 |
| Pricing (input/output) | $0.00 / $0.00 | Pricing unavailable / Pricing unavailable |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Ornith-1.5-397B public-lane score: 60.8 (Estimated · #18/152)
- Seed 2.1 Turbo public-lane score: Coming soon

| Benchmark | Ornith-1.5-397B | Seed 2.1 Turbo | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 86.1% | 67.6% | Ornith-1.5-397B |
| HLE w/ tools | 56.1% | Coming soon | Coming soon |
| MCP Atlas | 80% | Coming soon | Coming soon |
| Toolathlon-Verified | 71.2% | Coming soon | Coming soon |
| WideResearch | 80.8% | Coming soon | Coming soon |
| BrowseComp | 86.6% | Coming soon | Coming soon |
| Claw-Eval | 81.4% | Coming soon | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Ornith-1.5-397B public-lane score: 58.8 (Estimated · #26/151)
- Seed 2.1 Turbo public-lane score: Coming soon

| Benchmark | Ornith-1.5-397B | Seed 2.1 Turbo | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 86.1% | 67.6% | Ornith-1.5-397B |
| SWE-bench Verified | 86% | Coming soon | Coming soon |
| SWE-bench Pro | 65.1% | Coming soon | Coming soon |
| SWE Multilingual | 79.6% | Coming soon | Coming soon |
| DeepSWE | 56.0% | Coming soon | Coming soon |
| frontierBench | 13.5% | Coming soon | Coming soon |
| NL2Repo | 59.5% | 43.7% | Ornith-1.5-397B |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Ornith-1.5-397B public-lane score: Coming soon
- Seed 2.1 Turbo public-lane score: Coming soon

| Benchmark | Ornith-1.5-397B | 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
- Ornith-1.5-397B public-lane score: 60.4 (Estimated · #36/183)
- Seed 2.1 Turbo public-lane score: Coming soon

| Benchmark | Ornith-1.5-397B | Seed 2.1 Turbo | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 92.8% | Coming soon | Coming soon |
| GPQA-D | 92.8% | Coming soon | Coming soon |
| HLE | 44.6% | Coming soon | Coming soon |
| HLE w/o tools | 44.6% | Coming soon | Coming soon |
| SuperGPQA | Coming soon | 67.4% | Coming soon |

## FAQ

### Is there enough evidence to pick between Ornith-1.5-397B and Seed 2.1 Turbo?

Not yet. The models share only 3 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

- [Ornith-1.5-397B vs Ornith-1.5-35B-A3B](/compare/ornith-1-5-35b-a3b-vs-ornith-1-5-397b)
- [Seed 2.1 Turbo vs Ornith-1.5-35B-A3B](/compare/ornith-1-5-35b-a3b-vs-seed-2-1-turbo)
- [Ornith-1.5-397B vs Ornith-1.5-9B](/compare/ornith-1-5-397b-vs-ornith-1-5-9b)
- [Seed 2.1 Turbo vs Ornith-1.5-9B](/compare/ornith-1-5-9b-vs-seed-2-1-turbo)

## Explore More

- [Ornith-1.5-397B profile](/models/ornith-1-5-397b)
- [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)