Seed-OSS-36B
Seed-OSS-36B is a foundation model developed by ByteDance's Seed team. It is equipped with an approximate parameter scale of 360 billion and an extensive 512K context window.
Parameters
360.0B
Context Window
512K
License
Apache 2.0
Release Date
2025-08-20
API Pricing
API pricing for this model is not yet available
Strengths
- ・Massive parameter scale of 360B
- ・Very long context understanding up to 512K
- ・Open license under Apache 2.0
Weaknesses
- ・Large file size reaching 72GB
- ・Requires high-performance computational resources
- ・Potentially high inference costs
Use Cases
- ・Ultra-long document analysis
- ・Large-scale data context processing
- ・Secondary development on open-source foundation
Deep Analysis
Architecture
Dense Transformer (36B)
Open-source from ByteDance Seed
Context Window
512K tokens
Native long context
Training Data
12T tokens
Release Date
August 21, 2025
License
Apache 2.0
GitHub Stars
875
ByteDance-Seed/seed-oss
Key Feature
Flexible thinking budget control
Dynamic reasoning length adjustment
Strengths
- ・Native 512K long context
- ・Flexible thinking budget control for efficiency
- ・Apache 2.0 license
- ・Strong reasoning, coding, and agent capabilities
- ・Both Base and Instruct variants released
- ・Research-friendly (with/without synthetic data variants)
Weaknesses
- ・36B parameter requires significant compute
- ・Relatively new model
- ・Limited production track record
Competitor Comparison
| Model | Arena | SWE | GPQA | Price |
|---|---|---|---|---|
| Qwen 2.5 72B | - | - | - | Free (open) |
| Llama 3.1 70B | - | - | - | Free (open) |
| Mistral Large 3 | - | - | - | Paid API |
Seed-OSS-36B is ByteDance Seed Team's open-source language model with native 512K context and flexible thinking budget control. Released August 2025 under Apache 2.0, it achieves strong results on mainstream benchmarks while maintaining good practical performance at low cost.
Analysis generated: 2026-05-24