- 2Releases tracked
- Sep 22Latest · Solar Mini 4
- 0%Open-weight
- KRSeoul, South Korea
Upstage is a Seoul, South Korea-based AI company that builds the Solar family of large language models and document AI products for enterprises. Founded in 2020, it has a team of more than 100 people working remotely with hubs in Seoul, San Francisco and Tokyo, and says it has raised over $100M from investors including SoftBank Ventures Asia, SK Networks and Korea Telecom. Its lineup includes Solar Pro 4 for multi-step agentic tasks, Document Parse for converting complex documents into LLM-readable formats, Information Extract and Upstage Studio. Its tracked release is closed-weight: Solar Mini 4, launched on September 22, 2026, is a 35B MoE model with 3B active parameters, Korean, English and Japanese support, and 512K context.
Upstage (Solar)
2 releases latest Sep 22, 2026
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Solar Mini 4
35B MoE (3B active) cost-efficient agent model with Korean/English/Japanese, reasoning mode, and 512K context.
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Solar Pro 4
Upstage flagship for agentic use, strongest at documents, coding and business tasks. 512K context, 128K output, reasoning mode; params undisclosed. Replaces Solar Pro 3.
Upstage (Solar) FAQ
- What is Upstage (Solar)'s latest AI model?
- Upstage (Solar)'s most recent release in the Startrise tracker is Solar Mini 4, released Sep 22, 2026.
- How many AI models has Upstage (Solar) released?
- Startrise tracks 2 notable Upstage (Solar) releases since January 2025, from Solar Pro 4 (Aug 6, 2026) to Solar Mini 4.
- Does Upstage (Solar) release open-weight models?
- None of the 2 tracked Upstage (Solar) releases ship with downloadable weights; they are available through Upstage (Solar)'s apps and API.
- Where is Upstage (Solar) based?
- Upstage (Solar) is based in Seoul, South Korea.