What is the context length of Solar Pro 3?

Solar Pro 3 has a 128,000 token context window.

What other text models does Upstage have?

Solar Decide Flash, Solar Decide, Solar Mini 4 and 1 more are other text models from Upstage.

When was Solar Pro 3 released?

Solar Pro 3 was released on January 27, 2026.

Solar Pro 3 was retired on October 30, 2026. Please migrate to Solar Pro 4.

Upstage: Solar Pro 3

upstage/solar-pro-3

Solar Pro 3 is Upstage's powerful Mixture-of-Experts (MoE) language model. With 102B total parameters and 12B active parameters per forward pass, it delivers exceptional performance while maintaining computational efficiency. Optimized for Korean with English and Japanese support.

Modalities

Context

128K

Released

Jan 27, 2026

Not currently available through EU in-region routing. In-region routing docs

More models from upstage

Solar Decide Flash

Solar Decide Flash is Upstage's low-latency structured decision model, a faster variant of Solar Decide built on Solar Mini 4 and served through the System One (/v1/systemone) API. Instead of generating text, it reads a state and answers typed questions, returning a choice, a score, or a yes/no answer, each with a probability taken directly from the model. Each decision is a single forward pass, and output tokens are free.

It is tuned for consistently fast response times in routing, classification, and policy checks. It keeps the 512K context window, so a full document can serve as the state, and carries Solar Mini 4's Korean-language strength.

Decisions$0.05 / $0

Solar Decide

Solar Decide is Upstage's structured decision model, served as a System One endpoint on Solar Mini 4. Send a state along with typed questions, and it returns a choice, a score, or a yes/no answer, each with a calibrated probability taken directly from the model rather than written out as text. Because it generates no prose, each decision takes a single forward pass and output tokens are free. With a 512K context window, an entire document can serve as the state. Solar Decide uses the same /v1/systemone schema as Jev, bringing Solar Mini 4's strong Korean understanding to routing, classification, and policy checks.

Decisions$0.05 / $0

Solar Mini 4

Solar Mini 4 is Upstage's compact, cost-efficient language model, a 35B-parameter mixture-of-experts with 3B active parameters and a 524K context window. It is built for agentic use cases where response speed and cost matter, with fluent Korean alongside strong English and Japanese, and support for long-context workloads.

When using BYOK with ZDR enforcement, the Console API key must belong to a ZDR-enabled Upstage organization. Contact Upstage to enable ZDR on your org.

Text524K context$0.05 / $0.20

Solar Pro 4

Solar Pro 4 is Upstage's cost-efficient large language model, featuring a 524K context window. It is built for long-horizon tasks and agentic workflows, with strong capabilities in office productivity, document-intensive work, and coding.

When using BYOK with ZDR enforcement, the Console API key must belong to a ZDR-enabled Upstage organization. Contact Upstage to enable ZDR on your org.

Text524K context$0.15 / $0.60

Upstage: Solar Pro 3

Activity

Frequently asked questions

Explore more models

More models from upstage

More models from upstage

Upstage: Solar Pro 3

Activity

Frequently asked questions

What is Solar Pro 3?

What is the context length of Solar Pro 3?

What other text models does Upstage have?

When was Solar Pro 3 released?

Explore more models

More models from upstage

More models from upstage