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Upstage: Solar Pro 3

upstage/solar-pro-3:free

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

Price

Free

Context

128K

Released

Jan 27, 2026

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Activity

Token volume and request traffic to this model over time.

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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.

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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.

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Frequently asked questions

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.

Yes. The pricing shown on this page for Solar Pro 3 is zero, so you are not charged for prompt or completion tokens. Free endpoints are rate limited — see the rate limit docs.

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

Solar Pro 4 is another text model from Upstage.

Solar Pro 3 was released on January 27, 2026.