Upstage · API-only (closed weights)

solar-pro3

solar-pro3 is an API-only (closed weights) language model from Upstage, released January 26, 2026. Its makers disclosed about 102B parameters. The context window is 128K tokens. API price: $0.25 input / $0.25 output per million tokens.

While Solar Pro 2 set the standard for production-ready LLMs with a focus on efficiency and stability suitable for enterprise deployment, Solar Pro 3 builds on that foundation by taking reasoning accuracy and instruction-following quality one step further. This release is not simply about increasing raw performance.

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Lab

Upstage

Released

January 26, 2026

Weights

API-only (closed weights)

Parameters

102B disclosed

Context

128K

Price / M tokens

$0.25 / $0.25 in / out

Epoch ECI

not yet rated

Benchmark results

Epoch AI has not published results for solar-pro3 yet. New models are usually evaluated within days to weeks.

Links

Announcement

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Solar Mini 4 · Solar Pro 4 · Solar Open2 250B · Solar Open 100B · solar-pro2