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Upstage introduced Solar Mini 4 in an announcement dated 1 October 2026, a model designed for repeated tasks such as retrieving information, producing structured data and using software tools.
The company says the model contains 35 billion parameters but activates three billion for each token. It supports a context window of up to 512,000 tokens, JSON outputs and parallel tool calls. Developers can adjust its reasoning settings for tasks that require additional analysis.
Upstage lists availability through its Console API, Solar Chat and OpenRouter, along with support for deployment on customers’ own infrastructure. The announcement says the full model weights must fit in memory even though only some parameters are active during each token’s processing.
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