Upstage: Solar Pro 3

Solar Pro 3 is a text-only model from Upstage with a 128,000-token context window. It supports tool use and reasoning, which makes it capable of multi-step and agentic workflows, though structured output support is unconfirmed. There is no documented cap on completion tokens in the available specs, so output length behavior in practice is worth verifying before committing to it for generation-heavy tasks. On price, it sits at $0.15 per million input tokens and $0.60 per million output tokens, which is competitive for models with reasoning and tool-use support. The benchmark picture is thin, however: a blended score of 14.4 across only three benchmarks provides limited basis for comparison. Agentic performance scores notably low at 4.4 despite the model claiming agentic support. Teams should treat its benchmarks as preliminary, and run their own evaluations before shortlisting Solar Pro 3 for production use.