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Learn more → Upstage Studio — Build and deploy your agent. Learn more → Solutions Resources Company Pricing Try now Try demo Contact us en At Upstage, we're dedicated to building AI models that truly understand and communicate in multiple languages, and Korean is one of the most important languages we consider. With the recent update of Solar Pro and Solar Mini (released Apr 22), we're excited to introduce major improvements in Korean fluency, across a wide range of use cases. A leap forward in Korean fluency Korean fluency is more than just grammar—it's about sounding natural, clear, and aligned with the user's intent. Our internal metric, ko-fluency tracks exactly that—and both Solar Pro and Mini saw significant upgrades in this release. Solar Pro : Increased from 74.4 to 82.0 by +7.6 points, resulting in smoother, more natural conversations. Solar Mini : Increased from 81.2 to 82.1 by +0.9 points, a meaningful gain at this scale. An example of improvement in Korean fluency. 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