On April 2, 2026, JieYue Stellar officially launched its newest model, the Step 3.5 Flash 2603, exclusively available to all subscribers of the Step Plan. This model represents an upgraded iteration of the Step 3.5 Flash, featuring a newly introduced "Low Think Mode." This mode significantly cuts down on token usage in applicable scenarios while simultaneously boosting output efficiency. When operating in the default "High Think Mode," the model preserves its top-tier reasoning capabilities, achieving a 14% reduction in token consumption and accelerating Agent task execution times. Switching to "Low Think Mode" results in a remarkable 56% decrease in token usage, accompanied by a substantial increase in reasoning efficiency, with only a minor 4% dip in performance.

The Step 3.5 Flash 2603 has undergone targeted enhancements tailored for specific use cases, including code generation, debugging, refactoring, and Agent workflows. These improvements ensure better compatibility with Coding and Agent frameworks, ultimately providing users with a more seamless experience, heightened stability, and optimized token efficiency.