Step 5 Preview (Tested): This MODEL BLEW MY BRAINS AWAY!
Visit StepFun: https://platform.stepfun.ai/ In this video, I’ll be testing Step 5 Preview, StepFun’s new flagship AI model, across all eight KingBench 3 tasks. We’ll explore its coding and reasoning capabilities through interactive 3D projects, a playable archery game, an elevator simulation, SVG generation, and a locally fine-tuned Gemma 2B model with a working web interface. -- Key Takeaways: 🚀 Step 5 Preview supports a one-million-token context window and up to 64,000 output tokens. 🧠 Its mixture-of-experts architecture has 600 billion total parameters, with 27 billion active per token. 💻 Step works inside OpenCode to create files, run commands, test projects, and inspect its own output. 🏹 The playable archery game was one of its strongest results, scoring 9.5 out of 10. 🦥 Step completed a local LoRA fine-tuning workflow and built a web app powered by the trained Gemma 2B model. 🎮 Seven of the eight KingBench tasks received scores of at least eight out of ten. 📊 Step 5 Preview achieved 67 out of 80 points, giving it a final score of 83.75 percent. 💸 StepFun’s international API pricing starts at one dollar per million uncached input tokens. ⚖️ Step finished above the retained MiMo and GLM 5.3 Flash reference scores, while GLM 5.3 remained ahead. 👍 Overall, Step 5 Preview is a promising model for interactive prototypes, coding agents, and local AI development workflows.
