NVIDIA AI(@NVIDIAAI):Congrats to StepFun on Step 5 Preview 🙌 Their largest open weights release. The 600B MoE model is built to handle agent tasks lasting up to 24 hours. The model runs at nearly 8K tokens/sec/GPU on NVIDIA GB300 using NVFP4. NVP4 checkpoint: https://t.co/poBcZXeWqY Deploy with @SGL_project - https://t.co/2iE8ytEk50 or @vLLM_project - https://t.co/PedItg9OR4 Post-train with NeMo Automodel: https://t.co/KxNt53Sb8k Run it with NVIDIA NIM using a single command:

2026.10.15 13:52

Congrats to StepFun on Step 5 Preview 🙌 Their largest open weights release. The 600B MoE model is built to handle agent tasks lasting up to 24 hours. The model runs at nearly 8K tokens/sec/GPU on NVIDIA GB300 using NVFP4. NVP4 checkpoint: Deploy with @SGL_project - or @vLLM_project - Post-train with NeMo Automodel: Run it with NVIDIA NIM using a single command:

StepFun@StepFun_ai

2026.10.15 13:00

Step 5 Preview is now open weights. BF16 and FP8 weights are live on Hugging Face and ModelScope, together with our technical blog. • Sparse MoE: 600B total, 27B active per token • 1M-token context window • Native text and vision input • Built for long-horizon agentic work: coding, software engineering, professional knowledge work and finance Frontier intelligence, open weights. Build what's next. Hugging Face: ModelScope: GitHub: