Stepfun new model "Step 5 Preview" just leaked
Summary
Stepfun's new AI model, Step 5 Preview, has been leaked, showing a significant version jump from 3.7 to 5.0 with major performance improvements.
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this looks promising: stepfun-ai/Step-5-Preview-BF16 · Hugging Face
StepFun AI has released a preview version of their Step-5 model in BF16 format on Hugging Face, indicating a promising development in AI model accessibility and performance.
@jakevin7: Step This model's progress this time is pretty significant. I tested the Step 5 Preview model, and the overall effect f…
The user tested the Step 5 Preview model and found it performs well on long-sequence tasks in frontend coding, comparing it favorably with models like Fable and GPT5-Sol.
@liulicheng10: Proud of what we’ve achieved!
StepFun introduces Step 5 Preview, a new flagship AI model for agentic work with frontier-level performance in software engineering and finance, featuring a 600B parameter scale.
StepFun joins the frontier: a previously non-frontier Chinese lab (StepFun) released a Kimi K3-level model, 3 times cheaper per Artificial Analysis
StepFun, a Chinese AI lab, has released Step 5 Preview, which matches the performance of Kimi K3 at one-third the cost, marking its entry into the AI frontier.
StepFun 3.7 Flash
StepFun released Step 3.7 Flash, a high-efficiency multimodal model optimized for real-world agentic tasks, featuring improved coding benchmarks (SWE-Bench Pro, Terminal-Bench) and compatibility with multiple agent harnesses.