Step 5 Preview ranks No. 7 among open-weight models on Vals
Vals AI says StepFun has debuted on the Vals leaderboard with Step 5 Preview. Among open-weight models, it ranks No. 7, just ahead of Qwen 3.8 Max. The listed cost is $2.54 per task.
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StepFun Step 5 Preview scores 44 on Artificial Analysis Intelligence Index at $0.71 per task
StepFun highlighted Artificial Analysis results putting Step 5 Preview at 44 on the Intelligence Index and $0.71 per task, with more to come on Oct 15. The evaluation describes a 600B/27B MoE flagship with first-party API access and open weights planned for October 15.
StepFun says it has open-sourced onPanda
StepFun says onPanda, its internal tool for LLM data annotation and model inspection, is now open source. It reports a 52% lower median annotation time than manual post-editing and on-policy fidelity of ΔPPL under 1% versus the model’s resampling baseline.
Step Code can be installed on macOS, Linux, or WSL
StepFun provides a bash script to install Step Code on macOS, Linux, or WSL. On Windows, it recommends WSL and says PowerShell support is currently in beta.
Step Code includes StepPage for one-command static site publishing
StepPage publishes a local static site to a shareable URL with one command, with version management and rollback built in so development, debugging, and delivery can stay in the same terminal.
StepFun open-sources Step Code v0.1.0 under the MIT License
StepFun has released the Step Code v0.1.0 command-line tool as open source under the MIT License, including one-command static site publishing with StepPage. StepFun reports 80.9% on Terminal-Bench 2.1 and 73.3% on Multi-Frame, its 150-task long-horizon benchmark.