#stepfun

Step 5 Preview ranks No. 7 among open-weight models on Vals

Vals AI says StepFun’s Step 5 Preview has debuted on the Vals leaderboard at No. 7 among open-weight models, just ahead of Qwen 3.8 Max, at $2.54 per task.

StepFun releases StepAudio 3 ASR at 1.7% WER on the AA-WER Index

Artificial Analysis says StepFun’s StepAudio 3 ASR is available through the StepFun API for non-streaming transcription, scoring 1.7% WER on the AA-WER Index, tied with Alibaba’s Fun-Realtime-ASR-preview and down from 4.7% for StepAudio 2.5 ASR. It transcribes at 88x real time and costs $0.40 per hour.

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.

StepFun open-sources terminal coding agent Step Code v0.1.0

Step Code v0.1.0 is an MIT-licensed CLI agent that reads and edits code, runs tests, and ships from one command line. StepFun reports 80.9% on Terminal-Bench 2.1 and 73.3% on Multi-Frame, its 150-task benchmark, and includes one-command publishing with StepPage.

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.

elvis: StepFun Step 5 Preview matched GLM 5.3 on two real coding tasks

elvis (@omarsar0) says he early-tested StepFun’s new Step 5 Preview as a coding agent. He reports that it and GLM 5.3 both solved two real repository tasks with no fix rounds, that Step 5 Preview stopped after checking its work, and that it found five hidden clues in a ~368K-token long-context test.