Source details
- Original source
- MarkTechPost
- Published
- 2026-10-17
- Primary topic
- Developer Tools
Why it matters
Coding copilots, APIs, SDKs, open-source releases, dev workflows, and engineering infrastructure. Use the original source for the full report, then use the directory shortcuts below to compare the products and workflows the story points toward.
What happened
StepFun has released Step 5 Preview as open weights. FP8 and BF16 checkpoints are live on Hugging Face and ModelScope. Step 5 Preview is a sparse Mixture-of-Experts model from StepFun built for long-horizon agentic work. It has 600B total parameters, 27B active per token and up to 1M tokens of context. For developers, this is […] The post StepFun Releases Step 5 Preview Open Weights: 600B MoE, 27B Active, 1M Context appeared first on MarkTechPost .
What to do next
Jump to coding tools and tutorials to see whether the release changes real implementation speed, reliability, or cost.
StepFun has released Step 5 Preview as open weights. FP8 and BF16 checkpoints are live on Hugging Face and ModelScope. Step 5 Preview is a sparse Mixture-of-Experts model from StepFun built for long-horizon agentic work. It has 600B total parameters, 27B active per token and up to 1M tokens of context. For developers, this is […] The post StepFun Releases Step 5 Preview Open Weights: 600B MoE, 27B Active, 1M Context appeared first on MarkTechPost .
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