# Step 5 Preview: what I've logged

> Step 5 Preview comes up in 2 posts of my AI log, from September 2026 to October 2026, and each item below links to the primary source. The sources come from StepFun, filed under open weights, agents and coding and frontier.

## Items

1. **Step 5 Preview** (StepFun, 14 Oct 2026): A 600B mixture-of-experts model with 27B active parameters and up to 1M context, aimed at agentic software engineering and finance work, with FP8 and BF16 checkpoints. [Primary source](https://huggingface.co/stepfun-ai/Step-5-Preview) · [Post](https://heyaliasif.com/ai/2026-10-15-jais-3-step-5-ling-drama-3#item-2)
2. **Step 5 Preview** (StepFun, 14 Sept 2026): A 600B mixture-of-experts model with 27B active parameters and a 1M-token window, aimed at agentic software and finance work. [Primary source](https://www.stepfun.com/step-5-preview) · [Post](https://heyaliasif.com/ai/2026-09-14-week-in-ai#item-2)

## Posts

- 2026-10-15 [Jais 3 goes open, Step 5 and Ling 3.1 land, Drama 3 speaks](https://heyaliasif.com/ai/2026-10-15-jais-3-step-5-ling-drama-3)
- 2026-09-14 [Gemini 3.8 Live, open Qwen-Image-2.1 and Anthropic's Accenture pact](https://heyaliasif.com/ai/2026-09-14-week-in-ai)

Canonical: https://heyaliasif.com/ai/topics/step-5-preview