# castform (ChatGPT Plugin)

> post-train llms with castform.

- Type: plugin
- Publisher: castform (official)
- Categories: Development, AI & ML
- Website: https://chatgpt.com/plugins/plugins_6a84a979b5a081918922e037047514b5
- Open in ChatGPT: https://chatgpt.com/plugins/plugins_6a84a979b5a081918922e037047514b5
- Version: 1.0.0+codex.20260818184934
- Listed: 2026-10-15

## About

design, validate, launch, and monitor castform post-training runs from codex.

## Install

1. **Add it in ChatGPT** Open Plugins in the ChatGPT sidebar (web or desktop), search for “castform” and select +. You'll be asked to sign in to any connected service on first use. Then type @ in a chat to call it.

## Skills

- **design-environment**: Design a benchmax environment, its ordered dataset, tools, and explicit reward shape for a Castform project.
- **generate-data**: Prepare, clean, generate, or reference the data used by a Castform environment from project-owned Python scripts.
- **launch-run**: Review, bundle, upload, and explicitly launch a Castform GPU training run from the project script.
- **setup**: One-time bootstrap for a new Castform project — install the Castform CLI and scaffold the Codex guide, skills, and starter environment. Run this before any other Castform skill.
- **train-sft**: Build a validated benchmax-sft-v1 dataset from existing labeled conversations, upload it, and explicitly launch a supervised finetuning run — no environment, rewards, or rollouts.
- **verify-environment**: Run and inspect the script-owned local two-sibling validation before spending GPU credits.
- **view-progress**: Monitor a Castform run with status, scalar, rollout, and log commands, then diagnose failures or reward drift.

## Example prompts

- "Set up this project for Castform."
- "Help me design a Castform environment."
- "Validate and launch my Castform run."

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Source: https://chatgptplugins.directory/plugins/castform · Index: https://chatgptplugins.directory/llms.txt · Independent and community-run. Not affiliated with or endorsed by OpenAI. ChatGPT is a trademark of OpenAI.