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Built with
Fable 5NEWModerate
The page credits Claude Code as the foundation; Claude Code by Anthropic is powered by the Claude 3.5/Fable series, with current project references (e.g. the 2026 timeline and agentic workflows) mapping to the Fable 5 capability set.The project is explicitly designed as a skill extension for Claude Code, which utilizes Claude models; 'Fable 5' is the current model ID associated with the advanced coding capabilities requested for this tooling.
Build evidence
Strong
This is a prominent, well-documented open-source repository maintained by Garry Tan, with extensive code, documentation, and a clear setup process for real-world usage.
Shipped
2h ago · model from Jun 9, 2026GStack transforms Claude Code into a complete virtual engineering team by adding specialist AI agents for CEO review, design feedback, QA, security, and release management. It provides a structured, command-based process that orchestrates the entire software sprint lifecycle, ensuring consistency and velocity across projects.
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