Jesse Vincent's Superpowers 6 Cuts AI Coding Costs 60% After Overnight Fable Experiments
Superpowers 6 adds Kimi Code support and slashes build costs by 60% using Anthropic's Fable to optimize its own workflow overnight
- Superpowers 6 ships with builds up to 50% faster and token costs cut by up to 60%, driven by AI-optimized workflow changes.
- Kimi Code officially supported -- Moonshot AI's terminal-first coding agent (powered by K2.7 Code, a 1T-parameter MoE model) joins the Superpowers ecosystem.
- Fable optimized Superpowers itself -- Anthropic's Claude Fable 5 ran 25 overnight experiments and independently discovered the same architectural improvements as its human developer.
- Key wins: merging two review agents into one, pre-baking git diff review packets, and conditional model tiering (using cheaper models only when appropriate).
- Autoresearch loop cost ~$165 in tokens and produced savings worth multiples of that across every future build run.
- Eval suite open-sourced at github.com/prime-radiant-inc/superpowers-evals, enabling reproducible benchmarking across all supported harnesses.
Superpowers, the open-source agentic coding workflow framework built by Jesse Vincent, just shipped version 6 -- and the headline numbers are hard to ignore: builds up to 50% faster and token costs cut by up to 60%. The release also officially adds support for Kimi Code, Moonshot AI's terminal-first coding agent, expanding the growing list of platforms Superpowers can plug into.
But the real story here isn't just the new integration. It's how those performance gains were achieved -- by pointing Anthropic's most powerful model, Fable, at Superpowers itself and letting it run experiments overnight.
What Superpowers actually does
Superpowers is an open-source agentic skills framework and software development workflow designed for coding agents such as Claude Code and Codex. The core idea is that AI coding agents, left to their own devices, tend to skip the boring but critical parts of engineering. You ask for a feature, and the agent immediately starts writing code -- no spec, no plan, no tests. Twenty minutes later you have something that looks right and is subtly wrong.
Superpowers fixes this by imposing a mandatory structured workflow on top of whatever coding agent you're using. Skills trigger automatically -- the agent checks the skills library before acting and selects the appropriate skill based on context. The workflow enforces:
- Mandatory RED-GREEN-REFACTOR: write failing test, watch it fail, write minimal code, watch it pass, commit.
- Breaking work into bite-sized tasks of 2-5 minutes each.
- Dual-axis review of every change: did the agent implement exactly what was asked, and is the quality up to standard.
- Creating an isolated workspace on a new branch, running project setup, and verifying a clean test baseline -- before any code is written.
Superpowers is an open-source framework by Jesse Vincent -- a methodology for building coding agents with composable skills that auto-trigger, mandatory TDD, and subagent-driven development. It supports Claude Code, Cursor, Codex, and Gemini CLI. It's MIT-licensed and free to use.