Kiln V1.0 🎉

After 6,562 commits — Kiln is hitting v1.0!

Unlike most releases, V1 isn't about a pile of new features. It's a mark of stability and robustness. APIs have been battle tested, core flows verified.

What is Kiln?

Kiln is the AI workbench for teams — everything you need to build and optimize AI systems, in one app and one open-source library:

• Build — RAG, Tools & MCP, Skills, Sub-Agents, structured output, reasoning, prompt generators
• Evaluate — LLM-as-Judge evals, AI Eval Builder, golden datasets, human ratings
• Improve — Auto-Optimize prompts against your evals, fine-tuning, synthetic data generation
• Collaborate — Git Auto-Sync, in-app feedback & ratings, MIT-licensed Python library
• Run anywhere — 190+ models tested across every major provider, cloud or fully local

Friendly app for the whole team (PMs, SMEs, data scientists). MIT-licensed Python library (3.10+) for production. Same project files, no lock-in.

Thanks

To every contributor, every issue reporter, every Discord member, and everyone who starred the repo — this release belongs to you. Onwards.

What's New in V1.0

• Synthetic Data Guides: Guides help you generate more complex synthetic data. Kiln will help you build a data-guide covering structure, tone, guidelines, and rules.
• New Models: GPT-5.5 , DeepSeek V4 Pro and Flash, Gemini Embedding 2
• And More: visual design updates, UX polish, bug fixes, and more

CI Build Source for this release Mac and Linux: /Kiln-AI/Kiln/actions/runs/25699347547 CI Build Source for this release Windows: /Kiln-AI/Kiln/actions/runs/25699347566

Full Changelog: https://github.com/Kiln-AI/Kiln/compare/v0.28.0...v1.0.2