Kiln

AI Coding Tools

A free desktop app and open‑source Python library for building, evaluating, optimizing, and deploying AI workflows.

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Python Latest v1.0.2 · 23d ago Security brief →

Features

Cross‑platform desktop app for Mac, Windows and Linux with one‑click install
Eval Builder to auto‑generate evaluation datasets and align results quickly
Auto‑Optimize that automatically tunes prompts, models, tools and parameters
Git‑native collaboration letting non‑technical team members rate outputs and add data
Open Python library (MIT) for deploying agents built in the app

Recent releases

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v1.0.2 New feature 23d

Synthetic data guides + new models

Open

v0.28.0 New feature 1mo

Notable features

Kiln Chat assistant for AI system optimization
Automatic Git Sync for parallel team editing
Library support for streaming responses

Full changelog

Kiln Chat and Automatic Git Sync

What's New

Kiln Chat: A new chat/assistant panel in the app. Just ask, and Kiln can help you build and optimize any AI system. The assistant can help across all areas of Kiln, including RAG, Tools, Fine-tuning, Evals, Specs, Optimization, and more.
Automatic Git Sync: Team collaboration has never been easier. Kiln automatically syncs your project over Git so your whole team can make edits in parallel. No command line needed — a simple UI setup flow, then just use the app for instant syncing.
New Models: Kimi K2.6, GLM 5.1, Gemma 4, Opus 4.7, Qwen 3.6, MiniMax M2.7, Mistral Small 4, and many more.
And More: Library support for streaming responses, bug fixes, easier signup, and much more.

CI Build Source for this release Mac and Linux: /Kiln-AI/Kiln/actions/runs/24801094423
CI Build Source for this release Windows: /Kiln-AI/Kiln/actions/runs/24801094468

Full Changelog: https://github.com/Kiln-AI/Kiln/compare/v0.26.0...v0.28.0

View release on GitHub

v0.26.0 Breaking risk 2mo

Notable features

Agent Skills standard support for progressive information disclosure
Thinking level selection for reasoning models

Full changelog

Agent Skills Support

What's New

Skills: Support for the open Agent Skills standard. Skills allow progressive disclosure of additional information to your agent -- a great middle ground between context loading and RAG.
Thinking Level for Reasoning Models: You can now select the thinking level for reasoning models that support multiple levels. See the "Advanced" section of the Run screen.
New Models: GPT 5.4, GPT 5.3 Instant, Qwen 3.5 variants
And More: Improved error UI, SDK improvements (runs are no longer saved by default), deprecated models hidden in UI, improved fine-tuning for tool use

CI Build Source for this release Mac and Linux: /Kiln-AI/Kiln/actions/runs/23250506105
CI Build Source for this release Windows: /Kiln-AI/Kiln/actions/runs/23250506230

Full Changelog: https://github.com/Kiln-AI/Kiln/compare/v0.25.0...v0.26.0

View release on GitHub

v0.25.0 New feature 3mo

Notable features

Kiln Automatic Prompt Optimizer for automated prompt engineering
Optimizer Screen for selecting optimization methods
MCP Run Configurations to integrate external implementations

Full changelog

Automatic Prompt Optimizer & Run Kiln Evals on MCP Servers

What's New

Kiln Automatic Prompt Optimizer: our new state-of-the-art prompt optimizer. We automatically finds high-performing prompts for your task. It often beats manual prompt engineering by double-digit gains on evals. Instead of human trial-and-error, Kiln will run thousands of automated experiments and iteratively find an optimal prompt for a given model and task.
Optimizer Screen: Our new menu for finding the best way to optimize your task. Pick from options like prompt optimization, model selection, fine-tuning and more.
MCP Run Configurations: hook a Kiln task up to any external implementation through MCP. This allows you to use Kiln's evals, specs and compare features with your own custom agent implementations.
New Models: Gemini 3.1 Pro, Sonnet 4.6, GLM 5, Kimi K2.5, Minimax M2.5, Qwen 3.5, and many more!
And More: Better app layout/design, featured models, model suggestions, model pricing, and more!

CI Build Source for this release Mac and Linux: /Kiln-AI/Kiln/actions/runs/22231831533
CI Build Source for this release Windows: /Kiln-AI/Kiln/actions/runs/22231831526

Full Changelog: https://github.com/Kiln-AI/Kiln/compare/v0.24.0...v0.25.0

View release on GitHub

v0.24.0 New feature 4mo

Notable features

Tool Use Fine Tuning for model-specific tool training
Compare Task Configs with interactive charts
Deploy Kiln Tasks via CLI to custom servers

Full changelog

Kiln Copilot, Specifications, Fine-tuning for Tools and More!

What's New

Specs & Kiln Copilot: our new agentic system for building better evals. It works interactively with you to refine and improve your evals with synthetic data generation, edge case discovery, judge prompt discovery, and more!
Tool Use Fine Tuning: Train models to use specific tools, with examples
Compare Task Configs: new interactive charts to find the best model and prompt for your task using evals
Deploy Kiln Tasks: we have a new CLI and instructions for deploying tasks you create inside of the Kiln app to your own server or API
New Models: Gemini 3 Pro & Flash, Opus 4.5, GLM 4.6V and 4.7, GPT 5.2, and many more
And More: bug fixes, better keyboard navigation, UI improvements, faster tool calling

CI Build Source for this release Mac and Linux: /Kiln-AI/Kiln/actions/runs/21444555657
CI Build Source for this release Windows: /Kiln-AI/Kiln/actions/runs/21444555635

Full Changelog: https://github.com/Kiln-AI/Kiln/compare/v0.23.0...v0.24.0

View release on GitHub

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