Changelog

Highlights

• Dynamic metadata and OG images for chat pages.

• Playground to create and compare model runs.

• Dual gateway support: LLM Gateway and Vercel AI Gateway.

• Monorepo migration to Turborepo for faster builds and shared tooling.

Changes

feat: enhance chat title management and metadata generation

• Removed unused webpack configuration in next.config.js.

• Updated build script in package.json to include shadcn build.

• Dynamic metadata for chat pages with OG and Twitter cards.

• New API route for dynamic OG image generation.

• ChatTitleSyncer component to sync chat titles with cookies.

• ChatTitlesCookieManager utility for cookie management.

• Local chat storage now syncs titles on create, update, delete.

• History dialog and section ensure titles are consistently synced.

• Layout and page refactor to use new metadata and OG image generation.

feat: implement playground feature with new components and API integration

• Playground to create and manage experiments for AI models.

• API routes for creating playgrounds and fetching messages.

• Playground and PlaygroundColumn UI components.

• Sidebar and layout integration for playground management.

• package.json and bun.lock updated for new deps.

• Database schema extended for playground entities and messages.

• Chat components refactored for playground interactions and UX.

feat: enhance chat message handling with partsJson support

• Optional partsJson field in message schema and DB to store full parts including reasoning and tool calls.

• addMessage mutation handles partsJson.

• Message provider serializes and deserializes partsJson.

• Playground config adds maximum column controls and UI wiring.

• Components refactored for the new data path and UX.

feat: integrate AI Gateway support and enhance playground functionality

• Support for Vercel AI Gateway alongside LLM Gateway in the model selector.

• Playground schema and components accept selected gateway source.

• Chat input and message handling include gateway specific options.

• API routes and local storage updated for user keys and settings.

• Max playground columns increased from 10 to 30.

feat: add gateway support for chat and playground functionalities

• Optional gateway field in message and playground schemas: llm-gateway or vercel-ai-gateway.

• addMessage and addPlaygroundMessage handle the gateway parameter.

• MessagesProvider and CacheProvider include gateway in state.

• Components sync gateway settings from local storage for flexibility.

• Deprecated message-list removed.

feat: enhance API key management and model selection in chat and playground

• Both gateway API keys supported in ChatInput, ModelSelector, and PlaygroundColumn.

• State tracks presence of keys and updates UI hints and disabled states.

• Key loading reacts to changes for better sync across components.

chore(repo): migrate to Turborepo and move Next.js app to apps/www

• Root workspaces and turbo.json for build, check, check:unsafe, check-types, dev.

• App moved to apps/www including src, public, convex, and Next or PostCSS or Basehub configs.

• Added packages/tsconfig/base.json and made apps/www/tsconfig.json extend it.

• Simplified apps/www/tsconfig.json and added @/convex/* path alias.

• Fixed Framer Motion Transition typing in file-list.tsx.

• Added root dev:all and upgraded turbo to ^2.5.5.

• Added SCRIPTS.md with turbo usage, filter semantics, and dev commands.

• Updated .gitignore for monorepo outputs and .turbo.

• Updated biome.jsonc ignores for new paths.

• Note: build env vars now live under apps/www/.env*.

• Swapped out legacy theme files for a Tweakcn‑based system (includes flash‑prevent script and theme utilities)

• Updated settings dialog to import/reset Tweakcn themes

• Added react-tweet and YouTube MDX components for richer docs

• Switched Next.js build to Turbopack and installed react-tweet

• Refreshed sidebar, chat UI, and global.css to use new theme variables and shadcn layout

• Applied consistent formatting and naming across files (imports, whitespace, objects/arrays)

• Introduced BaseHub auto‑generated types, refactored sidebar/chat components, and removed unused controls

Major Refactoring & Cleanup

• Removed hCaptcha, PostHog, settings and boards routes to slim down to an experimental playground

• Built a new modular sidebar under src/components/app-sidebar

• Simplified BYOK API‑key management (local or Convex) and added dedicated key/settings components

• Updated README and .env.example for the pared‑down setup

• Introduced Fumadocs for structured changelog tracking

• Refactored chat UI: removed unused modules (message‑versions, regenerate‑dropdown), cleaned up sidebar and history

• Focusing now on a fast, non‑logged‑in user flow and an AI model testing platform vision

Acknowledgments
Thanks to @theo, @Ibelick, @r_marked, @t3dotchat for inspiration and guidance.

This version represents a significant shift in the project's direction, moving from a general-purpose chat application to a specialized experimental platform for AI model testing and comparison.

ChaiChat is a Next.js 15/T3‑stack chat platform for real‑time AI streaming (GPT‑4o, Gemini Flash, Claude) with instant sync, offline support, and anonymous, rate‑limited access.

• Stream AI responses in real time with resumable connections

• Instant sync and offline caching via Convex and Dexie

• Anonymous access protected by hCaptcha rate limits

• Media uploads, shareable links, dark and light themes, keyboard shortcuts

• Built with strict TypeScript, Tailwind CSS, and Framer Motion

• Edge‑optimized on Vercel with secure API‑key management and error boundaries