Chat
Everyday conversation with Claude's chat harness, markdown, code blocks and visible reasoning.
streams direct
v1.23.9 · Windows · local first
Claude's harnesses. Any OpenCode model
OpenClaude is a local chat and agent app for OpenCode. Claude's own system prompts, agents, skills, commands and output styles guide whichever model you pick. All it needs is an OpenCode Console key.
5surfaces, each with its own Claude harness
0Anthropic keys required
65themes plus a three-colour custom builder
62backdrops, with optional liquid glass
One app. Five ways to work.
Each surface in the top bar applies a harness from the local prompt library. Code and Cowork run on the OpenCode agent runtime; the others stream straight from the model.
Code
A coding agent that reads, edits and runs commands in your workspace, with tool cards for every step.
opencode runtimeCowork
Hand off multi-step tasks on your files. Shell and edit actions ask before they run.
opencode runtimeDesign
A design-minded harness for palettes, layouts and interface ideas.
streams directArtifacts
HTML and SVG results open as live artifacts, served under a CSP sandbox.
sandboxedLocal first. Built to be trusted.
Your sessions, settings and keys stay on your machine. The agent runtime is isolated, connectors are yours to choose, and artifacts can't reach anything they shouldn't.
An isolated agent runtime
OpenClaude starts its own opencode serve with separate config and a dedicated workspace, proxied at /rt/*. Claude agents, skills and commands are converted for OpenCode, and Claude tool names map to OpenCode's.
# the app, from source
bun start # http://127.0.0.1:3000
Just an OpenCode key
An existing OpenCode Console key on your machine is picked up automatically. Otherwise paste one; it is checked against /zen and /inference.
Models from every key
Models are combined across keys. Each chat goes to a key that lists the chosen model first, then fails over to the rest.
MCP connectors
Add MCP servers from presets or your own config in the Connect tab. OpenClaude also registers a connector that searches and reads your past sessions.
Sandboxed artifacts
HTML and SVG blocks are served at /artifact/:id under a CSP sandbox, so they cannot read your key or sessions.
Your data, on disk
Sessions live in a local SQLite database. Settings are mirrored to a local file so a cleared browser keeps your look. API keys are never mirrored.
Liquid glass, for real
An optional WebGL renderer refracts the backdrop inside every glass panel: rounded-rect lenses, chromatic dispersion, Fresnel and specular rims. Without WebGL it falls back to SVG filters.
Motion
Springs, not easing curves.
OpenClaude uses SwiftUI's spring(duration:bounce:) maths: stiffness is (2π / duration)², damping is 1 − bounce. Each curve is generated live as a CSS linear() easing. Try the four motion modes from the app.
Liquid glasstap to feel the spring
65 themes. Pick one and the page follows.
Every theme is three colours; the rest is derived. Tap any of these 37 to re-skin this page, the same way the app does.
hover to pause · your pick is remembered
Running in three steps.
- 1
Install
Run
OpenClaude-Setup-1.23.9.exe. It can set up the WebView2 runtime and fetch OpenCode from npm if they're missing. - 2
Connect a key
The setup guide finds an OpenCode Console key already on your machine, or lets you paste one. No Anthropic key needed.
- 3
Pick a surface
Chat, Code, Cowork, Design or Artifacts. Choose a model and start. Code and Cowork need
opencodeon your PATH.
Questions, answered.
What is OpenClaude?
OpenClaude is a local web chat and agent app for OpenCode. It applies Claude's own harnesses (system prompts, agents, skills, commands and output styles) to any OpenCode model, across five surfaces: Chat, Code, Cowork, Design and Artifacts.
Do I need an Anthropic API key?
No. OpenClaude only needs an OpenCode Console key. If OpenCode already has one on your machine, in the OPENCODE_API_KEY variable or in OpenCode's auth.json, it is used automatically with no prompt.
Which models can I use?
Any model your OpenCode keys list. OpenClaude reads the models from each key and combines them. A chat is routed to a key that lists the chosen model first, then falls back to the rest.
Where is my data stored?
On your machine. Sessions, settings and usage live in a data folder next to the app. API keys are never mirrored into the settings file, and artifacts run in a sandbox that cannot read your key or sessions.
What do the Code and Cowork surfaces need?
The opencode CLI on your PATH. Code and Cowork run on an isolated opencode serve instance that OpenClaude starts for you. Shell commands and file edits ask for your permission by default.
Which platforms are supported?
The packaged app is for Windows 10 and 11 on x64. The installer can set up the WebView2 runtime and fetch OpenCode from npm, then opens a three-step setup guide. A portable folder build is also produced.
Can I change how it looks?
Yes. There are 65 themes plus a custom builder, 62 backdrops, optional liquid glass, fonts, density, corners and four motion modes: Jelly, Smooth, Snappy and Off. Your look is applied before first paint.
Is OpenClaude affiliated with Anthropic or OpenCode?
No. OpenClaude is an independent project. It is not made, endorsed or supported by Anthropic or by the OpenCode project.
Bring Claude's harnesses to your models.
Download the Windows installer, connect your OpenCode key and pick a surface.
Windows 10 / 11x64≈144 MBinstaller + portable