diff --git a/packages/opencode/src/cli/cmd/tui/app.tsx b/packages/opencode/src/cli/cmd/tui/app.tsx
index 5b7f52253..8f3b47a39 100644
--- a/packages/opencode/src/cli/cmd/tui/app.tsx
+++ b/packages/opencode/src/cli/cmd/tui/app.tsx
@@ -5,6 +5,7 @@ import { RouteProvider, useRoute } from "@tui/context/route"
 import { Switch, Match, createEffect, untrack, ErrorBoundary, createSignal, onMount, batch, Show, on } from "solid-js"
 import { Installation } from "@/installation"
 import { Global } from "@/global"
+import { Flag } from "@/flag/flag"
 import { DialogProvider, useDialog } from "@tui/ui/dialog"
 import { DialogProvider as DialogProviderList } from "@tui/component/dialog-provider"
 import { SDKProvider, useSDK } from "@tui/context/sdk"
@@ -460,6 +461,10 @@ function App() {
       height={dimensions().height}
       backgroundColor={theme.background}
       onMouseUp={async () => {
+        if (Flag.OPENCODE_EXPERIMENTAL_DISABLE_COPY_ON_SELECT) {
+          renderer.clearSelection()
+          return
+        }
         const text = renderer.getSelection()?.getSelectedText()
         if (text && text.length > 0) {
           const base64 = Buffer.from(text).toString("base64")
diff --git a/packages/opencode/src/flag/flag.ts b/packages/opencode/src/flag/flag.ts
index 4edbd5ace..9a3d0437b 100644
--- a/packages/opencode/src/flag/flag.ts
+++ b/packages/opencode/src/flag/flag.ts
@@ -17,6 +17,7 @@ export namespace Flag {
   // Experimental
   export const OPENCODE_EXPERIMENTAL = truthy("OPENCODE_EXPERIMENTAL")
   export const OPENCODE_EXPERIMENTAL_WATCHER = OPENCODE_EXPERIMENTAL || truthy("OPENCODE_EXPERIMENTAL_WATCHER")
+  export const OPENCODE_EXPERIMENTAL_DISABLE_COPY_ON_SELECT = truthy("OPENCODE_EXPERIMENTAL_DISABLE_COPY_ON_SELECT")
 
   function truthy(key: string) {
     const value = process.env[key]?.toLowerCase()