diff --git a/packages/opencode/src/cli/cmd/tui/app.tsx b/packages/opencode/src/cli/cmd/tui/app.tsx
index fee65414e..7ed198382 100644
--- a/packages/opencode/src/cli/cmd/tui/app.tsx
+++ b/packages/opencode/src/cli/cmd/tui/app.tsx
@@ -29,6 +29,66 @@ import { Session as SessionApi } from "@/session"
 import { TuiEvent } from "./event"
 import { KVProvider, useKV } from "./context/kv"
 
+async function getTerminalBackgroundColor(): Promise<"dark" | "light"> {
+  return new Promise((resolve) => {
+    let timeout: NodeJS.Timeout
+
+    const cleanup = () => {
+      process.stdin.setRawMode(false)
+      process.stdin.removeListener("data", handler)
+      clearTimeout(timeout)
+    }
+
+    const handler = (data: Buffer) => {
+      const str = data.toString()
+      const match = str.match(/\x1b]11;([^\x07]+)\x07/)
+      if (match) {
+        cleanup()
+        const color = match[1]
+        console.log(color)
+
+        // Parse RGB values from color string
+        // Formats: rgb:RR/GG/BB or #RRGGBB or rgb(R,G,B)
+        let r = 0,
+          g = 0,
+          b = 0
+
+        if (color.startsWith("rgb:")) {
+          const parts = color.substring(4).split("/")
+          r = parseInt(parts[0], 16) >> 8 // Convert 16-bit to 8-bit
+          g = parseInt(parts[1], 16) >> 8 // Convert 16-bit to 8-bit
+          b = parseInt(parts[2], 16) >> 8 // Convert 16-bit to 8-bit
+        } else if (color.startsWith("#")) {
+          r = parseInt(color.substring(1, 3), 16)
+          g = parseInt(color.substring(3, 5), 16)
+          b = parseInt(color.substring(5, 7), 16)
+        } else if (color.startsWith("rgb(")) {
+          const parts = color.substring(4, color.length - 1).split(",")
+          r = parseInt(parts[0])
+          g = parseInt(parts[1])
+          b = parseInt(parts[2])
+        }
+        console.log(r, g, b)
+
+        // Calculate luminance using relative luminance formula
+        const luminance = (0.299 * r + 0.587 * g + 0.114 * b) / 255
+
+        // Determine if dark or light based on luminance threshold
+        resolve(luminance > 0.5 ? "light" : "dark")
+      }
+    }
+
+    process.stdin.setRawMode(true)
+    process.stdin.on("data", handler)
+    process.stdout.write("\x1b]11;?\x07")
+
+    timeout = setTimeout(() => {
+      cleanup()
+      resolve("dark")
+    }, 1000)
+  })
+}
+
 export function tui(input: {
   url: string
   sessionID?: string
@@ -38,7 +98,10 @@ export function tui(input: {
   onExit?: () => Promise<void>
 }) {
   // promise to prevent immediate exit
-  return new Promise<void>((resolve) => {
+  return new Promise<void>(async (resolve) => {
+    const backgroundTheme = await getTerminalBackgroundColor()
+    console.log("Terminal background theme:", backgroundTheme)
+
     const routeData: Route | undefined = input.sessionID
       ? {
           type: "session",
@@ -66,7 +129,11 @@ export function tui(input: {
                     <SDKProvider url={input.url}>
                       <SyncProvider>
                         <ThemeProvider>
-                          <LocalProvider initialModel={input.model} initialAgent={input.agent} initialPrompt={input.prompt}>
+                          <LocalProvider
+                            initialModel={input.model}
+                            initialAgent={input.agent}
+                            initialPrompt={input.prompt}
+                          >
                             <KeybindProvider>
                               <DialogProvider>
                                 <CommandProvider>
@@ -251,7 +318,7 @@ function App() {
       value: "app.exit",
       onSelect: exit,
       category: "System",
-    }
+    },
   ])
 
   createEffect(() => {