diff --git a/packages/opencode/src/auth/index.ts b/packages/opencode/src/auth/index.ts
index ef9846a375e..98e151f2c5c 100644
--- a/packages/opencode/src/auth/index.ts
+++ b/packages/opencode/src/auth/index.ts
@@ -17,6 +17,7 @@ export namespace Auth {
     .object({
       type: z.literal("api"),
       key: z.string(),
+      customBaseUrl: z.string().optional(),
     })
     .meta({ ref: "ApiAuth" })
 
diff --git a/packages/opencode/src/cli/cmd/auth.ts b/packages/opencode/src/cli/cmd/auth.ts
index 382232f5ace..09ec964c3bf 100644
--- a/packages/opencode/src/cli/cmd/auth.ts
+++ b/packages/opencode/src/cli/cmd/auth.ts
@@ -253,6 +253,22 @@ export const AuthLoginCommand = cmd({
         prompts.log.info("You can create an api key at https://vercel.link/ai-gateway-token")
       }
 
+      let customBaseUrl: string | undefined
+      if (provider === "cloudflare-workers-ai") {
+        if (!providers[provider].api) {
+          UI.error("Cloudflare API URL not found")
+          return
+        }
+
+        const accountIdInput = await prompts.text({
+          message: "Enter your Cloudflare Account ID",
+          validate: (x) => (x && x.length > 0 ? undefined : "Required"),
+        })
+        if (prompts.isCancel(accountIdInput)) throw new UI.CancelledError()
+
+        customBaseUrl = providers[provider].api?.replace("{CLOUDFLARE_ACCOUNT_ID}", accountIdInput)
+      }
+
       const key = await prompts.password({
         message: "Enter your API key",
         validate: (x) => (x && x.length > 0 ? undefined : "Required"),
@@ -261,6 +277,7 @@ export const AuthLoginCommand = cmd({
       await Auth.set(provider, {
         type: "api",
         key,
+        ...(customBaseUrl && { customBaseUrl }),
       })
 
       prompts.outro("Done")
diff --git a/packages/opencode/src/provider/provider.ts b/packages/opencode/src/provider/provider.ts
index 2d30a738ae2..5ca80736e4d 100644
--- a/packages/opencode/src/provider/provider.ts
+++ b/packages/opencode/src/provider/provider.ts
@@ -18,7 +18,7 @@ export namespace Provider {
 
   type CustomLoader = (
     provider: ModelsDev.Provider,
-    api?: string,
+    auth?: Auth.Info,
   ) => Promise<{
     autoload: boolean
     getModel?: (sdk: any, modelID: string) => Promise<any>
@@ -143,6 +143,18 @@ export namespace Provider {
         },
       }
     },
+    "cloudflare-workers-ai": async (_provider, auth) => {
+      if (!auth || auth.type !== "api" || !auth.customBaseUrl) {
+        return { autoload: false, options: {} }
+      }
+
+      return {
+        autoload: true,
+        options: {
+          baseURL: auth.customBaseUrl,
+        },
+      }
+    },
   }
 
   const state = Instance.state(async () => {
@@ -256,18 +268,23 @@ export namespace Provider {
       )
     }
 
-    // load apikeys
+    // load apikeys and customBaseUrl
     for (const [providerID, provider] of Object.entries(await Auth.all())) {
       if (disabled.has(providerID)) continue
       if (provider.type === "api") {
-        mergeProvider(providerID, { apiKey: provider.key }, "api")
+        const options: Record<string, any> = { apiKey: provider.key }
+        if (provider.customBaseUrl) {
+          options["baseURL"] = provider.customBaseUrl
+        }
+        mergeProvider(providerID, options, "api")
       }
     }
 
     // load custom
     for (const [providerID, fn] of Object.entries(CUSTOM_LOADERS)) {
       if (disabled.has(providerID)) continue
-      const result = await fn(database[providerID])
+      const auth = await Auth.get(providerID)
+      const result = await fn(database[providerID], auth)
       if (result && (result.autoload || providers[providerID])) {
         mergeProvider(providerID, result.options ?? {}, "custom", result.getModel)
       }