From 9818cd5ab916ee47c53f745b913b11a37bfcd7a0 Mon Sep 17 00:00:00 2001
From: "tobias@tobias-weiss.org" <tobias@tobias-weiss.org>
Date: Sat, 11 Apr 2026 07:45:55 +0200
Subject: [PATCH] feat(provider): add LiteLLM provider support

Add litellm entry to the custom() provider map. Uses the bundled
@ai-sdk/openai-compatible SDK with user-configured baseURL. Supports
LITELLM_API_KEY env var and apiKey in provider options. Autoloads when
baseURL is configured in opencode.json under provider.litellm.
---
 packages/opencode/src/provider/provider.ts | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/packages/opencode/src/provider/provider.ts b/packages/opencode/src/provider/provider.ts
index e401a067c716..625cd8ff30d4 100644
--- a/packages/opencode/src/provider/provider.ts
+++ b/packages/opencode/src/provider/provider.ts
@@ -815,6 +815,27 @@ export namespace Provider {
             },
           },
         }),
+      litellm: Effect.fnUntraced(function* (input: Info) {
+        const providerConfig = (yield* dep.config()).provider?.["litellm"]
+        const apiKey = Env.get("LITELLM_API_KEY")
+        const baseURL = providerConfig?.options?.baseURL ?? providerConfig?.api
+
+        if (!baseURL) {
+          return { autoload: false }
+        }
+
+        const options: Record<string, any> = { baseURL }
+        if (apiKey) options.apiKey = apiKey
+        else if (providerConfig?.options?.apiKey) options.apiKey = providerConfig.options.apiKey
+
+        return {
+          autoload: true,
+          options,
+          async getModel(sdk: any, modelID: string) {
+            return sdk.languageModel(modelID)
+          },
+        }
+      }),
     }
   }