diff --git a/plugins/openai/src/index.ts b/plugins/openai/src/index.ts
index a7cdee1e..3192c87a 100644
--- a/plugins/openai/src/index.ts
+++ b/plugins/openai/src/index.ts
@@ -36,6 +36,8 @@ import {
 } from './gpt.js';
 import { SUPPORTED_TTS_MODELS, ttsModel, tts1, tts1Hd } from './tts.js';
 import { whisper1, whisper1Model } from './whisper.js';
+import { ModelAction } from '@genkit-ai/ai/model';
+import z from 'zod';
 export {
   dallE3,
   gpt35Turbo,
@@ -52,8 +54,12 @@ export {
   textEmbeddingAda002,
 };
 
+export type OpenAICustomModelAction = <CustomOptionsSchema extends z.ZodTypeAny = z.ZodTypeAny>(client: OpenAI) => ModelAction<CustomOptionsSchema>
+
 export interface PluginOptions {
   apiKey?: string;
+  baseURL?: string;
+  customModels?: Array<OpenAICustomModelAction>;
 }
 
 /**
@@ -106,7 +112,8 @@ export const openAI: Plugin<[PluginOptions] | []> = genkitPlugin(
       throw new Error(
         'please pass in the API key or set the OPENAI_API_KEY environment variable'
       );
-    const client = new OpenAI({ apiKey });
+    const baseURL = options?.baseURL || process.env.OPENAI_BASE_URL;
+    const client = new OpenAI({ apiKey, baseURL });
     return {
       models: [
         ...Object.keys(SUPPORTED_GPT_MODELS).map((name) =>
@@ -117,6 +124,7 @@ export const openAI: Plugin<[PluginOptions] | []> = genkitPlugin(
         ),
         dallE3Model(client),
         whisper1Model(client),
+        ...(options?.customModels?.map(model => model(client)) || []),
       ],
       embedders: Object.keys(SUPPORTED_EMBEDDING_MODELS).map((name) =>
         openaiEmbedder(name, options)