diff --git a/bun.lockb b/bun.lockb
index a1e2534..2cafe94 100755
Binary files a/bun.lockb and b/bun.lockb differ
diff --git a/package.json b/package.json
index 8550066..792141c 100644
--- a/package.json
+++ b/package.json
@@ -92,6 +92,7 @@
     "mobx": "^6.13.1",
     "npm-check-updates": "^17.1.1",
     "npm-sort": "^0.0.4",
+    "openai": "^4.57.3",
     "tsup": "^8.2.4",
     "tsx": "^4.19.0",
     "typescript": "^5.5.4"
diff --git a/src/Layers/OpenAIClient.ts b/src/Layers/OpenAIClient.ts
new file mode 100644
index 0000000..cfab980
--- /dev/null
+++ b/src/Layers/OpenAIClient.ts
@@ -0,0 +1,68 @@
+import { Config, Context, Effect, Layer } from "effect"
+import type { OpenAI } from "openai"
+
+
+export class OpenAIClient extends Context.Tag("OpenAIClient")<OpenAIClient, OpenAIClientService>() {}
+
+export class OpenAIClientService {
+    constructor(
+        readonly openai: Effect.Effect.Success<typeof importOpenAI>,
+        readonly client: OpenAI,
+    ) {}
+
+    try<A>(
+        try_: (
+            client: OpenAI,
+            signal: AbortSignal,
+        ) => Promise<A>
+    ) {
+        return Effect.tryPromise({
+            try: signal => try_(this.client, signal),
+            catch: e => e instanceof this.openai.OpenAIError
+                ? e
+                : new Error(`Unknown OpenAIClient error: ${ e }`),
+        })
+    }
+}
+
+
+const importOpenAI = Effect.tryPromise({
+    try: () => import("openai"),
+    catch: cause => new Error("Could not import 'openai'. Make sure it is installed.", { cause }),
+})
+
+export const OpenAIClientLive = (
+    config: {
+        readonly apiKey:           Config.Config<string>
+        readonly organization?:    Config.Config<string | undefined>
+        readonly project?:         Config.Config<string | undefined>
+        readonly baseURL?:         Config.Config<string | undefined>
+        readonly timeout?:         Config.Config<number | undefined>
+        readonly maxRetries?:      Config.Config<number | undefined>
+
+        readonly httpAgent?:       any
+        readonly fetch?:           any
+        readonly defaultHeaders?:  { [x: string]: string }
+        readonly defaultQuery?:    { [x: string]: string }
+    }
+) => Layer.effect(OpenAIClient, Effect.gen(function*() {
+    const openai = yield* importOpenAI
+
+    return new OpenAIClientService(
+        openai,
+
+        new openai.OpenAI({
+            apiKey:          yield* config.apiKey,
+            organization:    (yield* config.organization || Config.succeed(undefined)) || null,
+            project:         (yield* config.project || Config.succeed(undefined)) || null,
+            baseURL:         (yield* config.baseURL || Config.succeed(undefined)) || "https://api.openai.com/v1",
+            timeout:         yield* config.timeout || Config.succeed(undefined),
+            maxRetries:      yield* config.maxRetries || Config.succeed(undefined),
+
+            httpAgent:       config.httpAgent,
+            fetch:           config.fetch,
+            defaultHeaders:  config.defaultHeaders,
+            defaultQuery:    config.defaultQuery,
+        }),
+    )
+}))
diff --git a/src/Layers/index.ts b/src/Layers/index.ts
index 6a72a2d..2f143bb 100644
--- a/src/Layers/index.ts
+++ b/src/Layers/index.ts
@@ -1,2 +1,3 @@
 export * from "./express"
 export * as JSONWebToken from "./JSONWebToken"
+export * as OpenAIClient from "./OpenAIClient"