diff --git a/src/openai-realtime.ts b/src/openai-realtime.ts
index 464cc08..9a13288 100644
--- a/src/openai-realtime.ts
+++ b/src/openai-realtime.ts
@@ -61,22 +61,22 @@ export class OpenAIRealtimeAdapter implements MultimodalAdapter {
 			? `${this.config.apiKey.slice(0, 7)}...${this.config.apiKey.slice(-4)} (${this.config.apiKey.length} chars)`
 			: "(empty)";
 		console.log(dim(`[voice] API key: ${keyPreview}`));
-		const sessionResp = await fetch("https://api.openai.com/v1/realtime/sessions", {
+		const sessionResp = await fetch("https://api.openai.com/v1/realtime/client_secrets", {
 			method: "POST",
 			headers: {
 				"Authorization": `Bearer ${this.config.apiKey}`,
 				"Content-Type": "application/json",
 			},
-			body: JSON.stringify({ model }),
+			body: JSON.stringify({ session: { type: "realtime", model } }),
 		});
 		if (!sessionResp.ok) {
 			const body = await sessionResp.text();
 			throw new Error(`Failed to create realtime session: ${sessionResp.status} ${body}`);
 		}
-		const session = await sessionResp.json() as { client_secret?: { value?: string } };
-		const ephemeralKey = session.client_secret?.value;
+		const session = await sessionResp.json() as { value?: string };
+		const ephemeralKey = session.value;
 		if (!ephemeralKey) {
-			throw new Error("No ephemeral key returned from realtime sessions endpoint");
+			throw new Error("No ephemeral key returned from realtime client_secrets endpoint");
 		}
 
 		await this.connectWs(url, {
@@ -298,14 +298,14 @@ export class OpenAIRealtimeAdapter implements MultimodalAdapter {
 				const msg = err?.message || "";
 				if (!msg.includes("authentication") && !msg.includes("401")) throw err;
 				// Ephemeral token fallback (matches connect() path)
-				const sessionResp = await fetch("https://api.openai.com/v1/realtime/sessions", {
+				const sessionResp = await fetch("https://api.openai.com/v1/realtime/client_secrets", {
 					method: "POST",
 					headers: { Authorization: `Bearer ${this.config.apiKey}`, "Content-Type": "application/json" },
-					body: JSON.stringify({ model }),
+					body: JSON.stringify({ session: { type: "realtime", model } }),
 				});
 				if (!sessionResp.ok) throw new Error(`refresh ephemeral token: ${sessionResp.status}`);
-				const session = (await sessionResp.json()) as { client_secret?: { value?: string } };
-				const ephemeralKey = session.client_secret?.value;
+				const session = (await sessionResp.json()) as { value?: string };
+				const ephemeralKey = session.value;
 				if (!ephemeralKey) throw new Error("No ephemeral key on refresh");
 				await this.connectWs(url, {
 				});