strongly typed realtime model enum

Author: janligudzinski

src/realtime/types.rs

@@ -26,6 +26,24 @@ pub struct Session {
     pub max_output_tokens: Option<MaxOutputTokens>,
 }
 
+#[derive(Debug, Serialize, Deserialize, Clone)]
+pub enum RealtimeModel {
+    #[serde(rename = "gpt-realtime")]
+    GptRealtime,
+    #[serde(rename = "gpt-4o-realtime-preview")]
+    Gpt4oRealtimePreview,
+    #[serde(rename = "gpt-4o-mini-realtime-preview")]
+    Gpt4oMiniRealtimePreview,
+    #[serde(rename = "gpt-realtime-2025-08-28")]
+    GptRealtime20250828,
+    #[serde(rename = "gpt-4o-realtime-preview-2024-12-17")]
+    Gpt4oRealtimePreview20241217,
+    #[serde(rename = "gpt-4o-realtime-preview-2024-10-01")]
+    Gpt4oRealtimePreview20241001,
+    #[serde(rename = "gpt-4o-mini-realtime-preview-2024-12-17")]
+    Gpt4oMiniRealtimePreview20241217,
+}
+
 #[derive(Debug, Serialize, Deserialize, Clone)]
 #[serde(rename_all = "lowercase")]
 pub enum RealtimeVoice {

src/v1/realtime_calls.rs

@@ -1,14 +1,25 @@
 use serde::{Deserialize, Serialize};
 
+use crate::realtime::types::RealtimeModel;
+
 /// Used to start a realtime session based on an incoming call that you can then connect to over WSS with `RealtimeSipClient` from `openai_api_rs::realtime::sip`.
 /// Note that this is poorly documented by OpenAI with the only example data given in https://platform.openai.com/docs/guides/realtime-sip#handle-the-webhook and these may not be all the possible fields.
 #[derive(Debug, Serialize, Deserialize, Clone)]
 pub struct AcceptCallRequest {
-    /// This is *always* `realtime`.
+    /// This is *always* `realtime`. Convenience constructor exposed to ensure this.
     #[serde(rename = "type")]
     pub session_type: String,
     pub instructions: String,
-    pub model: String,
+    pub model: RealtimeModel,
+}
+impl AcceptCallRequest {
+    pub fn new(instructions: String, model: RealtimeModel) -> Self {
+        Self {
+            session_type: "realtime".to_string(),
+            instructions,
+            model,
+        }
+    }
 }
 
 /// Used to redirect a call to another number. Per https://platform.openai.com/docs/guides/realtime-sip#handle-the-webhook the Tel-URI scheme may be used.