diff --git a/src/config/zod-schema.core.ts b/src/config/zod-schema.core.ts
index df330b88901..70396b3109e 100644
--- a/src/config/zod-schema.core.ts
+++ b/src/config/zod-schema.core.ts
@@ -182,6 +182,7 @@ export const SecretsConfigSchema = z
 export const ModelApiSchema = z.union([
   z.literal("openai-completions"),
   z.literal("openai-responses"),
+  z.literal("openai-codex-responses"),
   z.literal("anthropic-messages"),
   z.literal("google-generative-ai"),
   z.literal("github-copilot"),