diff --git a/packages/contracts/src/model.ts b/packages/contracts/src/model.ts
index 126f0fbc6ae97fe45294788d825dd25da34a5f1b..fa07d3e92fbe23326503224603142abf2b40c710 100644
--- a/packages/contracts/src/model.ts
+++ b/packages/contracts/src/model.ts
@@ -1,10 +1,17 @@
-export const MODEL_OPTIONS = ["gpt-5.3-codex", "gpt-5.2-codex", "gpt-5.2"] as const;
+export const MODEL_OPTIONS = [
+  "gpt-5.3-codex",
+  "gpt-5.3-codex-spark",
+  "gpt-5.2-codex",
+  "gpt-5.2",
+] as const;
 
 export const DEFAULT_MODEL = "gpt-5.3-codex";
 
 export const MODEL_SLUG_ALIASES: Record<string, string> = {
   "5.3": "gpt-5.3-codex",
   "gpt-5.3": "gpt-5.3-codex",
+  "5.3-spark": "gpt-5.3-codex-spark",
+  "gpt-5.3-spark": "gpt-5.3-codex-spark",
 };
 
 export function normalizeModelSlug(model: string | null | undefined): string | null {