diff --git a/open-sse/config/providerModels.js b/open-sse/config/providerModels.js
index b3502b97..2fa9818a 100644
--- a/open-sse/config/providerModels.js
+++ b/open-sse/config/providerModels.js
@@ -83,6 +83,7 @@ export const PROVIDER_MODELS = {
     { id: "gpt-5.1-codex-max", name: "GPT-5.1 Codex Max" },
     { id: "gpt-5.2", name: "GPT-5.2" },
     { id: "gpt-5.2-codex", name: "GPT-5.2 Codex" },
+    { id: "gpt-5.3-codex", name: "GPT-5.3 Codex" },
     // GitHub Copilot - Anthropic models
     { id: "claude-haiku-4.5", name: "Claude Haiku 4.5" },
     { id: "claude-opus-4.1", name: "Claude Opus 4.1" },
diff --git a/src/shared/constants/pricing.js b/src/shared/constants/pricing.js
index 937b2d5b..7338dff3 100644
--- a/src/shared/constants/pricing.js
+++ b/src/shared/constants/pricing.js
@@ -458,6 +458,13 @@ export const DEFAULT_PRICING = {
       reasoning: 30.00,
       cache_creation: 5.00
     },
+    "gpt-5.3-codex": {
+      input: 1.75,
+      output: 14.00,
+      cached: 0.175,
+      reasoning: 14.00,
+      cache_creation: 1.75
+    },
     "claude-haiku-4.5": {
       input: 0.50,
       output: 2.50,