diff --git a/packages/ai/CHANGELOG.md b/packages/ai/CHANGELOG.md
index 9af07a27..add6f587 100644
--- a/packages/ai/CHANGELOG.md
+++ b/packages/ai/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Added
+
+- Added GPT-5.5 to OpenAI Codex model generation.
+
 ### Fixed
 
 - Fixed `openai-completions` streamed tool-call assembly to coalesce deltas by stable tool index when OpenAI-compatible gateways mutate tool call IDs mid-stream, preventing malformed Kimi K2.6/OpenCode tool streams from splitting one call into multiple bogus tool calls ([#3576](https://github.com/badlogic/pi-mono/issues/3576))
diff --git a/packages/ai/scripts/generate-models.ts b/packages/ai/scripts/generate-models.ts
index 990f8254..abdecf61 100644
--- a/packages/ai/scripts/generate-models.ts
+++ b/packages/ai/scripts/generate-models.ts
@@ -1104,6 +1104,18 @@ async function generateModels() {
 			contextWindow: CODEX_CONTEXT,
 			maxTokens: CODEX_MAX_TOKENS,
 		},
+		{
+			id: "gpt-5.5",
+			name: "GPT-5.5",
+			api: "openai-codex-responses",
+			provider: "openai-codex",
+			baseUrl: CODEX_BASE_URL,
+			reasoning: true,
+			input: ["text", "image"],
+			cost: { input: 5, output: 30, cacheRead: 0.5, cacheWrite: 0 },
+			contextWindow: 400000,
+			maxTokens: CODEX_MAX_TOKENS,
+		},
 		{
 			id: "gpt-5.4-mini",
 			name: "GPT-5.4 Mini",
diff --git a/packages/ai/src/models.generated.ts b/packages/ai/src/models.generated.ts
index aa790498..1ac19938 100644
--- a/packages/ai/src/models.generated.ts
+++ b/packages/ai/src/models.generated.ts
@@ -6521,6 +6521,23 @@ export const MODELS = {
 			contextWindow: 272000,
 			maxTokens: 128000,
 		} satisfies Model<"openai-codex-responses">,
+		"gpt-5.5": {
+			id: "gpt-5.5",
+			name: "GPT-5.5",
+			api: "openai-codex-responses",
+			provider: "openai-codex",
+			baseUrl: "https://chatgpt.com/backend-api",
+			reasoning: true,
+			input: ["text", "image"],
+			cost: {
+				input: 5,
+				output: 30,
+				cacheRead: 0.5,
+				cacheWrite: 0,
+			},
+			contextWindow: 400000,
+			maxTokens: 128000,
+		} satisfies Model<"openai-codex-responses">,
 	},
 	"opencode": {
 		"big-pickle": {