Align GPT-5.5 Codex capability handling (#3618)

* fix(ai): align gpt-5.5 codex capabilities

* chore(ai): update generated models

* fix(ai): apply gpt-5.5 priority pricing to api

---------

Co-authored-by: Mario Zechner <badlogicgames@gmail.com>

packages/ai/test/openai-responses-copilot-provider.test.ts

@@ -137,4 +137,49 @@ describe("openai-responses provider defaults", () => {
 
 		expect(captured).toEqual({ sessionId: null, clientRequestId: null });
 	});
+
+	it.each([
+		["gpt-5.4", "priority", 2],
+		["gpt-5.5", "priority", 2.5],
+		["gpt-5.5", "flex", 0.5],
+	] as const)("applies %s %s service-tier cost multiplier", async (modelId, serviceTier, multiplier) => {
+		const model = getModel("openai", modelId);
+		const sse = `${[
+			`data: ${JSON.stringify({
+				type: "response.completed",
+				response: {
+					status: "completed",
+					service_tier: serviceTier,
+					usage: {
+						input_tokens: 1000000,
+						output_tokens: 1000000,
+						total_tokens: 2000000,
+						input_tokens_details: { cached_tokens: 0 },
+					},
+				},
+			})}`,
+		].join("\n\n")}\n\n`;
+
+		vi.spyOn(globalThis, "fetch").mockResolvedValue(
+			new Response(sse, {
+				status: 200,
+				headers: { "content-type": "text/event-stream" },
+			}),
+		);
+
+		const stream = streamOpenAIResponses(
+			model,
+			{
+				systemPrompt: "sys",
+				messages: [{ role: "user", content: "hi", timestamp: Date.now() }],
+			},
+			{ apiKey: "test-key", serviceTier },
+		);
+
+		const result = await stream.result();
+
+		expect(result.usage.cost.input).toBe(model.cost.input * multiplier);
+		expect(result.usage.cost.output).toBe(model.cost.output * multiplier);
+		expect(result.usage.cost.total).toBe((model.cost.input + model.cost.output) * multiplier);
+	});
 });