chore(vendor): import pi 1.3.0

Imported as a linear vendor commit so forge rebases do not replay the upstream root tree.

git-subtree-dir: third_party/pi

git-subtree-split: 71023aec1546d6d677a65669c5665c0927ce0dd0

third_party/pi/packages/ai/test/model-cost-tiers.test.ts

@@ -0,0 +1,105 @@
+import { describe, expect, it } from "vitest";
+import { getAiGatewayCost } from "../scripts/ai-gateway-pricing.ts";
+import { buildOpenRouterCatalog, type OpenRouterModelListItem } from "../scripts/openrouter-catalog.ts";
+
+function openRouterChatCost(pricing: OpenRouterModelListItem["pricing"]) {
+	const catalog = buildOpenRouterCatalog(
+		[{ id: "anthropic/claude-haiku-5.5", name: "Claude Haiku 5.5", supported_parameters: ["tools"], pricing }],
+		[],
+		[],
+	);
+	return catalog.chat[0]?.cost;
+}
+
+describe("OpenRouter pricing overrides", () => {
+	it("turns prompt-length overrides into tiers", () => {
+		expect(
+			openRouterChatCost({
+				prompt: "0.0000001",
+				completion: "0.0000005",
+				input_cache_read: "0.00000001",
+				input_cache_write: "0.000000125",
+				overrides: [
+					{
+						min_prompt_tokens: 100000,
+						prompt: "0.0000005",
+						completion: "0.0000025",
+						input_cache_read: "0.00000005",
+						input_cache_write: "0.000000625",
+					},
+				],
+			}),
+		).toEqual({
+			input: 0.1,
+			output: 0.5,
+			cacheRead: 0.01,
+			cacheWrite: 0.125,
+			tiers: [{ inputTokensAbove: 100000, input: 0.5, output: 2.5, cacheRead: 0.05, cacheWrite: 0.625 }],
+		});
+	});
+
+	it("keeps base rates missing from an override", () => {
+		expect(
+			openRouterChatCost({
+				prompt: "0.000002",
+				completion: "0.000012",
+				input_cache_read: "0.0000002",
+				input_cache_write: "0.000000375",
+				overrides: [{ min_prompt_tokens: 200000, prompt: "0.000004", completion: "0.000018" }],
+			})?.tiers,
+		).toEqual([{ inputTokensAbove: 200000, input: 4, output: 18, cacheRead: 0.2, cacheWrite: 0.375 }]);
+	});
+
+	it("skips time-of-day overrides", () => {
+		expect(
+			openRouterChatCost({
+				prompt: "0.000000132",
+				completion: "0.000000528",
+				overrides: [
+					{ utc_start: 0, utc_end: 1600, prompt: "0.000000132", completion: "0.000000528" },
+					{ utc_days: ["saturday"], min_prompt_tokens: 1000, prompt: "0.0000001" },
+				],
+			}),
+		).toEqual({ input: 0.132, output: 0.528, cacheRead: 0, cacheWrite: 0 });
+	});
+});
+
+describe("Vercel AI Gateway pricing tiers", () => {
+	it("turns bracket starts into tiers with the rates in effect there", () => {
+		expect(
+			getAiGatewayCost({
+				input: "0.000001",
+				output: "0.000005",
+				input_cache_read: "0.0000002",
+				input_tiers: [
+					{ cost: "0.000001", min: 0, max: 32001 },
+					{ cost: "0.0000018", min: 32001, max: 128001 },
+					{ cost: "0.000003", min: 128001 },
+				],
+				output_tiers: [
+					{ cost: "0.000005", min: 0, max: 32001 },
+					{ cost: "0.000009", min: 32001, max: 128001 },
+					{ cost: "0.000015", min: 128001 },
+				],
+			}),
+		).toEqual({
+			input: 1,
+			output: 5,
+			cacheRead: 0.2,
+			cacheWrite: 0,
+			tiers: [
+				{ inputTokensAbove: 32000, input: 1.8, output: 9, cacheRead: 0.2, cacheWrite: 0 },
+				{ inputTokensAbove: 128000, input: 3, output: 15, cacheRead: 0.2, cacheWrite: 0 },
+			],
+		});
+	});
+
+	it("returns base rates without tiers", () => {
+		expect(getAiGatewayCost({ input: "0.000003", output: 0.000015 })).toEqual({
+			input: 3,
+			output: 15,
+			cacheRead: 0,
+			cacheWrite: 0,
+		});
+	});
+});