Make usdPerMToken a pricing utility

src/backend/drivers/ai-chat/providers/minimax/models.ts

@@ -18,9 +18,8 @@
  */
 
 import type { IChatModel } from '../../types.js';
+import { usdPerMToken } from '../../utils/pricing.js';
 
-const CENTS_PER_USD = 100;
-const MTOK = 1_000_000;
 const CONTEXT_WINDOW = 204_800;
 const MAX_OUTPUT_TOKENS = 196_608;
 
@@ -28,17 +27,6 @@ type MiniMaxChatModel = IChatModel & {
     apiModel: string;
 };
 
-const usdPerMToken = (
-    inputUsd: number,
-    outputUsd: number,
-    cachedReadUsd = 0,
-) => ({
-    tokens: MTOK,
-    prompt_tokens: inputUsd * CENTS_PER_USD,
-    completion_tokens: outputUsd * CENTS_PER_USD,
-    cached_tokens: cachedReadUsd * CENTS_PER_USD,
-});
-
 const minimaxModel = (
     apiModel: string,
     name: string,

src/backend/drivers/ai-chat/providers/zai/models.ts

@@ -18,22 +18,10 @@
  */
 
 import type { IChatModel } from '../../types.js';
+import { usdPerMToken } from '../../utils/pricing.js';
 
-const CENTS_PER_USD = 100;
-const MTOK = 1_000_000;
 const K = 1_000;
 
-const usdPerMToken = (
-    inputUsd: number,
-    outputUsd: number,
-    cachedInputUsd = 0,
-) => ({
-    tokens: MTOK,
-    prompt_tokens: inputUsd * CENTS_PER_USD,
-    completion_tokens: outputUsd * CENTS_PER_USD,
-    cached_tokens: cachedInputUsd * CENTS_PER_USD,
-});
-
 const textModel = (
     id: string,
     name: string,

src/backend/drivers/ai-chat/utils/pricing.ts

@@ -0,0 +1,40 @@
+/**
+ * Copyright (C) 2024-present Puter Technologies Inc.
+ *
+ * This file is part of Puter.
+ *
+ * Puter is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+import type { ModelCost } from '../types.js';
+
+const CENTS_PER_USD = 100;
+const MTOK = 1_000_000;
+
+/**
+ * Builds a `costs` block (currency `usd-cents`, per million tokens) from
+ * per-million-token USD prices. Providers list pricing in USD/MTok, so this
+ * keeps the source numbers readable while emitting the cents-based shape the
+ * driver expects.
+ */
+export const usdPerMToken = (
+    inputUsd: number,
+    outputUsd: number,
+    cachedReadUsd = 0,
+): ModelCost => ({
+    tokens: MTOK,
+    prompt_tokens: inputUsd * CENTS_PER_USD,
+    completion_tokens: outputUsd * CENTS_PER_USD,
+    cached_tokens: cachedReadUsd * CENTS_PER_USD,
+});