Configurable thinking budget (default to medium) (#494)

src/ipc/utils/thinking_utils.ts

@@ -1,16 +1,37 @@
 import { PROVIDERS_THAT_SUPPORT_THINKING } from "../shared/language_model_helpers";
+import type { UserSettings } from "../../lib/schemas";
+
+function getThinkingBudgetTokens(
+  thinkingBudget?: "low" | "medium" | "high",
+): number {
+  switch (thinkingBudget) {
+    case "low":
+      return 1_000;
+    case "medium":
+      return 4_000;
+    case "high":
+      return -1;
+    default:
+      return 4_000; // Default to medium
+  }
+}
 
 export function getExtraProviderOptions(
   providerId: string | undefined,
+  settings: UserSettings,
 ): Record<string, any> {
   if (!providerId) {
     return {};
   }
   if (PROVIDERS_THAT_SUPPORT_THINKING.includes(providerId)) {
+    const budgetTokens = getThinkingBudgetTokens(settings?.thinkingBudget);
     return {
       thinking: {
         type: "enabled",
         include_thoughts: true,
+        // -1 means dynamic thinking where model determines.
+        // budget_tokens: 128, // minimum for Gemini Pro is 128
+        budget_tokens: budgetTokens,
       },
     };
   }