fix: ensure kimi-for-coding plan has thinking on by default for k2p5 (#12147)

packages/opencode/src/provider/transform.ts

@@ -630,6 +630,18 @@ export namespace ProviderTransform {
       }
     }
 
+    // Enable thinking by default for kimi-k2.5/k2p5 models using anthropic SDK
+    const modelId = input.model.api.id.toLowerCase()
+    if (
+      (input.model.api.npm === "@ai-sdk/anthropic" || input.model.api.npm === "@ai-sdk/google-vertex/anthropic") &&
+      (modelId.includes("k2p5") || modelId.includes("kimi-k2.5") || modelId.includes("kimi-k2p5"))
+    ) {
+      result["thinking"] = {
+        type: "enabled",
+        budgetTokens: Math.min(16_000, Math.floor(input.model.limit.output / 2 - 1)),
+      }
+    }
+
     if (input.model.api.id.includes("gpt-5") && !input.model.api.id.includes("gpt-5-chat")) {
       if (!input.model.api.id.includes("gpt-5-pro")) {
         result["reasoningEffort"] = "medium"