From 0bd0af311a60d98e333a5ce37a1174e55840a1c0 Mon Sep 17 00:00:00 2001
From: Yuhan Lei <lei.yuhan@outlook.com>
Date: Mon, 18 May 2026 21:21:08 +0800
Subject: [PATCH] fix(provider): widen Kimi anthropic-SDK thinking match to
 K2.x

Cherry-pick from upstream anomalyco/opencode #23696 (commit 58232d896,
2026-04-21). Without this, Kimi for Coding K2.6 (k2p6) on the Anthropic
SDK path never gets `thinking` enabled, the request is rejected by
Moonshot's coding endpoint, and the user is stuck in a 10-attempt retry
loop showing "The engine is currently overloaded, please try again later".

Root cause:
- `kimi-for-coding` uses `@ai-sdk/anthropic` but Kimi is not an Anthropic
  model. Moonshot's coding endpoint requires `thinking: enabled` on K2.x
  reasoning models or it returns a misleading overload-style error.
- The existing transform only matched K2.5 ids (`k2p5`, `kimi-k2.5`,
  `kimi-k2p5`). K2.6 (`k2p6`) had no transform and went out unmodified.

Change boundary:
- transform.ts: substring match widened from `k2p5` -> `k2p` and from
  `kimi-k2.5` -> `kimi-k2.` in two places (variants() and options()).
  Now covers K2.5, K2.6, and future K2.x without further edits.
- transform.test.ts: update the existing "Kimi anthropic thinking" block
  to assert K2.5 and K2.6 both get thinking enabled, while
  `kimi-k2-preview`, `kimi-k2`, and `kimi-k2-thinking` still don't.

Out of scope:
- This PR does not touch the OpenAI-compatible Kimi paths (volcengine
  plan, moonshot.cn, moonshot.ai). Those already have their own
  reasoning_content handling.
---
 packages/opencode/src/provider/transform.ts       | 6 +++---
 packages/opencode/test/provider/transform.test.ts | 8 ++++----
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/packages/opencode/src/provider/transform.ts b/packages/opencode/src/provider/transform.ts
index 779c6bad5..7bfee4869 100644
--- a/packages/opencode/src/provider/transform.ts
+++ b/packages/opencode/src/provider/transform.ts
@@ -683,7 +683,7 @@ export function variants(model: Provider.Model): Record<string, Record<string, a
     id.includes("glm") ||
     (id.includes("mistral") && model.api.npm !== "@ai-sdk/mistral") ||
     id.includes("kimi") ||
-    id.includes("k2p5") ||
+    id.includes("k2p") ||
     id.includes("qwen") ||
     id.includes("big-pickle")
   )
@@ -1154,11 +1154,11 @@ export function options(input: {
     }
   }
 
-  // Enable thinking by default for kimi-k2.5/k2p5 models using anthropic SDK
+  // Enable thinking by default for kimi 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"))
+    (modelId.includes("k2p") || modelId.includes("kimi-k2.") || modelId.includes("kimi-k2p"))
   ) {
     result["thinking"] = {
       type: "enabled",
diff --git a/packages/opencode/test/provider/transform.test.ts b/packages/opencode/test/provider/transform.test.ts
index 929382430..2804820a2 100644
--- a/packages/opencode/test/provider/transform.test.ts
+++ b/packages/opencode/test/provider/transform.test.ts
@@ -479,8 +479,8 @@ describe("ProviderTransform.options - Kimi anthropic thinking", () => {
       headers: {},
     }) as any
 
-  test("enables thinking for the supported Kimi K2.5 anthropic variants", () => {
-    for (const apiId of ["kimi-k2.5", "kimi-k2p5", "k2p5"]) {
+  test("enables thinking for supported Kimi K2.x anthropic variants", () => {
+    for (const apiId of ["kimi-k2.5", "kimi-k2p5", "k2p5", "kimi-k2.6", "kimi-k2p6", "k2p6"]) {
       const result = ProviderTransform.options({
         model: createModel(apiId),
         sessionID,
@@ -493,8 +493,8 @@ describe("ProviderTransform.options - Kimi anthropic thinking", () => {
     }
   })
 
-  test("does not broaden thinking to unrelated Kimi K2 or K2P variants", () => {
-    for (const apiId of ["kimi-k2.6", "kimi-k2-preview", "kimi-k2p6", "k2p6"]) {
+  test("does not enable thinking for Kimi variants that lack a K2 dot or K2P tag", () => {
+    for (const apiId of ["kimi-k2-preview", "kimi-k2", "kimi-k2-thinking"]) {
       const result = ProviderTransform.options({
         model: createModel(apiId),
         sessionID,