diff --git a/mateclaw-server/src/main/java/vip/mate/llm/model/ModelInfoDTO.java b/mateclaw-server/src/main/java/vip/mate/llm/model/ModelInfoDTO.java
index e840068c..18013199 100644
--- a/mateclaw-server/src/main/java/vip/mate/llm/model/ModelInfoDTO.java
+++ b/mateclaw-server/src/main/java/vip/mate/llm/model/ModelInfoDTO.java
@@ -23,21 +23,42 @@ public class ModelInfoDTO {
     private String probeError;
 
     /**
-     * RFC-049 PR-1-UI: whether this model's {@code ModelFamily} accepts the
-     * {@code reasoning_effort} parameter. Derived from the model name on the
-     * server side so the frontend can gray out the "thinking depth" selector
-     * for chat-type models that don't support thinking — a product contract,
-     * not a runtime toggle.
-     *
-     * <p>{@code true} only for the OpenAI reasoning family (gpt-5*, o1*, o3*, o4*).
+     * RFC-049 PR-1-UI (narrow): whether this model's {@code ModelFamily} accepts the
+     * OpenAI {@code reasoning_effort} parameter specifically. True <em>only</em> for
+     * the OpenAI reasoning family (gpt-5, o1, o3, o4 variants). Retained for callers
+     * that need to know parameter-level compatibility; the UI "deep thinking" toggle
+     * should use {@link #supportsThinking} instead.
      */
     private boolean supportsReasoningEffort;
 
+    /**
+     * RFC-049 PR-1-UI (broad): whether this model supports <em>any</em> form of
+     * deep thinking — either OpenAI-style via {@code reasoning_effort}, provider-
+     * native (Kimi K2.x, DeepSeek-Reasoner, qwen-thinking), or Anthropic extended
+     * thinking (Claude family). This is what the UI "deep thinking" toggle reads.
+     *
+     * <p>Derived from the model name so every construction site stays consistent.
+     */
+    private boolean supportsThinking;
+
     public ModelInfoDTO(String id, String name) {
         this.id = id;
         this.name = name;
-        // RFC-049 PR-1-UI: derived from id (the model name) so every construction
-        // site populates the capability consistently.
         this.supportsReasoningEffort = ModelFamily.detect(id).supportsReasoningEffort();
+        this.supportsThinking = computeSupportsThinking(id);
+    }
+
+    /**
+     * Thinking capability at the product level (what the UI toggle should reflect):
+     * any model family that has a thinking mode, regardless of how it is triggered
+     * (parameter vs. model-native vs. Anthropic extended thinking).
+     */
+    private static boolean computeSupportsThinking(String modelName) {
+        if (modelName == null || modelName.isBlank()) return false;
+        ModelFamily family = ModelFamily.detect(modelName);
+        if (family.isThinking()) return true;  // OPENAI_REASONING / KIMI_THINKING / DEEPSEEK_REASONER / GENERIC_THINKING
+        // Anthropic Claude supports extended thinking via AnthropicChatOptions.thinking;
+        // ModelFamily doesn't model non-OpenAI-compatible providers so match by name.
+        return modelName.toLowerCase().contains("claude");
     }
 }
diff --git a/mateclaw-ui/src/types/index.ts b/mateclaw-ui/src/types/index.ts
index 6b1e0607..0e0896b7 100644
--- a/mateclaw-ui/src/types/index.ts
+++ b/mateclaw-ui/src/types/index.ts
@@ -587,13 +587,17 @@ export interface ProviderModelInfo {
   /** Short error message when probeOk=false */
   probeError?: string
   /**
-   * RFC-049 PR-1-UI: whether the model's `ModelFamily` accepts the
-   * `reasoning_effort` parameter. Derived server-side from the model name;
-   * true only for the OpenAI reasoning family (gpt-5, o1, o3, o4 variants).
-   * Used by the thinking-depth selector to gray itself out on non-reasoning
-   * models.
+   * RFC-049 PR-1-UI (narrow): whether the model accepts the OpenAI
+   * `reasoning_effort` parameter. True only for OpenAI reasoning family.
    */
   supportsReasoningEffort?: boolean
+  /**
+   * RFC-049 PR-1-UI (broad): whether the model supports any form of deep
+   * thinking (OpenAI reasoning_effort, Kimi/DeepSeek native thinking,
+   * Anthropic extended thinking). This is the field the UI "thinking depth"
+   * toggle should gate on.
+   */
+  supportsThinking?: boolean
 }
 
 export interface ProviderInfo {
diff --git a/mateclaw-ui/src/views/ChatConsole.vue b/mateclaw-ui/src/views/ChatConsole.vue
index 548b7494..7120e658 100644
--- a/mateclaw-ui/src/views/ChatConsole.vue
+++ b/mateclaw-ui/src/views/ChatConsole.vue
@@ -252,7 +252,7 @@
         @deny="handleDeny"
         :enable-talk-mode="!!selectedAgentId"
         :thinking-enabled="thinkingEnabled"
-        :thinking-supported="currentModelSupportsReasoningEffort"
+        :thinking-supported="currentModelSupportsThinking"
         @toggle-thinking="thinkingEnabled = !thinkingEnabled"
         @talk="showTalkMode = true"
       />
@@ -637,15 +637,17 @@ const currentRuntimeModel = computed(() => {
 })
 
 /**
- * RFC-049 PR-1-UI: whether the active runtime model supports `reasoning_effort`.
- * Drives the enable/disable state of the thinking-depth toggle in ChatInput:
- * chat-type models that don't support thinking must not honor the "deep thinking"
- * selection (product contract — UI reflects the backend gate).
+ * RFC-049 PR-1-UI: whether the active runtime model supports <em>any</em> form
+ * of deep thinking (OpenAI reasoning_effort / Kimi native / DeepSeek-Reasoner
+ * native / Anthropic extended thinking). Drives the enable/disable state of
+ * the thinking-depth toggle in ChatInput.
  *
- * Source of truth: ProviderModelInfo.supportsReasoningEffort (set by backend via
- * ModelFamily.detect(modelName) in ModelInfoDTO).
+ * Reads the broad capability (`supportsThinking`) from ProviderModelInfo,
+ * populated server-side in ModelInfoDTO. The narrow `supportsReasoningEffort`
+ * only covers OpenAI gpt-5/o1/o3/o4 and would wrongly gray out Kimi K2.x,
+ * DeepSeek-Reasoner, and Claude — all of which legitimately support thinking.
  */
-const currentModelSupportsReasoningEffort = computed<boolean>(() => {
+const currentModelSupportsThinking = computed<boolean>(() => {
   const providerId = activeModels.value?.activeLlm?.providerId
   const modelName = activeModels.value?.activeLlm?.model
   if (!providerId || !modelName) return false
@@ -653,7 +655,7 @@ const currentModelSupportsReasoningEffort = computed<boolean>(() => {
   if (!provider) return false
   const all = [...(provider.models || []), ...(provider.extraModels || [])]
   const hit = all.find((m) => m.id === modelName || m.name === modelName)
-  return Boolean(hit?.supportsReasoningEffort)
+  return Boolean(hit?.supportsThinking)
 })
 
 const userInitial = computed(() => (localStorage.getItem('username') || 'U').charAt(0).toUpperCase())