chore: Update CHANGELOG.md and feed.xml

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## 2.1.156
+
+- Fixed an issue when using Opus 4.8 where thinking blocks were modified, leading to API errors.
+
 ## 2.1.154
 
 - Opus 4.8 is here! Now defaults to high effort · /effort xhigh for your hardest tasks

feed.xml

@@ -6,7 +6,14 @@
   <author><name>Anthropic</name></author>
   <link rel="alternate" type="text/html" href="https://github.com/anthropics/claude-code/blob/main/CHANGELOG.md"/>
   <link rel="self" type="application/atom+xml" href="https://raw.githubusercontent.com/anthropics/claude-code/main/feed.xml"/>
-  <updated>2026-05-28T18:00:47Z</updated>
+  <updated>2026-05-29T01:42:17Z</updated>
+  <entry>
+    <id>https://github.com/anthropics/claude-code/releases/tag/v2.1.156</id>
+    <title>Claude Code v2.1.156</title>
+    <link rel="alternate" type="text/html" href="https://github.com/anthropics/claude-code/releases/tag/v2.1.156"/>
+    <updated>2026-05-29T01:42:17Z</updated>
+    <content type="html">&lt;p&gt;• Fixed an issue when using Opus 4.8 where thinking blocks were modified, leading to API errors.&lt;/p&gt;</content>
+  </entry>
   <entry>
     <id>https://github.com/anthropics/claude-code/releases/tag/v2.1.154</id>
     <title>Claude Code v2.1.154</title>
@@ -645,12 +652,4 @@
 &lt;p&gt;• Updated the /tui fullscreen startup banner to describe additional renderer benefits (lower memory usage, mouse support, auto-copy on select)&lt;/p&gt;
 &lt;p&gt;• Fixed Bedrock and Vertex 400 errors when ENABLE_PROMPT_CACHING_1H is set&lt;/p&gt;</content>
   </entry>
-  <entry>
-    <id>https://github.com/anthropics/claude-code/releases/tag/v2.1.131</id>
-    <title>Claude Code v2.1.131</title>
-    <link rel="alternate" type="text/html" href="https://github.com/anthropics/claude-code/releases/tag/v2.1.131"/>
-    <updated>2026-05-18T01:52:01Z</updated>
-    <content type="html">&lt;p&gt;• Fixed VS Code extension failing to activate on Windows due to a hardcoded build path in the bundled SDK (createRequire polyfill bug)&lt;/p&gt;
-&lt;p&gt;• Fixed Mantle endpoint authentication failing with missing x-api-key header&lt;/p&gt;</content>
-  </entry>
 </feed>