diff --git a/.changeset/update-claude-model-specs.md b/.changeset/update-claude-model-specs.md
new file mode 100644
index 00000000..460f7405
--- /dev/null
+++ b/.changeset/update-claude-model-specs.md
@@ -0,0 +1,5 @@
+---
+"perstack": patch
+---
+
+feat: add claude-sonnet-4-6, update claude-opus-4-6 context window to 1M, update claude-haiku-4-5 max output to 64k, add MiniMax M2.5