diff --git a/open-sse/providers/registry/claude.js b/open-sse/providers/registry/claude.js
index 428e66ad..d0bc9302 100644
--- a/open-sse/providers/registry/claude.js
+++ b/open-sse/providers/registry/claude.js
@@ -57,6 +57,7 @@ export default {
     },
   },
   models: [
+    { id: "claude-opus-5-5", name: "Claude Opus 5.5" },
     { id: "claude-opus-5", name: "Claude Opus 5" },
     { id: "claude-fable-5-1", name: "Claude Fable 5.1" },
     { id: "claude-fable-5", name: "Claude Fable 5" },
diff --git a/open-sse/providers/shared.js b/open-sse/providers/shared.js
index c0699c6f..176c82e9 100644
--- a/open-sse/providers/shared.js
+++ b/open-sse/providers/shared.js
@@ -22,7 +22,7 @@ export function mapStainlessArch() {
 
 // Anthropic API version (single source — reused across claude-format providers/executors)
 export const ANTHROPIC_API_VERSION = "2023-06-01";
-export const CLAUDE_CLI_VERSION = "2.1.258";
+export const CLAUDE_CLI_VERSION = "2.1.280";
 
 // Shared Claude-compatible API headers (reused across claude-format providers)
 export const CLAUDE_API_HEADERS = {