diff --git a/packages/opencode/src/session/llm.ts b/packages/opencode/src/session/llm.ts
index 9cd40f30221..8e9964bcbb3 100644
--- a/packages/opencode/src/session/llm.ts
+++ b/packages/opencode/src/session/llm.ts
@@ -219,7 +219,13 @@ export namespace LLM {
           extractReasoningMiddleware({ tagName: "think", startWithReasoning: false }),
         ],
       }),
-      experimental_telemetry: { isEnabled: cfg.experimental?.openTelemetry },
+      experimental_telemetry: {
+        isEnabled: cfg.experimental?.openTelemetry,
+        metadata: {
+          userId: cfg.username ?? "unknown",
+          sessionId: input.sessionID,
+        },
+      },
     })
   }