diff --git a/chat.go b/chat.go
index c8a3e81b..806ebfd5 100644
--- a/chat.go
+++ b/chat.go
@@ -272,7 +272,7 @@ type ChatCompletionRequest struct {
 	// Controls effort on reasoning for reasoning models. It can be set to "low", "medium", or "high".
 	ReasoningEffort string `json:"reasoning_effort,omitempty"`
 	// Metadata to store with the completion.
-	Metadata map[string]string `json:"metadata,omitempty"`
+	Metadata map[string]any `json:"metadata,omitempty"`
 	// Configuration for a predicted output.
 	Prediction *Prediction `json:"prediction,omitempty"`
 	// ChatTemplateKwargs provides a way to add non-standard parameters to the request body.