diff --git a/pkg/providers/openai_compat/provider.go b/pkg/providers/openai_compat/provider.go
index ff9109e96..697e58a23 100644
--- a/pkg/providers/openai_compat/provider.go
+++ b/pkg/providers/openai_compat/provider.go
@@ -157,7 +157,8 @@ func (p *Provider) Chat(
 	// Prompt caching is only supported by OpenAI-native endpoints.
 	// Gemini and other providers reject unknown fields, so skip for non-OpenAI APIs.
 	if cacheKey, ok := options["prompt_cache_key"].(string); ok && cacheKey != "" {
-		if !strings.Contains(p.apiBase, "generativelanguage.googleapis.com") {
+		if !strings.Contains(p.apiBase, "generativelanguage.googleapis.com") &&
+		   !strings.Contains(p.apiBase, "api.groq.com")  {
 			requestBody["prompt_cache_key"] = cacheKey
 		}
 	}