diff --git a/lua/gp/dispatcher.lua b/lua/gp/dispatcher.lua
index d4214aa8..62587db4 100644
--- a/lua/gp/dispatcher.lua
+++ b/lua/gp/dispatcher.lua
@@ -190,6 +190,13 @@ D.prepare_payload = function(messages, model, provider)
 		output.top_p = nil
 	end
 
+	if model.model == "gpt-5" or  model.model == "gpt-5-mini" then
+		-- remove max_tokens, top_p, temperature for gpt-5 models (duh)
+		output.max_tokens = nil
+		output.temperature = nil
+		output.top_p = nil
+	end
+
 	return output
 end