diff --git a/lua/gp/dispatcher.lua b/lua/gp/dispatcher.lua
index d4214aa..5ea18b9 100644
--- a/lua/gp/dispatcher.lua
+++ b/lua/gp/dispatcher.lua
@@ -172,6 +172,7 @@ D.prepare_payload = function(messages, model, provider)
 		max_tokens = model.max_tokens or 4096,
 		temperature = math.max(0, math.min(2, model.temperature or 1)),
 		top_p = math.max(0, math.min(1, model.top_p or 1)),
+		reasoning_format = model.reasoning_format,
 	}
 
 	if (provider == "openai" or provider == "copilot") and model.model:sub(1, 1) == "o" then