diff --git a/lua/gemini/api.lua b/lua/gemini/api.lua
index 731f178..05f8efb 100644
--- a/lua/gemini/api.lua
+++ b/lua/gemini/api.lua
@@ -87,13 +87,21 @@ function M.get_response(prompt, context, callback)
 		return
 	end
 
-	local payload = vim.json.encode({contents = contents})
+	local payload = vim.json.encode({
+		contents = contents,
+		generationConfig = {
+			temperature = 0.1,
+			topK = 1,
+			topP = 1,
+			maxOutputTokens = 2048,
+		}
+	})
 	
+	-- Correctly format the URL with model and API key
 	local url = string.format(
-		config.options.api_url .. "?key=%s",
-		config.options.model,
-		api_key
-	)
+		config.options.api_url,
+		config.options.model
+	) .. "?key=" .. api_key
 
 	local request = http.Request.new(url, payload)
 	request:execute(function(result, error)