diff --git a/openai/init.moon b/openai/init.moon
index 072242d..32d98f8 100644
--- a/openai/init.moon
+++ b/openai/init.moon
@@ -7,8 +7,6 @@ unpack = table.unpack or unpack
 
 import types from require "tableshape"
 
-parse_url = require("socket.url").parse
-
 empty = (types.nil + types.literal(cjson.null))\describe "nullable"
 
 content_format = types.string + types.array_of types.one_of {
@@ -264,8 +262,6 @@ class OpenAI
     assert test_messages messages
 
     payload = {
-      model: "gpt-3.5-turbo"
-      temperature: 0.5
       :messages
     }
 
@@ -282,13 +278,7 @@ class OpenAI
   -- opts: additional parameters as described in https://platform.openai.com/docs/api-reference/completions
   completion: (prompt, opts) =>
     payload = {
-      model: "text-davinci-003"
       :prompt
-      temperature: 0.5
-      max_tokens: 600
-      -- top_p: 1
-      -- frequency_penalty: 0
-      -- presence_penalty: 0
     }
 
     if opts
@@ -372,7 +362,6 @@ class OpenAI
       cjson.encode payload
 
     headers = {
-      "Host": parse_url(@api_base).host
       "Accept": "application/json"
       "Content-Type": "application/json"
       "Content-Length": body and #body or nil