diff --git a/lua/CopilotChat/copilot.lua b/lua/CopilotChat/copilot.lua
index 1f1bd18f..bd389ec1 100644
--- a/lua/CopilotChat/copilot.lua
+++ b/lua/CopilotChat/copilot.lua
@@ -33,6 +33,7 @@ local curl = require('plenary.curl')
 local utils = require('CopilotChat.utils')
 local class = utils.class
 local join = utils.join
+local temp_file = utils.temp_file
 local prompts = require('CopilotChat.prompts')
 local tiktoken = require('CopilotChat.tiktoken')
 local max_tokens = 8192
@@ -370,12 +371,10 @@ function Copilot:ask(prompt, opts)
 
   self.current_job_on_cancel = on_done
 
-  local temp_file = vim.fn.tempname()
-  vim.fn.writefile({ body }, temp_file)
   self.current_job = curl
     .post(url, {
       headers = headers,
-      body = temp_file,
+      body = temp_file(body),
       proxy = self.proxy,
       insecure = self.allow_insecure,
       on_error = function(err)
@@ -487,12 +486,9 @@ function Copilot:embed(inputs, opts)
     local body = vim.json.encode(generate_embedding_request(chunk, model))
 
     table.insert(jobs, function(resolve)
-      local temp_file = vim.fn.tempname()
-      vim.fn.writefile({ body }, temp_file)
-
       curl.post(url, {
         headers = headers,
-        body = temp_file,
+        body = temp_file(body),
         proxy = self.proxy,
         insecure = self.allow_insecure,
         on_error = function(err)
diff --git a/lua/CopilotChat/utils.lua b/lua/CopilotChat/utils.lua
index fe6f6498..fe011a11 100644
--- a/lua/CopilotChat/utils.lua
+++ b/lua/CopilotChat/utils.lua
@@ -83,4 +83,18 @@ function M.show_virt_line(text, line, bufnr, mark_ns)
   })
 end
 
+--- Writes text to a temporary file and returns path
+---@param text string The text to write
+---@return string?
+function M.temp_file(text)
+  local temp_file = os.tmpname()
+  local f = io.open(temp_file, 'w+')
+  if f == nil then
+    error('Could not open file: ' .. temp_file)
+  end
+  f:write(text)
+  f:close()
+  return temp_file
+end
+
 return M