diff --git a/lib/elixir/src/elixir.app.src b/lib/elixir/src/elixir.app.src
index fa177fc626..05a67b436b 100644
--- a/lib/elixir/src/elixir.app.src
+++ b/lib/elixir/src/elixir.app.src
@@ -6,7 +6,6 @@
  {applications, [kernel,stdlib,compiler]},
  {mod, {elixir,[]}},
  {env, [
-  {ansi_enabled, false},
   {ansi_syntax_colors, [
     {atom, cyan},
     {binary, default_color},
diff --git a/lib/elixir/src/elixir.erl b/lib/elixir/src/elixir.erl
index af88e46165..4de9d056bc 100644
--- a/lib/elixir/src/elixir.erl
+++ b/lib/elixir/src/elixir.erl
@@ -50,6 +50,14 @@ start(_Type, _Args) ->
     false -> ok
   end,
 
+  case application:get_env(elixir, ansi_enabled) of
+    {ok, _} -> ok;
+    undefined ->
+      %% Remove prim_tty module check as well as checks from scripts on Erlang/OTP 26
+      ANSIEnabled = erlang:module_loaded(prim_tty) andalso prim_tty:isatty(stdout),
+      application:set_env(elixir, ansi_enabled, ANSIEnabled)
+  end,
+
   Tokenizer = case code:ensure_loaded('Elixir.String.Tokenizer') of
     {module, Mod} -> Mod;
     _ -> elixir_tokenizer
diff --git a/lib/elixir/src/elixir_errors.erl b/lib/elixir/src/elixir_errors.erl
index a54c3442dd..d3f5b28efa 100644
--- a/lib/elixir/src/elixir_errors.erl
+++ b/lib/elixir/src/elixir_errors.erl
@@ -218,15 +218,15 @@ send_diagnostic(Type, Line, File, Message) ->
   ok.
 
 warning_prefix() ->
-  case application:get_env(elixir, ansi_enabled) of
-    {ok, true} -> <<"\e[33mwarning: \e[0m">>;
-    _ -> <<"warning: ">>
+  case application:get_env(elixir, ansi_enabled, false) of
+    true -> <<"\e[33mwarning: \e[0m">>;
+    false -> <<"warning: ">>
   end.
 
 error_prefix() ->
-  case application:get_env(elixir, ansi_enabled) of
-    {ok, true} -> <<"\e[31merror: \e[0m">>;
-    _ -> <<"error: ">>
+  case application:get_env(elixir, ansi_enabled, false) of
+    true -> <<"\e[31merror: \e[0m">>;
+    false -> <<"error: ">>
   end.
 
 env_format(Meta, #{file := EnvFile} = E) ->
diff --git a/lib/iex/lib/iex.ex b/lib/iex/lib/iex.ex
index d8f0fdf7c7..6aa64b1c68 100644
--- a/lib/iex/lib/iex.ex
+++ b/lib/iex/lib/iex.ex
@@ -25,10 +25,11 @@ defmodule IEx do
   aren't explicitly documented and where the function name is in the form
   of `__foo__`.
 
-  Autocomplete may not be available on some Windows shells. You may need
-  to pass the `--werl` option when starting IEx, such as `iex --werl`
-  (or `iex.bat --werl` if using PowerShell). `--werl` may be permanently
-  enabled by setting the `IEX_WITH_WERL` environment variable to `1`.
+  Autocomplete is available by default on Windows shells from Erlang/OTP 26.
+  In earlier versions, you may need to pass the `--werl` option when starting
+  IEx, such as `iex --werl` (or `iex.bat --werl` if using PowerShell).
+  `--werl` may be permanently enabled by setting the `IEX_WITH_WERL`
+  environment variable to `1`.
 
   ## Encoding and coloring
 
@@ -40,9 +41,10 @@ defmodule IEx do
   PowerShell).
 
   Similarly, ANSI coloring is enabled by default on most Unix terminals.
-  They are also available on Windows consoles from Windows 10, although
-  it must be explicitly enabled for the current user in the registry by
-  running the following command:
+  They are also available on Windows consoles from Windows 10 and on
+  Erlang/OTP 26 or later. For earlier Erlang/OTP versions, you can
+  explicitly enable it for the current user in the registry by running
+  the following command:
 
       $ reg add HKCU\Console /v VirtualTerminalLevel /t REG_DWORD /d 1