Clarify OpenAI Codex VS Code extension availability is Pro+ only (#60673)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: sunbrye <56200261+sunbrye@users.noreply.github.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Miro Masat <1513048+miromasat@users.noreply.github.com>
Co-authored-by: Sophie <29382425+sophietheking@users.noreply.github.com>

Author: 5 people

content/copilot/concepts/agents/openai-codex.md

@@ -19,6 +19,8 @@ The {% data variables.product.prodname_openai_codex %} coding agent and the {% d
 
 ## {% data variables.product.prodname_openai_codex %} coding agent
 
+The {% data variables.product.prodname_openai_codex %} coding agent is available to {% data variables.copilot.copilot_pro %}, {% data variables.copilot.copilot_pro_plus %}, {% data variables.copilot.copilot_for_business %}, and {% data variables.copilot.copilot_enterprise %} users.
+
 Before you can assign tasks to {% data variables.product.prodname_openai_codex %} coding agent, it must be enabled. See [AUTOTITLE](/copilot/how-tos/manage-your-account/manage-policies#enabling-or-disabling-third-party-agents-in-your-repositories). 
 
 To learn more about using third-party agents on {% data variables.product.github %}, see [AUTOTITLE](/free-pro-team@latest/copilot/concepts/agents/about-third-party-agents).
@@ -34,7 +36,9 @@ If you select **Auto**, {% data variables.copilot.copilot_auto_model_selection %
 
 ## {% data variables.product.prodname_vscode_shortname %} extension
 
- Use "Sign in with {% data variables.product.prodname_copilot_short %}" when launching the extension. {% data variables.product.prodname_copilot_short %} users can see this integration in the [Agent Sessions view](https://code.visualstudio.com/docs/copilot/chat/chat-sessions#_agent-sessions-view) in {% data variables.product.prodname_vscode_shortname %} Insiders along with progress on their running tasks. All usage is subject to {% data variables.product.github %} rate limits and billing. See [AUTOTITLE](/copilot/concepts/billing/copilot-requests#premium-features).
+> [!NOTE] The "Sign in with {% data variables.product.prodname_copilot_short %}" option in the {% data variables.product.prodname_openai_codex %} {% data variables.product.prodname_vscode_shortname %} extension is only available to {% data variables.copilot.copilot_pro_plus %} subscribers.
+
+Use "Sign in with {% data variables.product.prodname_copilot_short %}" when launching the extension. {% data variables.copilot.copilot_pro_plus_short %} users can see this integration in the [Agent Sessions view](https://code.visualstudio.com/docs/copilot/chat/chat-sessions#_agent-sessions-view) in {% data variables.product.prodname_vscode_shortname %} Insiders along with progress on their running tasks. All usage is subject to {% data variables.product.github %} rate limits and billing. See [AUTOTITLE](/copilot/concepts/billing/copilot-requests#premium-features).
 
 ### Model availability
 

data/reusables/gated-features/openai-codex.md

@@ -1 +1 @@
-{% data variables.product.prodname_openai_codex %} is available in the {% data variables.copilot.copilot_pro %}, {% data variables.copilot.copilot_pro_plus %}, {% data variables.copilot.copilot_for_business %}, and {% data variables.copilot.copilot_enterprise %} plans.
+The {% data variables.product.prodname_openai_codex %} coding agent is available in the {% data variables.copilot.copilot_pro %}, {% data variables.copilot.copilot_pro_plus %}, {% data variables.copilot.copilot_for_business %}, and {% data variables.copilot.copilot_enterprise %} plans. In the {% data variables.product.prodname_openai_codex %} {% data variables.product.prodname_vscode_shortname %} extension, the **Sign in with {% data variables.product.prodname_copilot_short %}** option is available to {% data variables.copilot.copilot_pro_plus %} subscribers only.