Add a note regarding availability

README.md

@@ -43,6 +43,10 @@ environment, demonstrating its practicality and effectiveness.
   through default values, a `config.yaml` file, and environment variables. For quick adjustments, use the `--set-model`
   and `--set-max-tokens` flags. To verify your current settings, use the `--config` or `-c` flag. The newly
   added `omit_history` configuration option adds another layer of customization to your user experience.
+* **Availability Note**: This CLI supports both gpt-4 and gpt-3.5-turbo models. However, the specific ChatGPT model used
+  on chat.openai.com may not be available via the OpenAI API. The pricing for API usage and the web-based platform may
+  also differ. For the latest model availability and pricing details, please refer to
+  the [OpenAI Pricing page](https://openai.com/pricing).
 
 ## Installation
 
@@ -336,8 +340,9 @@ data. If you have any concerns about this, please feel free to delete this direc
 
 ## Additional Resources
 
-* ["Summarize any text instantly with a single shortcut"](https://medium.com/@kardolus/summarize-any-text-instantly-with-a-single-shortcut-582551bcc6e2) on Medium: Dive deep into the capabilities of this CLI tool with this detailed walkthrough.
-* [Join the conversation](https://www.reddit.com/r/ChatGPT/comments/14ip6pm/summarize_any_text_instantly_with_a_single/) on Reddit: Discuss the tool, ask questions, and share your experiences with our growing community.
-
+* ["Summarize any text instantly with a single shortcut"](https://medium.com/@kardolus/summarize-any-text-instantly-with-a-single-shortcut-582551bcc6e2)
+  on Medium: Dive deep into the capabilities of this CLI tool with this detailed walkthrough.
+* [Join the conversation](https://www.reddit.com/r/ChatGPT/comments/14ip6pm/summarize_any_text_instantly_with_a_single/)
+  on Reddit: Discuss the tool, ask questions, and share your experiences with our growing community.
 
 Thank you for using ChatGPT CLI!