OpenAI o1-preview and o1-mini support (#17796)

Release Notes:

- Added support for OpenAI o1-mini and o1-preview models.

---------

Co-authored-by: Jason Mancuso <7891333+jvmncs@users.noreply.github.com>
Co-authored-by: Bennet <bennet@zed.dev>

crates/language_model/src/provider/open_ai.rs

@@ -372,10 +372,13 @@ pub fn count_open_ai_tokens(
                 })
                 .collect::<Vec<_>>();
 
-            if let open_ai::Model::Custom { .. } = model {
-                tiktoken_rs::num_tokens_from_messages("gpt-4", &messages)
-            } else {
-                tiktoken_rs::num_tokens_from_messages(model.id(), &messages)
+            match model {
+                open_ai::Model::Custom { .. }
+                | open_ai::Model::O1Mini
+                | open_ai::Model::O1Preview => {
+                    tiktoken_rs::num_tokens_from_messages("gpt-4", &messages)
+                }
+                _ => tiktoken_rs::num_tokens_from_messages(model.id(), &messages),
             }
         })
         .boxed()