anthropic: Add support for Claude 4 (#31203)

This PR adds support for [Claude
4](https://www.anthropic.com/news/claude-4).

Release Notes:

- Added support for Claude Opus 4 and Claude Sonnet 4.

---------

Co-authored-by: Antonio Scandurra <me@as-cii.com>
Co-authored-by: Richard Feldman <oss@rtfeldman.com>

crates/language_models/src/provider/cloud.rs

@@ -19,8 +19,8 @@ use language_model::{
     ZED_CLOUD_PROVIDER_ID,
 };
 use language_model::{
-    LanguageModelAvailability, LanguageModelCompletionEvent, LanguageModelProvider, LlmApiToken,
-    PaymentRequiredError, RefreshLlmTokenListener,
+    LanguageModelCompletionEvent, LanguageModelProvider, LlmApiToken, PaymentRequiredError,
+    RefreshLlmTokenListener,
 };
 use proto::Plan;
 use release_channel::AppVersion;
@@ -331,6 +331,14 @@ impl LanguageModelProvider for CloudLanguageModelProvider {
                 anthropic::Model::Claude3_7SonnetThinking.id().to_string(),
                 CloudModel::Anthropic(anthropic::Model::Claude3_7SonnetThinking),
             );
+            models.insert(
+                anthropic::Model::ClaudeSonnet4.id().to_string(),
+                CloudModel::Anthropic(anthropic::Model::ClaudeSonnet4),
+            );
+            models.insert(
+                anthropic::Model::ClaudeSonnet4Thinking.id().to_string(),
+                CloudModel::Anthropic(anthropic::Model::ClaudeSonnet4Thinking),
+            );
         }
 
         let llm_closed_beta_models = if cx.has_flag::<LlmClosedBetaFeatureFlag>() {
@@ -699,10 +707,6 @@ impl LanguageModel for CloudLanguageModel {
         format!("zed.dev/{}", self.model.id())
     }
 
-    fn availability(&self) -> LanguageModelAvailability {
-        self.model.availability()
-    }
-
     fn tool_input_format(&self) -> LanguageModelToolSchemaFormat {
         self.model.tool_input_format()
     }