From 595f61f0d66018293a37161f55ee033a2dea3ae8 Mon Sep 17 00:00:00 2001
From: Peter Tripp <peter@zed.dev>
Date: Sun, 22 Jun 2025 15:15:20 -0400
Subject: [PATCH] bedrock: Use Claude 3.0 Haiku where Haiku 3.5 is not
 available (#33214)

Closes: https://github.com/zed-industries/zed/issues/33183

@kuzaxak Can you confirm this works for you?

Release Notes:

- bedrock: Use Anthropic Haiku 3.0 in AWS regions where Haiku 3.5 is
unavailable
---
 crates/bedrock/src/models.rs                  |  8 +++--
 .../language_models/src/provider/bedrock.rs   | 33 +++++++++----------
 2 files changed, 22 insertions(+), 19 deletions(-)

diff --git a/crates/bedrock/src/models.rs b/crates/bedrock/src/models.rs
index e744894cf3..41cea4ab86 100644
--- a/crates/bedrock/src/models.rs
+++ b/crates/bedrock/src/models.rs
@@ -108,8 +108,12 @@ pub enum Model {
 }
 
 impl Model {
-    pub fn default_fast() -> Self {
-        Self::Claude3_5Haiku
+    pub fn default_fast(region: &str) -> Self {
+        if region.starts_with("us-") {
+            Self::Claude3_5Haiku
+        } else {
+            Self::Claude3Haiku
+        }
     }
 
     pub fn from_id(id: &str) -> anyhow::Result<Self> {
diff --git a/crates/language_models/src/provider/bedrock.rs b/crates/language_models/src/provider/bedrock.rs
index c377e614c1..ed5e372616 100644
--- a/crates/language_models/src/provider/bedrock.rs
+++ b/crates/language_models/src/provider/bedrock.rs
@@ -229,6 +229,17 @@ impl State {
             Ok(())
         })
     }
+
+    fn get_region(&self) -> String {
+        // Get region - from credentials or directly from settings
+        let credentials_region = self.credentials.as_ref().map(|s| s.region.clone());
+        let settings_region = self.settings.as_ref().and_then(|s| s.region.clone());
+
+        // Use credentials region if available, otherwise use settings region, finally fall back to default
+        credentials_region
+            .or(settings_region)
+            .unwrap_or(String::from("us-east-1"))
+    }
 }
 
 pub struct BedrockLanguageModelProvider {
@@ -289,8 +300,9 @@ impl LanguageModelProvider for BedrockLanguageModelProvider {
         Some(self.create_language_model(bedrock::Model::default()))
     }
 
-    fn default_fast_model(&self, _cx: &App) -> Option<Arc<dyn LanguageModel>> {
-        Some(self.create_language_model(bedrock::Model::default_fast()))
+    fn default_fast_model(&self, cx: &App) -> Option<Arc<dyn LanguageModel>> {
+        let region = self.state.read(cx).get_region();
+        Some(self.create_language_model(bedrock::Model::default_fast(region.as_str())))
     }
 
     fn provided_models(&self, cx: &App) -> Vec<Arc<dyn LanguageModel>> {
@@ -377,11 +389,7 @@ impl BedrockModel {
 
                         let endpoint = state.settings.as_ref().and_then(|s| s.endpoint.clone());
 
-                        let region = state
-                            .settings
-                            .as_ref()
-                            .and_then(|s| s.region.clone())
-                            .unwrap_or(String::from("us-east-1"));
+                        let region = state.get_region();
 
                         (
                             auth_method,
@@ -530,16 +538,7 @@ impl LanguageModel for BedrockModel {
             LanguageModelCompletionError,
         >,
     > {
-        let Ok(region) = cx.read_entity(&self.state, |state, _cx| {
-            // Get region - from credentials or directly from settings
-            let credentials_region = state.credentials.as_ref().map(|s| s.region.clone());
-            let settings_region = state.settings.as_ref().and_then(|s| s.region.clone());
-
-            // Use credentials region if available, otherwise use settings region, finally fall back to default
-            credentials_region
-                .or(settings_region)
-                .unwrap_or(String::from("us-east-1"))
-        }) else {
+        let Ok(region) = cx.read_entity(&self.state, |state, _cx| state.get_region()) else {
             return async move { Err(anyhow::anyhow!("App State Dropped").into()) }.boxed();
         };