added streaming support to anthropic models

src/core/client.rs

@@ -51,15 +51,14 @@ impl ChatClient {
             ChatClient::OpenAI(client) => {
                 client.chat_completion_stream(model, messages, enable_web_search, enable_reasoning_summary, reasoning_effort, stream_callback).await
             }
-            ChatClient::Anthropic(_) => {
-                // Fallback to non-streaming for Anthropic
-                self.chat_completion(model, messages, enable_web_search, enable_reasoning_summary, reasoning_effort).await
+            ChatClient::Anthropic(client) => {
+                client.chat_completion_stream(model, messages, enable_web_search, enable_reasoning_summary, reasoning_effort, stream_callback).await
             }
         }
     }
 
     pub fn supports_streaming(&self) -> bool {
-        matches!(self, ChatClient::OpenAI(_))
+        matches!(self, ChatClient::OpenAI(_) | ChatClient::Anthropic(_))
     }
     
     pub fn supports_feature(&self, feature: &str) -> bool {
@@ -229,6 +228,65 @@ struct AnthropicContent {
     text: String,
 }
 
+// Anthropic streaming structures
+#[derive(Deserialize, Debug)]
+struct AnthropicStreamEvent {
+    #[serde(rename = "type")]
+    event_type: String,
+    #[serde(flatten)]
+    data: serde_json::Value,
+}
+
+#[derive(Deserialize, Debug)]
+struct AnthropicMessageStart {
+    message: AnthropicMessage,
+}
+
+#[derive(Deserialize, Debug)]
+struct AnthropicMessage {
+    id: String,
+    #[serde(rename = "type")]
+    message_type: String,
+    role: String,
+    content: Vec<AnthropicContentBlock>,
+    model: String,
+    stop_reason: Option<String>,
+    stop_sequence: Option<String>,
+    usage: AnthropicUsage,
+}
+
+#[derive(Deserialize, Debug)]
+struct AnthropicContentBlock {
+    #[serde(rename = "type")]
+    content_type: String,
+    text: Option<String>,
+}
+
+#[derive(Deserialize, Debug)]
+struct AnthropicUsage {
+    input_tokens: u32,
+    output_tokens: u32,
+}
+
+#[derive(Deserialize, Debug)]
+struct AnthropicContentBlockStart {
+    index: u32,
+    content_block: AnthropicContentBlock,
+}
+
+#[derive(Deserialize, Debug)]
+struct AnthropicContentBlockDelta {
+    index: u32,
+    delta: AnthropicDelta,
+}
+
+#[derive(Deserialize, Debug)]
+struct AnthropicDelta {
+    #[serde(rename = "type")]
+    delta_type: String,
+    text: Option<String>,
+}
+
 impl OpenAIClient {
     pub fn new(config: &Config) -> Result<Self> {
         let api_key = env::var("OPENAI_API_KEY")
@@ -859,15 +917,116 @@ impl AnthropicClient {
         Ok(content.clone())
     }
 
+    pub async fn chat_completion_stream(
+        &self,
+        model: &str,
+        messages: &[Message],
+        _enable_web_search: bool,
+        _enable_reasoning_summary: bool,
+        _reasoning_effort: &str,
+        stream_callback: StreamCallback,
+    ) -> Result<String> {
+        let url = format!("{}/messages", self.base_url);
+        
+        let (system_prompt, user_messages) = Self::convert_messages(messages);
+        
+        let config = crate::config::Config::load().unwrap_or_default();
+        let mut payload = json!({
+            "model": model,
+            "max_tokens": config.limits.max_tokens_anthropic,
+            "messages": user_messages,
+            "stream": true
+        });
+
+        if let Some(system) = system_prompt {
+            payload["system"] = json!(system);
+        }
+
+        let response = self
+            .client
+            .post(&url)
+            .header("x-api-key", &self.api_key)
+            .header("Content-Type", "application/json")
+            .header("anthropic-version", &config.api.anthropic_version)
+            .json(&payload)
+            .send()
+            .await
+            .context("Failed to send request to Anthropic API")?;
+
+        if !response.status().is_success() {
+            let error_text = response.text().await.unwrap_or_else(|_| "Unknown error".to_string());
+            return Err(anyhow::anyhow!("Anthropic API error: {}", error_text));
+        }
+
+        let mut full_response = String::new();
+        let mut stream = response.bytes_stream();
+
+        while let Some(chunk) = stream.next().await {
+            let chunk = chunk.context("Failed to read chunk from Anthropic stream")?;
+            let chunk_str = std::str::from_utf8(&chunk)
+                .context("Failed to parse Anthropic chunk as UTF-8")?;
+
+            // Parse server-sent events for Anthropic
+            for line in chunk_str.lines() {
+                if line.starts_with("data: ") {
+                    let data = &line[6..];
+                    
+                    // Skip empty data lines and [DONE] markers
+                    if data.trim().is_empty() || data == "[DONE]" {
+                        continue;
+                    }
+                    
+                    match serde_json::from_str::<AnthropicStreamEvent>(data) {
+                        Ok(event) => {
+                            match event.event_type.as_str() {
+                                "content_block_delta" => {
+                                    if let Ok(delta_event) = serde_json::from_value::<AnthropicContentBlockDelta>(event.data) {
+                                        if let Some(text) = delta_event.delta.text {
+                                            if !text.is_empty() {
+                                                full_response.push_str(&text);
+                                                stream_callback(&text).await;
+                                            }
+                                        }
+                                    }
+                                }
+                                "message_start" | "content_block_start" | "content_block_stop" | "message_delta" | "message_stop" => {
+                                    // Handle other event types if needed
+                                }
+                                _ => {
+                                    // Unknown event type, skip
+                                }
+                            }
+                        }
+                        Err(_) => {
+                            // Skip malformed JSON chunks
+                            continue;
+                        }
+                    }
+                } else if line.starts_with("event: ") {
+                    // Event type line, can be ignored as we parse it from the data
+                    continue;
+                }
+            }
+        }
+
+        if full_response.is_empty() {
+            return Err(anyhow::anyhow!("No content found in Anthropic stream response"));
+        }
+
+        Ok(full_response)
+    }
+
     pub fn supports_feature(&self, feature: &str) -> bool {
         match feature {
-            "web_search" | "reasoning_summary" => false,
+            "streaming" => true,
+            "web_search" | "reasoning_summary" | "reasoning_effort" => false,
             _ => false,
         }
     }
     
     pub fn supports_feature_for_model(&self, feature: &str, _model: &str) -> bool {
         match feature {
+            "streaming" => true,
             "web_search" | "reasoning_summary" | "reasoning_effort" => false,
             _ => false,
         }

src/core/provider.rs

@@ -36,10 +36,10 @@ pub fn get_supported_models() -> HashMap<Provider, Vec<&'static str>> {
     models.insert(
         Provider::Anthropic,
         vec![
-            "claude-3-5-sonnet-20241022",
+            "claude-opus-4-1-20250805",
+            "claude-sonnet-4-20250514",
+            "claude-3-7-sonnet-20250219",
             "claude-3-5-haiku-20241022",
-            "claude-3-opus-20240229",
-            "claude-3-sonnet-20240229",
             "claude-3-haiku-20240307",
         ],
     );

src/utils/display.rs

@@ -210,8 +210,8 @@ Environment Variables:
 
 Supported Models:
   OpenAI: gpt-4.1, gpt-4.1-mini, gpt-4o, gpt-5, gpt-5-chat-latest, o1, o3, o4-mini, o3-mini
-  Anthropic: claude-3-5-sonnet-20241022, claude-3-5-haiku-20241022, 
-             claude-3-opus-20240229, claude-3-sonnet-20240229, 
+  Anthropic: claude-opus-4-1-20250805, claude-sonnet-4-20250514, 
+             claude-3-7-sonnet-20250219, claude-3-5-haiku-20241022, 
              claude-3-haiku-20240307
 "#;
         println!("{}", style(help_text).dim());