diff --git a/rust/.claude/sessions/session-1775008071886.json b/rust/.claude/sessions/session-1775008071886.json
new file mode 100644
index 0000000..d45e491
--- /dev/null
+++ b/rust/.claude/sessions/session-1775008071886.json
@@ -0,0 +1 @@
+{"messages":[],"version":1}
\ No newline at end of file
diff --git a/rust/crates/api/src/client.rs b/rust/crates/api/src/client.rs
index 4635981..110a80b 100644
--- a/rust/crates/api/src/client.rs
+++ b/rust/crates/api/src/client.rs
@@ -906,7 +906,7 @@ mod tests {
     #[test]
     fn message_request_stream_helper_sets_stream_true() {
         let request = MessageRequest {
-            model: "claude-3-7-sonnet-latest".to_string(),
+            model: "claude-opus-4-6".to_string(),
             max_tokens: 64,
             messages: vec![],
             system: None,
diff --git a/rust/crates/rusty-claude-cli/src/args.rs b/rust/crates/rusty-claude-cli/src/args.rs
index 6c98269..990beb4 100644
--- a/rust/crates/rusty-claude-cli/src/args.rs
+++ b/rust/crates/rusty-claude-cli/src/args.rs
@@ -9,7 +9,7 @@ use clap::{Parser, Subcommand, ValueEnum};
     about = "Rust Claude CLI prototype"
 )]
 pub struct Cli {
-    #[arg(long, default_value = "claude-3-7-sonnet")]
+    #[arg(long, default_value = "claude-opus-4-6")]
     pub model: String,
 
     #[arg(long, value_enum, default_value_t = PermissionMode::WorkspaceWrite)]
diff --git a/rust/crates/rusty-claude-cli/src/main.rs b/rust/crates/rusty-claude-cli/src/main.rs
index 4a600b0..173df7e 100644
--- a/rust/crates/rusty-claude-cli/src/main.rs
+++ b/rust/crates/rusty-claude-cli/src/main.rs
@@ -34,7 +34,7 @@ use runtime::{
 use serde_json::json;
 use tools::{execute_tool, mvp_tool_specs, ToolSpec};
 
-const DEFAULT_MODEL: &str = "claude-sonnet-4-20250514";
+const DEFAULT_MODEL: &str = "claude-opus-4-6";
 const DEFAULT_MAX_TOKENS: u32 = 32;
 const DEFAULT_DATE: &str = "2026-03-31";
 const DEFAULT_OAUTH_CALLBACK_PORT: u16 = 4545;