diff --git a/HISTORY.md b/HISTORY.md
index b942f392b..257018ed3 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,6 +1,13 @@
 
 # Release history
 
+### v0.39.0
+
+- Use `--sonnet` for Claude 3.5 Sonnet, which is the top model on [aider's LLM code editing leaderboard](https://aider.chat/docs/leaderboards/#claude-35-sonnet-takes-the-top-spot).
+- All `AIDER_xxx` environment variables can now be set in `.env` (by @jpshack-at-palomar).
+- Commit messages are no longer prefixed with "aider:". Instead the git author and committer names have "(aider)" added to them.
+- Use `--llm-history-file` to log raw messages sent to the LLM (by @daniel-vainsencher).
+
 ### v0.38.0
 
 - Use `--vim` for [vim keybindings](https://aider.chat/docs/commands.html#vi) in the chat.
diff --git a/README.md b/README.md
index d750ae543..78af92915 100644
--- a/README.md
+++ b/README.md
@@ -43,9 +43,14 @@ $ cd /to/your/git/repo
 $ export OPENAI_API_KEY=your-key-goes-here
 $ aider 
 
-# Or, work with Claude 3 Opus on your repo
+# Or, work with Anthropic's models
 $ export ANTHROPIC_API_KEY=your-key-goes-here
+
+# Claude 3 Opus
 $ aider --opus
+
+# Claude 3.5 Sonnet
+$ aider --sonnet
 ```
 <!--[[[end]]]-->
 
diff --git a/aider/models.py b/aider/models.py
index 6470727d0..ac150d546 100644
--- a/aider/models.py
+++ b/aider/models.py
@@ -179,7 +179,13 @@ MODEL_SETTINGS = [
         weak_model_name="claude-3-haiku-20240307",
     ),
     ModelSettings(
-        "anthropic/claude-3.5-sonnet",
+        "claude-3-5-sonnet-20240620",
+        "diff",
+        weak_model_name="claude-3-haiku-20240307",
+        use_repo_map=True,
+    ),
+    ModelSettings(
+        "anthropic/claude-3-5-sonnet-20240620",
         "diff",
         weak_model_name="claude-3-haiku-20240307",
         use_repo_map=True,
diff --git a/website/_includes/get-started.md b/website/_includes/get-started.md
index 498d310dc..e31d2ca3a 100644
--- a/website/_includes/get-started.md
+++ b/website/_includes/get-started.md
@@ -10,7 +10,12 @@ $ cd /to/your/git/repo
 $ export OPENAI_API_KEY=your-key-goes-here
 $ aider 
 
-# Or, work with Claude 3 Opus on your repo
+# Or, work with Anthropic's models
 $ export ANTHROPIC_API_KEY=your-key-goes-here
+
+# Claude 3 Opus
 $ aider --opus
+
+# Claude 3.5 Sonnet
+$ aider --sonnet
 ```
diff --git a/website/index.md b/website/index.md
index 98a08a5b0..7d847f65d 100644
--- a/website/index.md
+++ b/website/index.md
@@ -57,9 +57,14 @@ $ cd /to/your/git/repo
 $ export OPENAI_API_KEY=your-key-goes-here
 $ aider 
 
-# Or, work with Claude 3 Opus on your repo
+# Or, work with Anthropic's models
 $ export ANTHROPIC_API_KEY=your-key-goes-here
+
+# Claude 3 Opus
 $ aider --opus
+
+# Claude 3.5 Sonnet
+$ aider --sonnet
 ```
 <!-- NOOP -->