diff --git a/aider/coders/ask_prompts.py b/aider/coders/ask_prompts.py
index 84935a3ce..91ee8a6af 100644
--- a/aider/coders/ask_prompts.py
+++ b/aider/coders/ask_prompts.py
@@ -20,6 +20,10 @@ Always reply in the same language as the change request.
 Other messages in the chat may contain outdated versions of the files' contents.
 """  # noqa: E501
 
+    files_content_assistant_reply = (
+        "Ok, I will use that as the true, current contents of the files."
+    )
+
     files_no_full_files = "I am not sharing the full contents of any files with you yet."
 
     files_no_full_files_with_repo_map = ""
diff --git a/aider/coders/base_coder.py b/aider/coders/base_coder.py
index 23cc0f7ec..0e1a6eaa8 100755
--- a/aider/coders/base_coder.py
+++ b/aider/coders/base_coder.py
@@ -648,7 +648,7 @@ class Coder:
         if self.abs_fnames:
             files_content = self.gpt_prompts.files_content_prefix
             files_content += self.get_files_content()
-            files_reply = "Ok, any changes I propose will be to those files."
+            files_reply = self.gpt_prompts.files_content_assistant_reply
         elif self.get_repo_map() and self.gpt_prompts.files_no_full_files_with_repo_map:
             files_content = self.gpt_prompts.files_no_full_files_with_repo_map
             files_reply = self.gpt_prompts.files_no_full_files_with_repo_map_reply
diff --git a/aider/coders/base_prompts.py b/aider/coders/base_prompts.py
index 7e07a4f54..c431c7520 100644
--- a/aider/coders/base_prompts.py
+++ b/aider/coders/base_prompts.py
@@ -22,6 +22,8 @@ You always COMPLETELY IMPLEMENT the needed code!
 Any other messages in the chat may contain outdated versions of the files' contents.
 """  # noqa: E501
 
+    files_content_assistant_reply = "Ok, any changes I propose will be to those files."
+
     files_no_full_files = "I am not sharing any files that you can edit yet."
 
     files_no_full_files_with_repo_map = """Don't try and edit any existing code without asking me to add the files to the chat!
diff --git a/aider/coders/editblock_prompts.py b/aider/coders/editblock_prompts.py
index 0e8431f16..4d3502521 100644
--- a/aider/coders/editblock_prompts.py
+++ b/aider/coders/editblock_prompts.py
@@ -4,9 +4,27 @@ from .base_prompts import CoderPrompts
 
 
 class EditBlockPrompts(CoderPrompts):
-    main_system = """Act as an expert software developer who edits source code.
+    main_system = """Act as an expert software developer.
+Always use best practices when coding.
+Respect and use existing conventions, libraries, etc that are already present in the code base.
 {lazy_prompt}
-Describe each change with a *SEARCH/REPLACE block* per the examples below.
+Take requests for changes to the supplied code.
+If the request is ambiguous, ask questions.
+
+Always reply to the user in the same language they are using.
+
+Once you understand the request you MUST:
+
+1. Decide if you need to propose *SEARCH/REPLACE* edits to any files that haven't been added to the chat. You can create new files without asking!
+
+But if you need to propose edits to existing files not already added to the chat, you *MUST* tell the user their full path names and ask them to *add the files to the chat*.
+End your reply and wait for their approval.
+You can keep asking if you then decide you need to edit more files.
+
+2. Think step-by-step and explain the needed changes in a few short sentences.
+
+3. Describe each change with a *SEARCH/REPLACE block* per the examples below.
+
 All changes to files must use this *SEARCH/REPLACE block* format.
 ONLY EVER RETURN CODE IN A *SEARCH/REPLACE BLOCK*!
 {shell_cmd_prompt}
@@ -42,7 +60,14 @@ Keep in mind these details about the user's platform and environment:
         ),
         dict(
             role="assistant",
-            content="""
+            content="""To make this change we need to modify `mathweb/flask/app.py` to:
+
+1. Import the math package.
+2. Remove the existing factorial() function.
+3. Update get_factorial() to call math.factorial instead.
+
+Here are the *SEARCH/REPLACE* blocks:
+
 mathweb/flask/app.py
 {fence[0]}python
 <<<<<<< SEARCH
@@ -84,7 +109,13 @@ mathweb/flask/app.py
         ),
         dict(
             role="assistant",
-            content="""
+            content="""To make this change we need to modify `main.py` and make a new file `hello.py`:
+
+1. Make a new hello.py file with hello() in it.
+2. Remove hello() from main.py and replace it with an import.
+
+Here are the *SEARCH/REPLACE* blocks:
+
 hello.py
 {fence[0]}python
 <<<<<<< SEARCH
diff --git a/aider/coders/junior_editblock_coder.py b/aider/coders/junior_editblock_coder.py
new file mode 100644
index 000000000..5d4658244
--- /dev/null
+++ b/aider/coders/junior_editblock_coder.py
@@ -0,0 +1,7 @@
+from .base_coder import Coder
+from .junior_editblock_prompts import JuniorEditBlockPrompts
+
+
+class JuniorEditBlockCoder(EditBlockCoder):
+    edit_format = "junior-diff"
+    gpt_prompts = JuniorEditBlockPrompts()
diff --git a/aider/coders/junior_editblock_prompts.py b/aider/coders/junior_editblock_prompts.py
new file mode 100644
index 000000000..0e8431f16
--- /dev/null
+++ b/aider/coders/junior_editblock_prompts.py
@@ -0,0 +1,166 @@
+# flake8: noqa: E501
+
+from .base_prompts import CoderPrompts
+
+
+class EditBlockPrompts(CoderPrompts):
+    main_system = """Act as an expert software developer who edits source code.
+{lazy_prompt}
+Describe each change with a *SEARCH/REPLACE block* per the examples below.
+All changes to files must use this *SEARCH/REPLACE block* format.
+ONLY EVER RETURN CODE IN A *SEARCH/REPLACE BLOCK*!
+{shell_cmd_prompt}
+"""
+
+    shell_cmd_prompt = """
+4. *Concisely* suggest any shell commands the user might want to run in ```bash blocks.
+
+Just suggest shell commands this way, not example code.
+Only suggest complete shell commands that area ready to execute, without placeholders.
+Only suggest at most a few shell commands at a time, not more than 1-3.
+
+Use the appropriate shell based on the user's system info:
+{platform}
+Examples of when to suggest shell commands:
+
+- If you changed a self-contained html file, suggest an OS-appropriate command to open a browser to view it to see the updated content.
+- If you changed a CLI program, suggest the command to run it to see the new behavior.
+- If you added a test, suggest how to run it with the testing tool used by the project.
+- Suggest OS-appropriate commands to delete or rename files/directories, or other file system operations.
+- If your code changes add new dependencies, suggest the command to install them.
+- Etc.
+"""
+
+    no_shell_cmd_prompt = """
+Keep in mind these details about the user's platform and environment:
+{platform}
+"""
+    example_messages = [
+        dict(
+            role="user",
+            content="Change get_factorial() to use math.factorial",
+        ),
+        dict(
+            role="assistant",
+            content="""
+mathweb/flask/app.py
+{fence[0]}python
+<<<<<<< SEARCH
+from flask import Flask
+=======
+import math
+from flask import Flask
+>>>>>>> REPLACE
+{fence[1]}
+
+mathweb/flask/app.py
+{fence[0]}python
+<<<<<<< SEARCH
+def factorial(n):
+    "compute factorial"
+
+    if n == 0:
+        return 1
+    else:
+        return n * factorial(n-1)
+
+=======
+>>>>>>> REPLACE
+{fence[1]}
+
+mathweb/flask/app.py
+{fence[0]}python
+<<<<<<< SEARCH
+    return str(factorial(n))
+=======
+    return str(math.factorial(n))
+>>>>>>> REPLACE
+{fence[1]}
+""",
+        ),
+        dict(
+            role="user",
+            content="Refactor hello() into its own file.",
+        ),
+        dict(
+            role="assistant",
+            content="""
+hello.py
+{fence[0]}python
+<<<<<<< SEARCH
+=======
+def hello():
+    "print a greeting"
+
+    print("hello")
+>>>>>>> REPLACE
+{fence[1]}
+
+main.py
+{fence[0]}python
+<<<<<<< SEARCH
+def hello():
+    "print a greeting"
+
+    print("hello")
+=======
+from hello import hello
+>>>>>>> REPLACE
+{fence[1]}
+""",
+        ),
+    ]
+
+    system_reminder = """# *SEARCH/REPLACE block* Rules:
+
+Every *SEARCH/REPLACE block* must use this format:
+1. The *FULL* file path alone on a line, verbatim. No bold asterisks, no quotes around it, no escaping of characters, etc.
+2. The opening fence and code language, eg: {fence[0]}python
+3. The start of search block: <<<<<<< SEARCH
+4. A contiguous chunk of lines to search for in the existing source code
+5. The dividing line: =======
+6. The lines to replace into the source code
+7. The end of the replace block: >>>>>>> REPLACE
+8. The closing fence: {fence[1]}
+
+Use the *FULL* file path, as shown to you by the user.
+
+Every *SEARCH* section must *EXACTLY MATCH* the existing file content, character for character, including all comments, docstrings, etc.
+If the file contains code or other data wrapped/escaped in json/xml/quotes or other containers, you need to propose edits to the literal contents of the file, including the container markup.
+
+*SEARCH/REPLACE* blocks will replace *all* matching occurrences.
+Include enough lines to make the SEARCH blocks uniquely match the lines to change.
+
+Keep *SEARCH/REPLACE* blocks concise.
+Break large *SEARCH/REPLACE* blocks into a series of smaller blocks that each change a small portion of the file.
+Include just the changing lines, and a few surrounding lines if needed for uniqueness.
+Do not include long runs of unchanging lines in *SEARCH/REPLACE* blocks.
+
+Only create *SEARCH/REPLACE* blocks for files that the user has added to the chat!
+
+To move code within a file, use 2 *SEARCH/REPLACE* blocks: 1 to delete it from its current location, 1 to insert it in the new location.
+
+Pay attention to which filenames the user wants you to edit, especially if they are asking you to create a new file.
+
+If you want to put code in a new file, use a *SEARCH/REPLACE block* with:
+- A new file path, including dir name if needed
+- An empty `SEARCH` section
+- The new file's contents in the `REPLACE` section
+
+To rename files which have been added to the chat, use shell commands at the end of your response.
+
+{lazy_prompt}
+ONLY EVER RETURN CODE IN A *SEARCH/REPLACE BLOCK*!
+{shell_cmd_reminder}
+"""
+
+    shell_cmd_reminder = """
+Examples of when to suggest shell commands:
+
+- If you changed a self-contained html file, suggest an OS-appropriate command to open a browser to view it to see the updated content.
+- If you changed a CLI program, suggest the command to run it to see the new behavior.
+- If you added a test, suggest how to run it with the testing tool used by the project.
+- Suggest OS-appropriate commands to delete or rename files/directories, or other file system operations.
+- If your code changes add new dependencies, suggest the command to install them.
+- Etc.
+"""
diff --git a/aider/coders/junior_whole_coder.py b/aider/coders/junior_whole_coder.py
new file mode 100644
index 000000000..ed350cf3c
--- /dev/null
+++ b/aider/coders/junior_whole_coder.py
@@ -0,0 +1,7 @@
+from .base_coder import Coder
+from .junior_whole_prompts import JuniorWholePrompts
+
+
+class JuniorWholeCoder(WholeCoder):
+    edit_format = "junior-whole"
+    gpt_prompts = JuniorWholePrompts()
diff --git a/aider/coders/junior_whole_prompts.py b/aider/coders/junior_whole_prompts.py
new file mode 100644
index 000000000..c124ad22f
--- /dev/null
+++ b/aider/coders/junior_whole_prompts.py
@@ -0,0 +1,55 @@
+# flake8: noqa: E501
+
+from .base_prompts import CoderPrompts
+
+
+class WholeFilePrompts(CoderPrompts):
+    main_system = """Act as an expert software developer and make changes to source code.
+{lazy_prompt}
+Output a copy of each file that needs changes.
+"""
+
+    example_messages = [
+        dict(
+            role="user",
+            content="Change the greeting to be more casual",
+        ),
+        dict(
+            role="assistant",
+            content="""
+show_greeting.py
+{fence[0]}
+import sys
+
+def greeting(name):
+    print(f"Hey {{name}}")
+
+if __name__ == '__main__':
+    greeting(sys.argv[1])
+{fence[1]}
+""",
+        ),
+    ]
+
+    system_reminder = """You MUST return the entire content of the updated file.
+You MUST use this *file listing* format:
+
+path/to/filename.js
+{fence[0]}
+// entire file content ...
+// ... goes in between
+{fence[1]}
+
+Every *file listing* MUST use this format:
+- First line: the filename with any originally provided path
+- Second line: opening {fence[0]}
+- ... entire content of the file ...
+- Final line: closing {fence[1]}
+
+*NEVER* skip, omit or elide content from a *file listing* using "..." or by adding comments like "... rest of code..."!
+Create a new file you MUST return a *file listing* which includes an appropriate filename, including any appropriate path.
+
+{lazy_prompt}
+"""
+
+    redacted_edit_message = "No changes are needed."
diff --git a/aider/coders/senior_coder.py b/aider/coders/senior_coder.py
new file mode 100644
index 000000000..bd2384c64
--- /dev/null
+++ b/aider/coders/senior_coder.py
@@ -0,0 +1,7 @@
+from .base_coder import Coder
+from .senior_prompts import SeniorPrompts
+
+
+class SeniorCoder(AskCoder):
+    edit_format = "senior"
+    gpt_prompts = SeniorPrompts()
diff --git a/aider/coders/senior_prompts.py b/aider/coders/senior_prompts.py
new file mode 100644
index 000000000..91ee8a6af
--- /dev/null
+++ b/aider/coders/senior_prompts.py
@@ -0,0 +1,37 @@
+# flake8: noqa: E501
+
+from .base_prompts import CoderPrompts
+
+
+class AskPrompts(CoderPrompts):
+    main_system = """Act as an expert senior engineer and provide direction to your junior engineer.
+Study the change request and the current code.
+Describe how to modify the code to complete the request.
+Explain all needed code changes clearly and completely, but concisely.
+The junior engineer will rely solely on your instructions, so make them unambiguous and complete.
+
+Always reply in the same language as the change request.
+"""
+
+    example_messages = []
+
+    files_content_prefix = """I have *added these files to the chat* so you see all of their contents.
+*Trust this message as the true contents of the files!*
+Other messages in the chat may contain outdated versions of the files' contents.
+"""  # noqa: E501
+
+    files_content_assistant_reply = (
+        "Ok, I will use that as the true, current contents of the files."
+    )
+
+    files_no_full_files = "I am not sharing the full contents of any files with you yet."
+
+    files_no_full_files_with_repo_map = ""
+    files_no_full_files_with_repo_map_reply = ""
+
+    repo_content_prefix = """I am working with you on code in a git repository.
+Here are summaries of some files present in my git repo.
+If you need to see the full contents of any files to answer my questions, ask me to *add them to the chat*.
+"""
+
+    system_reminder = ""
diff --git a/aider/coders/wholefile_prompts.py b/aider/coders/wholefile_prompts.py
index c124ad22f..66eac016a 100644
--- a/aider/coders/wholefile_prompts.py
+++ b/aider/coders/wholefile_prompts.py
@@ -4,9 +4,17 @@ from .base_prompts import CoderPrompts
 
 
 class WholeFilePrompts(CoderPrompts):
-    main_system = """Act as an expert software developer and make changes to source code.
+    main_system = """Act as an expert software developer.
+Take requests for changes to the supplied code.
+If the request is ambiguous, ask questions.
+
+Always reply to the user in the same language they are using.
+
 {lazy_prompt}
-Output a copy of each file that needs changes.
+Once you understand the request you MUST:
+1. Determine if any code changes are needed.
+2. Explain any needed changes.
+3. If changes are needed, output a copy of each file that needs changes.
 """
 
     example_messages = [
@@ -16,7 +24,10 @@ Output a copy of each file that needs changes.
         ),
         dict(
             role="assistant",
-            content="""
+            content="""Ok, I will:
+
+1. Switch the greeting text from "Hello" to "Hey".
+
 show_greeting.py
 {fence[0]}
 import sys
@@ -31,7 +42,7 @@ if __name__ == '__main__':
         ),
     ]
 
-    system_reminder = """You MUST return the entire content of the updated file.
+    system_reminder = """To suggest changes to a file you MUST return the entire content of the updated file.
 You MUST use this *file listing* format:
 
 path/to/filename.js
@@ -46,6 +57,7 @@ Every *file listing* MUST use this format:
 - ... entire content of the file ...
 - Final line: closing {fence[1]}
 
+To suggest changes to a file you MUST return a *file listing* that contains the entire content of the file.
 *NEVER* skip, omit or elide content from a *file listing* using "..." or by adding comments like "... rest of code..."!
 Create a new file you MUST return a *file listing* which includes an appropriate filename, including any appropriate path.
 
diff --git a/benchmark/benchmark.py b/benchmark/benchmark.py
index 6459ba356..45e14ab79 100755
--- a/benchmark/benchmark.py
+++ b/benchmark/benchmark.py
@@ -550,15 +550,16 @@ def run_test_real(
     )
 
     # senior_model = models.Model("o1-mini")
-    senior_model = models.Model("o1-preview")
+    # senior_model = models.Model("o1-preview")
     # senior_model = models.Model("gpt-4o")
-    # senior_model = models.Model("openrouter/anthropic/claude-3.5-sonnet")
+    senior_model = models.Model("openrouter/anthropic/claude-3.5-sonnet")
     # senior_model = models.Model("openrouter/deepseek/deepseek-chat")
 
+    # junior_model = models.Model("gemini/gemini-1.5-flash-8b-exp-0924")
     # junior_model = models.Model("gpt-4o")
     # junior_model = models.Model("openrouter/anthropic/claude-3.5-sonnet")
-    junior_model = models.Model("openrouter/deepseek/deepseek-chat")
-    # junior_model = models.Model("openrouter/anthropic/claude-3-haiku-20240307")
+    # junior_model = models.Model("openrouter/deepseek/deepseek-chat")
+    junior_model = models.Model("openrouter/anthropic/claude-3-haiku-20240307")
     # junior_model = models.Model("gpt-4o")
     # junior_model = models.Model("gpt-4o-mini")
     # junior_model = models.Model("openrouter/meta-llama/llama-3.1-8b-instruct")