fix: improve PDF support detection and update model suggestions

aider/coders/base_coder.py

@@ -719,10 +719,12 @@ def get_chat_files_messages(self):
 
     def get_images_message(self, fnames):
         supports_images = self.main_model.info.get("supports_vision")
-        supports_pdfs = self.main_model.info.get("supports_pdf_input")
+        supports_pdfs = self.main_model.info.get("supports_pdf_input") or self.main_model.info.get(
+            "max_pdf_size_mb"
+        )
 
         # https://github.com/BerriAI/litellm/pull/6928
-        supports_pdfs = "claude-3-5-sonnet-20241022" in self.main_model.name
+        supports_pdfs = supports_pdfs or "claude-3-5-sonnet-20241022" in self.main_model.name
 
         if not (supports_images or supports_pdfs):
             return None
@@ -1396,9 +1398,7 @@ def show_exhausted_error(self):
             res.append("- Ask for smaller changes in each request.")
             res.append("- Break your code into smaller source files.")
             if "diff" not in self.main_model.edit_format:
-                res.append(
-                    "- Use a stronger model like gpt-4o, sonnet or opus that can return diffs."
-                )
+                res.append("- Use a stronger model that can return diffs.")
 
         if input_tokens >= max_input_tokens or total_tokens >= max_input_tokens:
             res.append("")