diff --git a/aider/models.py b/aider/models.py
index a596c604dde..d6365d63fc0 100644
--- a/aider/models.py
+++ b/aider/models.py
@@ -19,47 +19,6 @@
 DEFAULT_MODEL_NAME = "gpt-4o"
 ANTHROPIC_BETA_HEADER = "prompt-caching-2024-07-31,pdfs-2024-09-25"
 
-OPENAI_MODELS = """
-gpt-4
-gpt-4o
-gpt-4o-2024-05-13
-gpt-4-turbo-preview
-gpt-4-0314
-gpt-4-0613
-gpt-4-32k
-gpt-4-32k-0314
-gpt-4-32k-0613
-gpt-4-turbo
-gpt-4-turbo-2024-04-09
-gpt-4-1106-preview
-gpt-4-0125-preview
-gpt-4-vision-preview
-gpt-4-1106-vision-preview
-gpt-4o-mini
-gpt-4o-mini-2024-07-18
-gpt-3.5-turbo
-gpt-3.5-turbo-0301
-gpt-3.5-turbo-0613
-gpt-3.5-turbo-1106
-gpt-3.5-turbo-0125
-gpt-3.5-turbo-16k
-gpt-3.5-turbo-16k-0613
-"""
-
-OPENAI_MODELS = [ln.strip() for ln in OPENAI_MODELS.splitlines() if ln.strip()]
-
-ANTHROPIC_MODELS = """
-claude-2
-claude-2.1
-claude-3-haiku-20240307
-claude-3-5-haiku-20241022
-claude-3-opus-20240229
-claude-3-sonnet-20240229
-claude-3-5-sonnet-20240620
-claude-3-5-sonnet-20241022
-"""
-
-ANTHROPIC_MODELS = [ln.strip() for ln in ANTHROPIC_MODELS.splitlines() if ln.strip()]
 
 # Mapping of model aliases to their canonical names
 MODEL_ALIASES = {
@@ -1143,9 +1102,9 @@ def fast_validate_environment(self):
         """Fast path for common models. Avoids forcing litellm import."""
 
         model = self.name
-        if model in OPENAI_MODELS or model.startswith("openai/"):
+        if model.startswith(("gpt-", "openai/")):
             var = "OPENAI_API_KEY"
-        elif model in ANTHROPIC_MODELS or model.startswith("anthropic/"):
+        elif model.startswith(("claude-", "anthropic/")):
             var = "ANTHROPIC_API_KEY"
         else:
             return