diff --git a/aider/models.py b/aider/models.py
new file mode 100644
index 000000000..82839f946
--- /dev/null
+++ b/aider/models.py
@@ -0,0 +1,36 @@
+class Model_GPT4_32k:
+    name = "gpt-4-32k"
+    max_context_tokens = 32 * 1024
+
+
+GPT4_32k = Model_GPT4_32k()
+
+
+class Model_GPT4:
+    name = "gpt-4"
+    max_context_tokens = 8 * 1024
+
+
+GPT4 = Model_GPT4()
+
+
+class Model_GPT35:
+    name = "gpt-3.5-turbo"
+    max_context_tokens = 4 * 1024
+
+
+GPT35 = Model_GPT35()
+
+
+def get_model(name):
+    models = [
+        GPT4_32k,
+        GPT4,
+        GPT35,
+    ]
+
+    for model in models:
+        if model.name == name:
+            return model
+
+    raise ValueError(f"Unsupported model: {name}")