Adding gpt-4o to pricing (microsoft#2674)

Co-authored-by: Chi Wang <[email protected]>

Author: r4881t

autogen/oai/openai_utils.py

@@ -17,6 +17,9 @@
 DEFAULT_AZURE_API_VERSION = "2024-02-15-preview"
 OAI_PRICE1K = {
     # https://openai.com/pricing
+    # gpt-4o
+    "gpt-4o": (0.005, 0.015),
+    "gpt-4o-2024-05-13": (0.005, 0.015),
     # gpt-4-turbo
     "gpt-4-turbo-2024-04-09": (0.01, 0.03),
     # gpt-4