OpenAI employee William Fedus confirmed that the mysterious chatbot "gpt-chatbot" appearing on the Chatbot Arena leaderboard is a pre-release version of the newly launched GPT-4o model. The model achieved the highest score ever recorded on the platform during these secret tests.

  • OpenAI tested multiple versions of GPT-4o in the arena starting in April, using aliases such as "gpt2-chatbot" and "im-also-a-good-gpt2-chatbot".
  • Upon release, GPT-4o surpassed previous top models Claude 3 Opus and GPT-4 Turbo by a significant margin of approximately 50 Elo points.
  • As of press time, the test model held an Elo score of 1309, compared to 1253 for GPT-4-Turbo-2023-04-09 and 1246 for Claude 3 Opus.

The official LMSYS account noted that the public version of GPT-4o has now entered the arena and will soon appear on the public leaderboard.