GPT-4o mini
OpenAI's successor to GPT-3.5 turbo
GPT-4o mini scores 82% on MMLU and currently outperforms GPT-4 on chat preferences. It is priced at 15¢/million input tokens and 60¢/million output tokens, an order of magnitude more affordable than previous frontier models and 60+% cheaper than GPT-3.5 Turbo.