GPT-4o mini: advancing cost-efficient intelligence

OpenAI released GPT-4o mini on July 18, 2024 at $0.15 per 1M input tokens and $0.60 per 1M output tokens, replacing GPT-3.5 in ChatGPT. It supports text and vision, offers a 128K context window and 16K max output, scores 82.0% on MMLU and 87.2% on HumanEval. The key detail for builders is that its API version is the first to use instruction hierarchy against jailbreaks and prompt injection.

Why it matters: This is a substantive OpenAI model launch, not a minor refresh: GPT-4o mini adds $0.15/$0.60 pricing, 128K context, 16K max output, benchmark details, and instruction hierarchy, then replaces GPT-3.5 in ChatGPT. HKR-H/K/R all pass, so it lands in P1.