The latest models for ChatGPT users and developers using OpenAI’s API are designed to be workhorses, built for tasks like vibe coding, where big, powerful AI models are expensive overkill. GPT-5.4 mini and nano, which OpenAI released Tuesday, are the smallest and fastest versions of GPT-5.4, which debuted earlier this month.
These new models are part of an effort by OpenAI to lean into coding as it battles with rival Anthropic for the AI software engineering market. OpenAI’s latest models for its Codex coding software have directly challenged Anthropic’s Claude Code, which went viral at the end of 2025 for its ability to create apps from scratch.
Disclosure: Ziff Davis, CNET’s parent company, in 2025 filed a lawsuit against OpenAI, alleging it infringed Ziff Davis copyrights in training and operating its AI systems.
OpenAI says GPT-5.4 mini is more than twice as fast as its predecessor, GPT-5 mini, at
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