GPT-5.4 mini brings some of the smarts of OpenAI's latest model to ChatGPT Free and Go users
Key Points
- OpenAI released GPT-5.4 mini and nano following the launch of GPT-5.4 in March.
- GPT-5.4 mini is available to Free and Go ChatGPT users via the "Thinking" menu.
- Paid users see mini as a fallback when the main GPT-5.4 model hits rate limits.
- Mini offers reasoning, multimodal understanding, and tool‑use performance close to full GPT-5.4.
- Mini runs more than twice as fast as its predecessor, GPT-5.0 mini.
- GPT-5.4 nano targets data classification and extraction tasks with speed and cost efficiency.
- Nano is accessible only through OpenAI's API, not the chatbot interface.
- Pricing for GPT-5.4 nano starts at $0.20 per million input tokens.
OpenAI has expanded its GPT-5.4 family with two new variants—GPT-5.4 mini and GPT-5.4 nano. The mini model is now accessible to Free and Go ChatGPT users via the "Thinking" menu and serves as a fallback for paid users who hit rate limits. It delivers reasoning, multimodal understanding, and tool‑use capabilities that approach the full GPT-5.4 while running more than twice as fast. The nano model is targeted at data‑classification and extraction tasks, offered exclusively through the API at a cost‑effective price of $0.20 per million input tokens.
Background
At the beginning of March, OpenAI introduced GPT-5.4, a model primarily aimed at professional workloads such as programming and data analysis. Building on that foundation, the company announced two additional variants designed to broaden accessibility and address specific use cases.
New Model Variants
OpenAI’s latest rollout includes GPT-5.4 mini and GPT-5.4 nano. While both are part of the same generation, they serve different audiences and purposes. The mini model is positioned for general‑purpose users, whereas the nano model targets developers needing fast, cost‑efficient processing for data‑centric tasks.
GPT-5.4 Mini Features
GPT-5.4 mini is now reachable by users on OpenAI’s free tier and the Go plan. Access is provided through the "Thinking" option in the ChatGPT interface. For paid subscribers, the mini model also functions as an automatic fallback when the primary GPT-5.4 model reaches its rate limit.
The mini variant delivers performance that closely mirrors the full GPT-5.4 in several key areas. It shows improved reasoning ability, enhanced multimodal understanding—including better parsing of images and audio—and more nuanced tool use such as web searching. Importantly, it operates more than twice as quickly as its predecessor, GPT-5.0 mini, delivering faster responses without sacrificing quality.
GPT-5.4 Nano Features
GPT-5.4 nano is engineered for tasks where speed and cost efficiency are paramount, such as data classification and extraction. Unlike the mini model, nano is not available within the ChatGPT chatbot interface; it is offered exclusively through OpenAI’s API service.
The design intention behind nano is to enable developers to embed advanced AI capabilities into autonomous agents or pipelines that require rapid, inexpensive processing of large volumes of text.
Availability and Pricing
While GPT-5.4 mini can be selected directly in the ChatGPT UI by free and Go users, GPT-5.4 nano remains an API‑only offering. OpenAI has set the starting price for the nano model at $0.20 per million input tokens, reflecting its focus on high‑throughput, low‑cost applications.
Overall, the introduction of these two variants expands OpenAI’s model ecosystem, giving a broader range of users—both casual conversational users and developers building specialized AI solutions—access to capabilities that were previously limited to higher‑tier offerings.