ChatGPT Free Tier upgraded to GPT-5.4 mini (faster responses + improved performance)

Key Upgrade to Free Users

Free users of ChatGPT now enjoy enhanced functionality with access to GPT-5.4 mini, our most advanced model iteration yet. Its optimized performance significantly elevates everyday use.

GPT-5.4 mini boasts a wide range of benefits, encompassing superior reasoning, coding, and overall output quality.

To begin exploring GPT-5.4 mini:

• GPT-5.4 mini is instantly accessible to free users, alternatively you may opt to engage in “Thinking” mode via the + menu depending on your selected task or preferences.

• Note: For premium users, GPT-5.4 mini operates as a backup system when the GPT-5.4 usage limit is reached.

The developers of ChatGPT have carefully crafted GPT-5.4 mini for efficient large-scale projects, marrying the power of our flagship model with rapid processing capacity.

In comparison to its predecessor, GPT-5.4 mini has shown a substantial enhancement in key areas, particularly in coding, reasoning, and tool use, with execution speeds more than doubling. Its performance demonstrates marked similarity to its larger counterpart in various assessment criteria, such as SWE-Bench Pro and OSWorld-Verifi...