GPT-5.4 Mini

A lightweight variant of GPT-5.4 with a 400k token context window, released in March 2026 as a smaller and faster alternative within the GPT-5.4 series.

Strengths

Balances capability and speed, handling long-context tasks efficiently without the overhead of the larger GPT-5.4.

Best for

Applications where processing speed and cost efficiency matter more than maximum reasoning depth — document analysis, customer support, and moderate-complexity coding tasks.

Limitations

Lacks the advanced reasoning and specialized capabilities of GPT-5.4 Pro and GPT-5.5; not optimized for image analysis like GPT-5.4 Image 2 or multimodal tasks like GPT-5.5.