GPT-5.4 mini, OpenAI's fastest variant of GPT-5.4, is now generally available in GitHub Copilot. The model claims to be the highest-performing mini offering for coding tasks.
GPT-5.4 mini introduces major improvements in coding, reasoning, and computer control capabilities over GPT-5 mini. Model runs over 2x faster and achieves near-full-GPT-5.4 performance on multiple benchmarks while consuming 30% of quota in agentic systems.
OpenAI has released GPT-5.4 mini and GPT-5.4 nano, compact models optimized for coding and subagent tasks. The new models deliver significant performance improvements—GPT-5.4 mini reaches 54.4% on SWE-Bench Pro versus 45.7% for GPT-5 mini—but cost 3-4x more per input token than their predecessors.
OpenAI has released GPT-5.4 mini, the lightweight variant of its agentic coding model GPT-5.4, in GitHub Copilot. The model represents OpenAI's highest-performing mini offering to date for code generation and completion tasks.