OpenAI: GPT-5.4 Mini

GPT-5.4 Mini is a paid OpenAI model that accepts text, image, and file inputs. It offers a 400,000-token context window and can return up to 128,000 tokens in a single completion, which suits long documents and lengthy generated outputs. It supports tool calling and reasoning. The available facts do not confirm structured output support or open weights, so treat both as unconfirmed. At $0.75 per million input tokens and $4.50 per million output tokens, output costs six times as much as input. That makes the model cheaper to run on input-heavy work, such as analyzing large files, than on long generations. Teams that need multimodal input, tools, and a large context at this price point may want to shortlist it. It has no independent benchmark coverage yet, so its performance is unproven against alternatives. Buyers should run their own evaluations before committing.