GPT-4.1 mini is a compact, cost-efficient language model released by OpenAI in April 2025. Designed to replace GPT-4o mini, it provides a balance of intelligence and speed, offering improved performance in reasoning, coding, and instruction following while significantly reducing operational costs. It is optimized for high-volume tasks and real-time applications that require low latency.
The model features a substantially expanded context window of 1,047,576 tokens, a eight-fold increase over the previous GPT-4o architecture. This capacity allows for the processing of very large documents, entire codebases, and long-form conversational histories. GPT-4.1 mini is multimodal, supporting both text and image inputs, and it can generate up to 32,768 tokens in a single response.
In terms of efficiency, GPT-4.1 mini is reported to be approximately 50% faster than GPT-4o with an 83% reduction in input token costs. It is frequently utilized as a fallback or high-speed alternative for tasks that do not require the full reasoning capabilities of larger flagship models.