OpenAI o4‑mini is OpenAI’s lightweight reasoning model engineered for fast, affordable performance without sacrificing problem‑solving depth. It handles both text and image input and applies step‑by‑step reasoning when needed, while keeping mistakes low. It excels on math, financial, and visual reasoning tasks with speed and cost significantly under larger models. You can drop in receipts or charts to extract key information, upload meeting or survey notes for structured summaries, or ask for pricing comparisons and action plans with custom reasoning.