OpenAI o4-mini is a fast, cost-efficient o-series reasoning model with strong performance across coding and visual tasks, succeeded by GPT-5 Mini for new workloads. Supports a 200,000-token input context with 100,000 output tokens, accepts text and image inputs, and exposes streaming, function calling, structured outputs, and reasoning tokens across Chat Completions, Responses, Realtime, Batch, Fine-tuning, and Assistants APIs. Priced at $1.10 / $4.40 per 1M input/output tokens.
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