GPT-5 mini

GPT-5 mini launched alongside GPT-5 on August 7, 2025 as the mid-tier of OpenAI's unified reasoning family, inheriting the same adaptive router and multimodal architecture at a lower inference cost. It targets high-volume production workloads where full GPT-5 is overkill but frontier-adjacent reasoning still matters.\n\nPricing is $0.25 per million input tokens and $2.00 per million output tokens with a 400K-token context window. Benchmark reports place its math and coding performance solidly above smaller tiers while remaining far cheaper than the flagship. Like all GPT-5 family members it is API-only with no public weights.