OpenAI LLM Medium Closed weights

GPT-5 mini

462 days since OpenAI announced it · 7 Aug 2025

GPT-5 mini is a closed-weights LLM from OpenAI, announced 7 Aug 2025. It costs $0.25 per 1M input tokens and $2 per 1M output tokens. Its context window is 400K tokens.

Input: $0.25; per 1M tokens
Cache write: —; per 1M tokens
Cache read: $0.03; per 1M tokens
Output: $2; per 1M tokens
Context window: 400K; tokens
Parameters: —; not disclosed

Announcement: openai.com/index/introducing-gpt-5-for-developers
Docs: developers.openai.com/api/docs/models/gpt-5-mini

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OpenAI · Medium

closed weights

A new one every ~75 days — due in ~58d.

GPT-6.1 Terra +27d 26 Oct 2026
GPT-6.1 Sol +7d 29 Sep 2026
GPT-6 Sol +75d 22 Sep 2026
GPT-5.6 Terra +0d 9 Jul 2026
GPT-5.6 Sol +114d 9 Jul 2026
GPT-5.4 mini +222d 17 Mar 2026
GPT-5 mini 7 Aug 2025