OpenAI LLM Light Closed weights

GPT-5 nano

462 days since OpenAI announced it · 7 Aug 2025

GPT-5 nano is a closed-weights LLM from OpenAI, announced 7 Aug 2025. It costs $0.05 per 1M input tokens and $0.40 per 1M output tokens. Its context window is 400K tokens.

Input: $0.05; per 1M tokens
Cache write: —; per 1M tokens
Cache read: $0.01; per 1M tokens
Output: $0.40; 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-nano

Our coverage

We haven’t written about GPT-5 nano yet.

OpenAI · Light

closed weights

GPT-6 Luna +75d 22 Sep 2026
GPT-5.6 Luna +114d 9 Jul 2026
GPT-5.4 nano +222d 17 Mar 2026
GPT-5 nano 7 Aug 2025