OpenAI LLM Medium Closed weights

GPT-6 Sol

51 days since OpenAI announced it · 22 Sep 2026

GPT-6 Sol is a closed-weights LLM from OpenAI, announced 22 Sep 2026. It costs $2 per 1M input tokens and $10 per 1M output tokens. Its context window is 1.05M tokens.

Input: $2; per 1M tokens
Cache write: $2.50; per 1M tokens
Cache read: $0.20; per 1M tokens
Output: $10; per 1M tokens
Context window: 1.05M; tokens
Parameters: —; not disclosed

Announcement: openai.com/index/introducing-gpt-6-sol-and-luna
Docs: developers.openai.com/api/docs/models/gpt-6-sol

Our coverage

1 story

GPT-6 Sol and Luna halve OpenAI's prices
19 Oct 2026

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

GPT-6 Sol and Luna halve OpenAI's prices