OpenAI releases GPT-6 Sol and GPT-6 Luna in its API

On September 22, 2026 OpenAI released GPT-6 Sol (gpt-6-sol) and GPT-6 Luna (gpt-6-luna), according to its API changelog, which describes them as reasoning models that accept text and image inputs and generate text through the Responses and Chat Completions APIs. OpenAI's announcement, as listed in its news feed, presents them as two models with different balances of capability and cost. In a separate changelog entry dated September 25, OpenAI says it fixed a bug in image encoding that degraded image understanding in both models, and recommends rerunning evaluations for use cases with image inputs. Both are hosted models; no release of weights is described. USASI has not tested them.12

USASI. (2026, October 13). OpenAI releases GPT-6 Sol and GPT-6 Luna in its API. United States of America Superintelligence. https://unitedstatesofamericasuperintelligence.com/news/openai-releases-gpt-6-sol-and-gpt-6-luna/

@misc{usasi_news_openai_releases_gpt_6_sol_and_gpt_6_luna,
  author = {{USASI}},
  title = {OpenAI releases GPT-6 Sol and GPT-6 Luna in its API},
  year = {2026},
  month = oct,
  howpublished = {\url{https://unitedstatesofamericasuperintelligence.com/news/openai-releases-gpt-6-sol-and-gpt-6-luna/}},
  note = {United States of America Superintelligence. Last updated 2026-10-13}
}