Multiple leaks point to OpenAI's GPT-6 family with lightweight Sol possibly landing this week

Between September 15–17, multiple community sources converged on leaks that OpenAI is preparing new GPT-6 family models, with some signals already observable, though none officially confirmed. The story centers on a lightweight model codenamed "Sol," corroborated by several independent sources.

Confirmed

• Sam Altman publicly teased "big things this week, see you at DevDay" (relayed via 新智元's roundup).
• Several benchmark platforms have recently listed GPT-6 series model entries (per markk).
• Per 新智元's roundup, GPT-6-Sol has appeared in OpenAI's API routing list, with developers reporting noticeably faster speeds in testing.

Unconfirmed

• Reddit user Winter-Mix-5155 said the community has declared a "big release week" previewing new GPT-6 family models including GPT-6 Sol and smaller variants, while claiming the next flagship model has been slowed and may not ship in September.
• markk leaked that OpenAI would release "GPT-6 Sol" on Thursday; in follow-up discussion the community positioned Sol as a smaller, faster, cheaper version bringing agentic GPT-6 capabilities to ordinary users, dubbed a "mini-Astra for everyone."
• koltregaskes reported that the GPT-6 model codenamed Sol has quietly rolled out to some ChatGPT users, with an official launch possibly this week.
• haider1 claimed OpenAI plans a full GPT-6 line of Sol/Terra/Luna sizes, all distilled from Astra, with Astra released alone first to concentrate hype on a single model.
• soumitrashukla9 relayed rumors of both Sol and Luna versions shipping soon, attributing recent model behavior fluctuations to internal testing and traffic splitting 2–3 days before launch.
• 新智元's roundup indicated both GPT-6-Sol and Opus 5.2 could launch this month, with GPT-6-Sol positioned as low-cost.

Why it matters

If the leaks hold, this would be a multi-size GPT-6 family launch spanning multiple market positions, with Sol potentially bringing agentic capabilities to mass users at low cost and lighter weight, possibly alongside price cuts and stabilization after performance fluctuations. Multiple independent sources—Reddit, X, API routing observations, and gradual rollout reports—corroborate each other, and combined with Altman's public teaser, the coming week and DevDay merit close tracking.

2026-09-15 ~ 2026-09-17 · 7 related posts

• Rumor: OpenAI may soon release GPT-6 Sol and Luna versions — soumitrashukla9 · 2026-09-15
• [source] Rumor: OpenAI's GPT-6 Sol reportedly launching Thursday — mark_k · 2026-09-16
• Rumor: GPT-6 lineup of Sol/Terra/Luna sizes to be distilled from Astra, released one at a time — haider1 · 2026-09-16
• [source] Leaks claim GPT-6-Sol spotted in OpenAI API, could launch this month at lower cost — 新智元 · 2026-09-16
• Rumor: a big 'ship week' teased with GPT-6 family including GPT-6 Sol — Winter-Mix-5155 · 2026-09-16
• [source] Reports: GPT-6 'Sol' stealth-launched to some ChatGPT users, release due this week — koltregaskes · 2026-09-16
• Netizens speculate on rumored GPT-6 Sol as a lightweight 'mini-Astra' for agentic AI — mark_k · 2026-09-17