OpenAI Launches GPT-6 Sol and Luna Across API, Codex and ChatGPT Work
On September 23, OpenAI released two new GPT-6 models, GPT-6 Sol and GPT-6 Luna. After early leaks from TestingCatalog, the official OpenAI Devs account confirmed both models are available in the API and rolling out to Codex and ChatGPT Work for Plus, Pro, Business and Enterprise users. It is a rare same-day dual launch; specs, pricing and benchmarks remain unpublished.
Confirmed
- The OpenAI Devs account announced GPT-6 Sol and GPT-6 Luna are available in the API and rolling out via Codex and ChatGPT Work to Plus, Pro, Business and Enterprise users.
- TestingCatalog earlier reported the rollout across ChatGPT, Codex and API with screenshots.
- Multiple users including markk, danielmac8 and kimmonismus found both models in Codex/Work model pickers; scaling01 posted a screenshot confirming the names appear in the interface.
- Leak account Andrew Curran (via rickasaurus) described a same-day dual launch with rollout underway.
- Screenshots circulating (via airesearch12) suggest separate usage quotas for Sol and Luna in Codex, unverified officially.
- A widely shared post (via mayanicks0x) claims the models are faster, cheaper, and inherit Astra's SOTA gains in professional work, factuality, coding, computer use and alignment — not confirmed by official channels.
Unconfirmed
- No official specs, capability differences, pricing or benchmarks; kimmonismus promised benchmarks once obtained.
- The Sol/Luna naming (also leaked separately by reachvb), tiered quotas, and the "faster and cheaper, inherits Astra" claims rest on personal accounts pending official details.
Why it matters
- A rare same-day dual flagship launch marks the GPT-6 generation debuting in two variants, directly affecting ChatGPT, Codex and the API ecosystem. Upcoming benchmarks and pricing will clarify the positioning split between Sol and Luna.
2026-09-23 ~ 2026-09-23 · 11 related posts
- Episode 1: GPT-6 Sol/Luna and Aeon Agent Rumors Surge Amid Technical Leaks, No Official Confirmation(2026-09-21, 33 posts)
- Episode 2: GPT-6 Sol and Luna surface in Codex code and interfaces(2026-09-22, 4 posts)
- Episode 3: OpenAI Launches GPT-6 Sol and Luna Across API, Codex and ChatGPT Work(2026-09-23, 11 posts)
- Episode 4: Rumors Swirl Over OpenAI's GPT-6 Astra Minor(2026-09-23, 3 posts)
Primary sources
- [source] GPT-6 Sol and Luna spotted in OpenAI Codex, release imminent — mark_k · 2026-09-23
- GPT-6 Sol and GPT-6 Luna Appear in Codex Model Picker, Official Reveal Imminent — daniel_mac8 · 2026-09-23
- GPT-6 Sol and GPT-6 Luna are rolling out, OpenAI announcement imminent — rickasaurus · 2026-09-23
- [source] OpenAI reportedly rolling out GPT-6 Sol and GPT-6 Luna on ChatGPT, Codex, and APIs — testingcatalog · 2026-09-23
- Screenshot shows "GPT-6 Sol and Luna" appearing in the interface — scaling01 · 2026-09-23
- Report: OpenAI rolling out GPT-6 Sol and GPT-6 Luna — koltregaskes · 2026-09-23
- GPT-6 Sol and Luna already usable in Codex, early user reports — airesearch12 · 2026-09-23
- [source] OpenAI ships GPT-6 Sol and GPT-6 Luna to API, rolling out in Codex and ChatGPT Work — OpenAIDevs · 2026-09-23
- GPT-6 'Sol' and 'Luna' leak: faster, cheaper OpenAI models with Astra's SOTA advances — mayanicks0x · 2026-09-23
- Leaked Codex usage limits hint at GPT-6 Sol and Luna tiers (unverified) — airesearch12 · 2026-09-23
- Rumor: OpenAI's Next Model May Be Named GPT-6 Luna — reach_vb · 2026-09-23