GPT-6 Sol and Luna: From Rumor to Release

Episode 1 · GPT-6 Sol/Luna and Aeon Agent Rumors Surge Amid Technical Leaks, No Official Confirmation (2026-09-21, 33 posts)

During Sep 21–23, rumors about OpenAI's next-gen GPT-6 (Sol/Luna variants) and the persistent agent Aeon converged from multiple anonymous leaks and community evidence: Azure config files, Sub2API response metadata, and Codex code fields were cited as technical corroboration, and on Sep 23 users claimed both versions were already grey-rolling out in ChatGPT with up to 6x Astra's speed. Yet debunker TokenGremlin refuted claims like a "Tuesday launch." Nothing is officially confirmed and the picture is mixed.

Confirmed

• scaling01 teased GPT-6-Luna and GPT-6-Sol as coming "soon," later hinting an "Azure slip" exposed the names, and added Qwen4 is "quite close" too.
• kimmonismus relayed leaker bridgemindai that GPT-6 Sol, GPT-6 Luna, and GPT-6 "Astra Minor" appeared overnight in Microsoft Azure config files, with GPT-5 series changes in the same commit; Reddit users posted screenshots of the same three entries.
• imjustnewatai shared a Sub2API screenshot where a request sent as gpt-5.6-sol returned response.model = gpt-6-sol upstream, triggering a Model mismatch warning; the community inferred grey-testing of a new model.
• Developer ChrisGPT found numerous Aeon persistent-agent fields in shipped Codex code, such as aeonModelId and allowAeonDraftModelSelection.
• TokenGremlin debunked the "GPT-6 Sol launches Tuesday" claim—no well-informed leaker confirmed a date—calling it a distilled, cheaper Astra.

Unconfirmed

• danielmac8's relay claims the Terra tier is being cut; repligate's version says Sol may join Terra and Luna as a trio, and that OpenAI is doing RL training for 6.1 codenamed Astra.
• haider1's version: GPT-6 sol sits between GPT-5.6 sol and GPT-6 astra in capability with far fewer tokens and Gemini 3.8 Flash-level efficiency; other leaks cite pricing of $2.50/$15, half of GPT-5.6 Sol.
• imjustnewatai and YassMob relayed rumors of a Tuesday launch and an internal "Bel" model deemed AGI-level—exactly what TokenGremlin debunked; ChrisGPT relayed a "Sol launches today, before Aeon" version.
• On Sep 23, kimmonismus said multiple users reported Sol and Luna grey-rolling out in ChatGPT, promising benchmarks once granted access; basedjensen relayed claims of grey testing with up to 6x Astra's speed at equal reasoning effort, plus a group-chat agent preview. Neither has official confirmation.
• Aeon rumors are dense but unofficial: possible launch this week or Thursday morning, built with GPT-Astra, an always-on "ChatGPT's answer to Grok Bot"; The Information (via dotey) reports OpenAI is rushing a "Codex Bot"; some speculate a DevDay reveal.
• Multiple posts claim Anthropic counter-upgrades (Fable, Opus, Sonnet 5.5 at discount; Haiku possibly discontinued), read as a preemption strategy.

Why it matters

If the halved pricing holds, GPT-6 Sol could sharply cut unit costs and spark a price war. The Azure, Sub2API, and Codex evidence lends technical plausibility, and the fresh "grey rollout, 6x speed" claims strengthen near-launch speculation—but still without firsthand proof. TokenGremlin's debunking shows the leak ecosystem contradicts itself on timing and positioning, and claims like "Bel is AGI" look like hype. Aeon vs. Grok Bot and Anthropic's parallel upgrades signal an intense escalation cycle; all information comes from anonymous accounts and unverified media relays, so treat with caution.

• Rumor: GPT-6 Sol Lands Tuesday, Internal 'Bel' Deemed AGI; Opus 5.5 May Drop Monday — imjustnewatai · 2026-09-21
• Rumor: OpenAI to launch GPT-6 Sol Tuesday, cheaper and smarter, aided by internal 'AGI' model Bel — YassMob · 2026-09-21
• GPT-6 sol increasingly rumored for next-week launch: faster, cheaper, between 5.6 and 6 astra — haider1 · 2026-09-21
• Leaker debunks GPT-6 Sol rumors: no launch date, a distilled cheap variant of Astra — i_dg23 · 2026-09-21
• Rumor: GPT-6-Sol Due Tuesday, Opus 5.5 This Week, 'Bel' Called AGI Internally — CurieuxExplorer · 2026-09-21
• Rumor: Opus 5.5 and GPT-6 Sol dropping tomorrow, but this poster bets nothing beats Astra — patience_cave · 2026-09-21
• Scoop: OpenAI preps GPT-6 Sol and Luna launch as Anthropic nears Opus 5.5 — daniel_mac8 · 2026-09-21
• OpenAI reportedly building new features to rival Grok Bot's growing popularity — Polymarket · 2026-09-21
• OpenAI builds its answer to Grok Bot; researchers nervous about AI progress — steph_palazzolo · 2026-09-22
• OpenAI's rumored 'Aeon' is a persistent reasoning mode that runs until the task is done — imjustnewatai · 2026-09-22
• Rumored OpenAI reasoning mode "Aeon" would persist until the task is done — imjustnewatai · 2026-09-22
• GPT-6 Sol rumored to launch Tuesday at half price as Anthropic readies Opus 5.5 counterpunch — 新智元 · 2026-09-22
• Rumors swirl of OpenAI unveiling a Grok bot rival at DevDay — imjustnewatai · 2026-09-22
• GPT-6-Luna and GPT-6-Sol rumored imminent, names possibly leaked via Azure — scaling01 · 2026-09-22
• Azure "oopsie" reportedly leaks GPT-6-Luna and GPT-6-Sol names — scaling01 · 2026-09-22
• Rumor: GPT-6-Luna and GPT-6-Sol imminent, Qwen4 'pretty close' too — scaling01 · 2026-09-22
• Leak hints GPT-6 Sol may already serve some GPT-5.6 Sol traffic — imjustnewatai · 2026-09-22
• GPT-6 Sol may already be live in shadow traffic, API mismatch screenshots suggest — imjustnewatai · 2026-09-22
• Leak: GPT-6 to split into Sol and Luna as community begs Anthropic to keep Haiku 4.5 on API — repligate · 2026-09-22
• Codex code leak reveals Aeon, OpenAI's rumored persistent agent, launch may be imminent — ChrisGPT · 2026-09-22

13 more related posts →

Episode 2 · GPT-6 Sol and Luna surface in Codex code and interfaces (2026-09-22, 4 posts)

GPT-6 appears to be rolling out quietly: internal codenames are shifting to gpt-6-sol and gpt-6-luna, with pricing found in Codex code and users spotting the models in the CLI and web versions, though availability remains inconsistent and confusing.

• Codex code leak hints at GPT-6 Luna with pricing already in place, alongside GPT-6 Sol — haider1 · 2026-09-22
• GPT-6 "Luna" spotted in Codex, but "Sol" is missing — Angaisb_ · 2026-09-23
• GPT-6 Sol and Luna appear in Codex CLI but are missing from the VS Code extension — nambirseyr · 2026-09-23
• Leak: OpenAI models being upgraded to gpt-6-sol and gpt-6-luna internally — FlolightC · 2026-09-23

Episode 3 · OpenAI Launches GPT-6 Sol and Luna Across API, Codex and ChatGPT Work (2026-09-23, 11 posts)

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.

• 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
• 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
• 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

Episode 4 · Rumors Swirl Over OpenAI's GPT-6 Astra Minor (2026-09-23, 3 posts)

Unverified leaks suggest OpenAI is preparing GPT-6 Astra Minor, a model seen as a Claude Opus 5.5 rival that appears as a supported mainline model in Daybreak docs, possibly bridging Sol and Astra. One reading argues Sol wasn't beaten by Opus 5.5 but is a renamed Terra, which saw far lower usage than Luna and Astra.

• Rumor: OpenAI's updated Daybreak docs list GPT-6 Astra Minor as a mainline model, possibly a cheaper Astra variant — brandon_galang · 2026-09-23
• Rumor: OpenAI's GPT-6 'Astra Minor' is the new Sol, replacing Terra — daniel_mac8 · 2026-09-23
• Analyst argues GPT-6 Sol is renamed GPT-5.6 Terra, not a response to Opus 5.5 — brandon_galang · 2026-09-24