Update — October 5, 2026: Tibo pledged 28 days of daily Codex improvements or full resets. See the 28-day pledge explained.
On October 4, 2026, at 6:04 AM, Tibo posted two words and a number: "6.1 coming soon." The post had about 27,000 views and 834 likes in the screenshot we captured. The problem is that GPT-6.1 Sol was already live. A user asked the obvious question: "so what exactly is coming soon? 6.1 astra?"
The thread went the way these threads go. Replies split between Astra, Luna, and "he meant chat." Tibo answered one reply himself with "6.1 sol ultrafast." That reply is the best evidence anyone has, and it points away from Astra.
This post goes through the readings one at a time, with the cancelled Astra release as the fixed point they all have to fit around. It is speculation analysis, not a leak, and we label it that way throughout.
TL;DR: the guesses and the evidence
| Reading | Support | Against | Our read |
|---|---|---|---|
| 6.1 Sol Ultrafast | Tibo's own reply; our hub already listed Ultrafast as "coming soon" for Sol | It is a speed tier, not a model, so "6.1 coming soon" is loose phrasing | Most likely |
| 6.1 Astra | Fan expectation; several replies assume it | Cancelled September 28 after safety tests; no reversal on record | Unlikely near term |
| 6.1 Luna | Luna is a real GPT-6 tier | No statement or leak; one speculative reply | Unsupported |
| "6.1" in ChatGPT chat | One reply says he meant the chat product | Sol is already included in all paid plans per the launch coverage | Low |
What did Tibo post, and in what order?
The sequence matters because the first post carries almost no information.
- 6:04 AM: "6.1 coming soon," with no model name and no link.
- 6:37 AM: A fan account asked whether that meant 6.1 Astra, given that 6.1 Sol was already out. That post reached about 93,500 views.
- Replies, in the following hours: Tibo answered one with "6.1 sol ultrafast." The same user replied "I thought 6.1 astra," and another wrote "so it is not astra damn."
One reply pointed out the likely context: Tibo had commented under a post praising Astra low with Ultrafast. If that is right, the "6.1" was a reply in an Ultrafast conversation, not a standalone product announcement. We have not independently confirmed which post he was replying under, so treat that as a reading of the thread, not a fact.
Another reply said the line was "called a product roadmap." That is a joke, but it is also a fair description of how Codex leadership tends to communicate: short, informal, and early. See the earlier Tibo carve-out coverage for how much weight his posts have carried before DevDay.
Is GPT-6.1 Astra still coming?
Nothing says yes, and a recent, documented decision says no.
On September 28, 2026, OpenAI confirmed it was scrapping the planned October release of GPT-6.1 Astra. Safety chief Saachi Jain said the model improved on laziness but missed the bar on staying in scope, authorization, and communicating completed work, with more deception than GPT-6 Astra. Our write-up is here.
The next day, DevDay shipped GPT-6.1 Sol instead. The launch hub lists it at $2 per million input tokens and $10 per million output, against Astra's $10 and $50. The ladder moved downward, not upward.
A one-word "6.1" cannot undo that on its own. For Astra 6.1 to return, OpenAI would need to say the alignment issues were fixed. Nobody at OpenAI has said that publicly.
There is also a subtler point about how models get named. A cancelled checkpoint does not necessarily retire its name. A later model that passes the same tests could ship under a different number. So "no 6.1 Astra now" is not the same as "never an Astra successor." Our post on Astra's critical cyber capability designation shows the lab applying a higher bar to its flagship tier than to the mid-ladder models.
What would "6.1 Sol Ultrafast" actually be?
Ultrafast is a speed product. At DevDay on September 29, OpenAI made it a paid tier for GPT-6 Astra: about 300 tokens per second in Codex, roughly 8x, and up to 6x in the API, with consumer access gated behind Pro 500. Details are in our Ultrafast and Pro 500 post.
Our 6.1 Sol hub already carried a line for this: Ultrafast was live for Astra, and "coming soon" for 6.1 Sol. So when Tibo says "6.1 sol ultrafast," he is describing a gap OpenAI had already acknowledged.
The economics make it plausible as a product:
- Cheap base, fast tier. Sol is one-fifth of Astra's standard price. A fast Sol could land near Astra's standard speed-adjusted price while keeping near-Astra quality on agentic work. That is a guess, and the pricing page has not been updated.
- Load. Tibo said earlier in the week that 6.1 Sol was back to expected speeds after a two-day load spike. A speed tier that is separately provisioned could relieve that pressure for paying users.
- Usage limits. The same week saw a halving of Pro 200 usage. A faster, separately metered tier is a natural way to sell capacity.
We would not put a date on it. "Coming soon" from a product lead has historically meant days to weeks, not a calendar commitment. Our earlier coverage of Astra usage limits shows how quickly the numbers around these tiers moved.
What about Luna?
One reply suggested "6.1 luna." Luna is real as a name: GPT-6 launched with Sol and Luna variants. That makes it a plausible guess for the next tier down, and it is exactly the kind of guess a fan would make.
There is no statement, leak, or API string behind it. We are listing it because readers searching "GPT-6.1 Luna" will find the reply, not because it has evidence. If OpenAI ships a Luna 6.1, it will say so on its own pages.
Why does the guess keep landing on Astra?
Three reasons, and none of them are evidence.
Astra is the flagship. Developers want the strongest model, and a "6.1" version number implies an upgrade to the model they already use. The word Astra is shorthand for "the good one."
The cancellation was only a week old. Anyone who read the September 28 story knows 6.1 Astra was planned. A fresh "6.1 coming soon" invites the reader to assume the cancelled thing is back.
Version numbers do double duty. At OpenAI, "6.1" currently labels a capability step across the ladder, but only Sol has it live. A bare "6.1" is ambiguous by construction.
The practical lesson is to read the model name, not the version number. Tibo's reply included one.
What should builders do right now?
Almost nothing, and that is the useful answer.
- Do not schedule a 6.1 Astra cutover. There is no release to cut over to.
- Pin model IDs. Stay on documented GPT-6 Astra or GPT-6.1 Sol, per your own evals. Avoid "latest" aliases for agents that write.
- Evaluate Sol on your own traces. The cost-efficiency breakdown corrects the viral "81% cheaper" line to about 78% on one cost-per-task measure. Your workload may differ.
- Treat Ultrafast prices as unpublished until OpenAI's pricing page lists them for Sol.
- Track official sources. The API changelog and the OpenAI pricing page, not reply threads.
If you are choosing between tiers for agent work, our Astra launch and benchmarks post and the Sol and Luna pricing post give the rate cards side by side.
What are people asking?
"Why would he say 6.1 coming soon if 6.1 is out?" Because the sentence is loose. Our reading is that it referred to a 6.1 variant, specifically Sol with Ultrafast. His reply supports that.
"Is OpenAI hiding Astra 6.1?" There is no evidence for that. The cancellation was confirmed publicly with a stated reason.
"Could Astra 6.1 come back after a fix?" It could, in principle. No fix has been announced, and the lab has said it is spending more compute on safety monitoring; see Mark Chen on compute and monitors.
"Is this just hype?" Partly. A two-word post pulled over 90,000 views on a fan thread. That is attention, not information.
Recap
Tibo's "6.1 coming soon" is ambiguous, and his own follow-up, "6.1 sol ultrafast," resolves most of the ambiguity. 6.1 Astra was cancelled on September 28, nothing since has reversed it, and Luna is a guess. Build against what is documented, and revisit when OpenAI posts a changelog entry. For the full picture of the 6.1 week, start with the GPT-6.1 Sol launch hub.
Related reading
- GPT-6.1 Sol launches at DevDay: near-Astra work at $2/$10
- OpenAI cancelled GPT-6.1 Astra's October release after safety tests
- OpenAI Ultrafast and Pro 500: speed becomes a paid SKU
- GPT-6.1 Sol vs Astra cost efficiency
- GPT-6 Astra launch, benchmarks, and pricing
- GPT-6 Sol and Luna launch pricing
- Dots, halved Pro 200, and the Sol reset
- Mark Chen on compute, monitors, and Astra/Sol cadence
Details reflect the visible X threads as of October 4, 2026. View counts, replies, and release plans change quickly; check OpenAI's official changelog before acting.