An X account with a record of calling frontier model releases early said on Thursday that OpenAI is preparing to ship Astra, its unreleased next model, as soon as next week. The post came from leo, who writes on X as @synthwavedd, and it is the first specific launch window to circulate for a model OpenAI has publicly described only as "our next major model."
Traders moved within the hour. A Polymarket contract on whether Astra reaches the general public by August 15 had sat near 10% for most of Thursday. After the post spread it spiked as high as 42% before settling at 32%, on $6,942 of volume against that single date. The market still treats a launch next week as unlikely, and OpenAI has confirmed no date, no price, and not even a final product name.
Astra matters because of how tight the race at the top has become. Claude Fable 5, from rival Anthropic, holds a narrow lead on the Artificial Analysis Intelligence Index, an independent composite score, at roughly 60 points to 59 for OpenAI's flagship GPT-5.6 Sol. Neither company can claim a decisive lead, and Astra is the model OpenAI is expected to answer with.
The name became public on Saturday, August 1, when OpenAI published a research post crediting an internal version of Astra with new results on ten open math problems, each of which had resisted progress for at least a decade. The company put the token cost of producing all ten at about $2,000. The Information first reported the model's existence in late July, saying OpenAI had tentatively settled on the Astra name and that Sam Altman had demonstrated it to policymakers in Washington.
What a new pretrain would mean
The line in leo's post that matters most to anyone tracking OpenAI's roadmap describes Astra as "the largest model OpenAI have trained since GPT-4.5." Pretraining is the expensive first stage of building a model, where the system learns from an enormous body of text; everything after that is comparatively cheap refinement. OpenAI's releases since GPT-5 arrived a year ago have mostly been refinements of existing bases, shipping every few weeks. GPT-4.5, released in February 2025, was the last time the company started over with a much bigger one, and it proved so costly that OpenAI removed it from its developer API within five months. If the claim holds, Astra is not another point release. It is the first time in roughly 18 months that OpenAI has bet on raw scale again.
The post also names the specific build. The most recent version circulating inside the company for staff testing, known internally as "mewfour," is described as the release candidate, meaning the version a company intends to ship unless late testing turns up a problem. A separate X account, M1, posted on Wednesday that mewfour had entered testing this week.
The federal review that could push the date
The largest obstacle is in Washington. The Information reported that Astra is expected to be among the first models submitted under a new federal review framework, which gives government agencies up to 30 days with a model before public release to measure what it could do in a cyberattack. The framework, tied to an executive order President Trump signed on June 2, was presented to company staff on Tuesday, and participation is voluntary. If OpenAI handed Astra over around the August 1 announcement, a 30-day window would close near the end of the month. The same market's August 31 line was priced above 50%, right where that math lands.
There are reasons for caution beyond the calendar. leo is a leaker, not a news organization, and the post names no sources. Under $7,000 has traded on the August 15 contract, so the jump reflects a small number of participants rather than a deep market. Other accounts have already relabeled the leak as "GPT-6," a term the post itself never uses; The Information reported that OpenAI had not decided whether Astra ships as GPT-6, as a variant inside the GPT-5 line, or under the Astra name alone.
OpenAI has run this play before, seeding a model's name inside a research paper and letting anticipation do the marketing. What is different this time is that the leak arrived with a date attached, and money moved on it within the hour. Next week will settle whether that was a scoop or a guess.