Leaks suggest Anthropic may be testing a model called Fable 5.5 while OpenAI may be developing GPT-6.2 Astra, although neither company has confirmed either model.

The evidence consists of a deleted Anthropic catalog entry and an unusual label found in OpenAI usage data. Anthropic is also in the middle of an IPO process, with its roadshow unable to begin before November 10.

What the leaks show

An Anthropic catalog entry for “Fable 5.5” appeared on October 13, 2026, and was removed the following day.

The OpenAI reference emerged through Codex, the company’s coding product. Some accounts showed a “2-astra” label in Codex usage data on November 1, 2026. The wording is consistent with the name of OpenAI’s current flagship model, GPT-6 Astra.

There are no independent benchmarks for Fable 5.5 or GPT-6.2 Astra. No one outside Anthropic or OpenAI has published performance figures, pricing details or release dates for either model. Accordingly, the available evidence does not establish whether either model exists as a product or how it would compare with its predecessor.

Recent releases from both companies

The rumored models would follow releases announced only months ago. Anthropic launched Fable 5 on June 9, 2026, describing it as the first model in its Mythos class.

OpenAI released GPT-6 Astra on September 3, 2026, less than three months after Fable 5. The model was priced at $10/$50 per million tokens, and OpenAI promoted its capabilities in cybersecurity and professional work.

Anthropic has also been updating its public filing documents. The company amended its S-1 filing for a Nasdaq listing on October 26 and again on November 2, 2026. The filings reported third-quarter revenue of $17.0 billion for the July-to-September 2026 period and stated that Anthropic holds $96 billion in cash.

Why the timing is significant

Companies preparing to go public generally have reasons to control the timing and content of product announcements. Statements made during an IPO process could be viewed as marketing directed at investors. That may help explain why Anthropic has not publicly discussed Fable 5.5, while the rapid removal of the catalog entry is consistent with a cautious approach.

The next significant date is November 10, the earliest day Anthropic’s roadshow can begin. Independent testing would provide the clearest way to assess the rumored models, but testers cannot evaluate Fable 5.5 or GPT-6.2 Astra until the companies make them available. No comparable public date has been announced for OpenAI, whose reference emerged through Codex usage data rather than a public filing.

Pricing will also be relevant. GPT-6 Astra’s $10/$50-per-million-token pricing provides a reference point, and any change in a potential 6.2 release could indicate whether OpenAI is prioritizing lower costs, greater capabilities or both.

Until Anthropic or OpenAI confirms additional information, Fable 5.5 and GPT-6.2 Astra remain the names of a removed listing and a label found in usage data.

Source: CryptoBriefing

Disclosure: This article was edited by Diego Almada Lopez. For information about how CryptoBriefing creates and reviews content, see its Editorial Policy.