GPT5.6 Gets Its Brain Cut Out! Will Fable 5 Come Back as a Nerfed “Weakling” Version?

Yesterday, OpenAI's strongest series, GPT-5.6, was suddenly launched.

However, GPT-5.6 is split into three forms:

GPT-5.6 Sol: Next-generation frontier model,

GPT-5.6 Terra: A balanced model for efficient daily work,

GPT-5.6 Luna: A fast and economical model for high-throughput tasks.

But the release rights for the strongest GPT-5.6 Sol are no longer in the hands of OpenAI's Altman, but on the "approved list."

Before OpenAI bowed its head, Anthropic had just experienced a "ban crisis": Except for some partner institutions, Fable 5 is globally disabled.

In the era of algorithmic rationing, GPT-5.6 suffers a lobotomy

In the past, products were recalled after issues arose; this time, the product hasn't even left the door but is stopped at the entrance.

According to the source, OpenAI was asked to limit the release scope of GPT-5.6.

The reason is to hold back the strongest few until the nationwide AI security framework is implemented.

According to leaks, this intervention was due to GPT-5.6 possessing "Mythos-like" capabilities, rather than suddenly adopting a tougher enforcement approach.

After careful consideration, OpenAI decided to restrict access to the latest AI model, allowing only a limited number of users to preview GPT-5.6.

The vast majority of ChatGPT users will still need to wait several weeks for GPT-5.6 to be gradually unblocked.

Mythos 5 is scary! Will the return of Fable 5 be a weak version?

Before OpenAI bowed its head, another giant, Anthropic, had just gone through a crisis.

Two weeks ago, Anthropic released the myth-level AI model Fable 5.

However, this model only survived on the shelves for 72 hours before being violently taken down.

Because of fear. Fable 5's network attack capability is frightening.

U.S. House Representative Andrew Garbarino expressed this.

In a closed-door demonstration, Anthropic Mythos displayed astonishing threats to the software security world, such as even being able to empty private bank accounts.

Andrew Garbarino said:

Anthropic instructed the model to find vulnerabilities in the banking system and empty accounts, and it executed the task.

Subsequently, Mythos "also found the vulnerability and fixed it."

This is an unprecedented "pull the plug" operation in human history.

Only recently, Mythos 5 was allowed to be opened to a very small number of "trusted partners" under "shackles."

According to the latest reports: The "castrated version" of Mythos 5, Fable 5, is expected to return and go online next week.

However, Fable 5 may be severely neutered to ensure safety guardrails are more robust.

When Fable 5 was first released, users discovered that simply saying the word "cancer" would get them blocked by Claude.

If guardrails are strengthened further, the user experience could become a nightmare.

Shopify CTO Mikhail Parakhin conducted in-depth tests on Fable 5 and GPT-5.6 Max.

He believes that Anthropic's absolute advantage is gone; GPT-5.6 has caught up with Claude Mythos.

GPT-5.6 is significantly better than Opus 4.8 in all aspects (also slightly faster, depending on the load).

Compared to Fable 5, it is notably inferior in coding but performs better on agent workloads.

This is a rare real comparison between Fable 5 and GPT-5.6, but it is enough to show that Anthropic cannot rest easy.

If Fable 5 returns only in a castrated version, it undoubtedly leaves more opportunities for competitors to catch up.

Are you buying a genius or a puppet?

What worries developers most is not just "can't buy it," but "the product doesn't match the description."

In the AI circle, a term is spreading like a virus: "Lobotomized."

To pass the numerous and complex safety reviews, AI giants have to install layers of reinforced "guardrails" on their models.

But intelligence often arises from chaos and freedom.

When you forcibly neuter a model's ability to explore underlying code, encryption algorithms, and even deep logic, what you get may no longer be an omniscient "Sol," but a mediocre "Luna" with clipped claws, timid and submissive.

What you want is "Prometheus's fire," but the U.S. only allows you to export "lighters."

Developers generally fear that models will be heavily reinforced with guardrails, or even "lobotomized", with abilities neutered and severely dumbed down.

Worse, it may be restricted to use within the U.S., or require strict identity verification, rather than the promised "broad, pay-to-use" model.

And then there's the money issue.

Initially, Anthropic provided Fable 5 for free in multiple paid Claude subscriptions, open until June 22, giving users a brief window to experience its power—then access disappeared.

Now, no one can say: Will subscribers still get back the promised "free use"? Or when it returns, will it be locked behind additional fees or identity verification?

Perhaps soon, we will look back fondly on the spring of 2023. Back then, as long as you had an email address, you could command "god-like AI."

Source: Silicon Star Pro

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