A reference to an unannounced Anthropic model, "Claude Mythos 5.5," reportedly appeared in the code of the company's web page before being pulled, while the visible page continued to show version 5.1.
Unannounced model reference · Anthropic
A "Claude Mythos 5.5" string surfaces in page code, then disappears
A reference to an unannounced model appeared in the underlying code of an Anthropic web page and was later removed, while the visible page still showed version 5.1. Anthropic has not announced the model, and no specifications, capabilities, pricing, or timing have been shared.
5.1
Version still shown on the public page
5.5
Version string seen in page code
0
Official announcements so far
Version numbers, shown as minor-version steps
Each block is one minor version step. The heights show the label, not performance.
The gap is four minor steps. It shows only how the labels differ, not what either version can do.
How the signal moved
Name appears in page code
→
Observers circulate the find
→
→
Official announcement needed
Read as a possible signal
A higher version number in code draws attention for good reason.
Some in the developer and analyst community see a new release in preparation.
Read with caution
Strings like this can be placeholders, test entries, or leftovers.
A single briefly visible artifact cannot be independently verified.
Bottom line
Treat "Claude Mythos 5.5" as unconfirmed until Anthropic says otherwise.
Whether the model is real depends on an official announcement.
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