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More than 90% of the changes that go into Anthropic's main codebase are now written by Claude under human direction, the company said.

So when does Anthropic recommend Fable 5.2 and Mythos 5.2?

For most coding and knowledge-work tasks, it advises starting with Opus 5.5. Fable and Mythos are best for the most ambitious open-ended technical tasks.

Fable 5.2 can also act as an "Advisor": other models turn to it for advice on harder problems.

It can also be an "Orchestrator" that hands simpler tasks off to smaller models.

Anthropic has updated its most powerful models and released Claude Fable 5.2 and Mythos 5.2.

Fable is available to everyone and has safeguards against misuse in cybersecurity and biology.

Mythos goes only to vetted organizations through special verification programs.

The new models generate answers up to 30% faster than 5.1 and cost less: $8 per million input tokens and $40 per million output tokens. An optional fast mode speeds generation up by as much as 2.5x.

Anthropic has started adding invisible watermarks (based on Google SynthID) to Claude's texts: since November 3 in Mythos 5, Opus 4.7 and Sonnet 4.6, and from November 16 in older models, because Article 50 of the EU AI Act requires it.

The mark can't be turned off and carries no user data, and for now only regulators, media and researchers can detect it.

💸 Anthropic launched a beta version of Personal Finance in Claude.

The user can securely connect bank accounts and cards via Plaid and ask questions in their own words: where the money went this month, which payments are still due before payday, whether there are any double charges or hidden fees.

Claude can also build a spending chart, a payment calendar, or a dashboard.

Read-only access: Claude cannot transfer or invest money, does not see the bank password, and chats in this section are not used for training models.

The app has no ads or sponsored recommendations. The beta starts this week for Pro, Max and Ultra plans, for now only in the US.

The release of Anthropic's Mythos 5.5 model is getting close. The company has already started preparing its website for it.

Grok was asked to remove the worst AI model of the four, and it removed… itself.

Anthropic acquired Mithril, a one-person startup, and launched a pharmaceutical division.

The startup was developing drugs for two rare forms of muscular dystrophy. Its founder, using Claude, coordinated 11 external laboratories and, in less than 18 months, brought one candidate to promising results in mice.

He is now continuing the work at Anthropic.

Anthropic's net loss for the first half of 2026 rose from $13 billion to $80.7 billion. Of this, $72 billion is an accounting entry due to the rise in the value of convertible bonds.

The IPO is expected in November.

Nvidia released an open 120-billion-parameter model that, after fine-tuning, outperformed Claude Opus 5 on one task.

According to Artificial Analysis, it is 5 times faster than its closest competitor in its class.

Without fine-tuning, the base model did not beat the closed flagships. For general everyday tasks, closed models like Opus 5.5 are more convenient because they work without any setup.

Open models have their own advantages: they can be fine-tuned on your own data and run on your own servers, and they are fast for large volumes of repetitive work.