Anthropic released Claude Fable 5.2 and Claude Mythos 5.2 on Monday, six days before an IPO it hopes will be the largest on record. Both are built on the same underlying model and both now cost $8 per million input tokens and $40 per million output, down from $10 and $50 on the 5.1 versions. That is exactly the 20% cut the company claimed, and the Batch API halves it again to $4 and $20.
The split between them is about who is allowed to ask what. Fable 5.2 ships with safeguards that block most cybersecurity and biology tasks and is available to every user. Mythos 5.2 carries fewer restrictions and is limited to vetted organisations working in cybersecurity or biomedical research. Same weights, same price, different gate. Anthropic says both run up to 30% faster than the versions they replace, with the gain concentrated on long coding tasks.
The timing is the story behind the story. Anthropic is targeting the week of 16 November for its listing, aiming to raise up to $100 billion at a valuation above $1 trillion. That figure has been falling: estimates ran as high as $2 trillion earlier in the autumn. Shipping a cheaper, faster frontier model the week before you price is not an accident.
For anyone already on Fable 5.1, the upgrade is close to free money — 20% off for a model the vendor says is faster. The one thing to check before switching is whether your workload touches anything Fable 5.2 now refuses: the safeguards are on the consumer model, not the expensive one.