I'm quoting the API list prices for Fable, at it's $10/million input and $50/million output (and $1/million for cache hits on input).
Anthropic have prices they charge for their models. These prices are what you pay if you use the API, and they are also what you pay if you are an "enterprise" customer - generally any company with 150+ employees.
I haven't seen Anthropic raise the prices of an existing model after it has launched. They sometimes raise prices when they ship a model - Fable is $10/$50 where Opus 4.8 is $5/$25.
They also have monthly subscriptions for individuals, which are a notoriously good deal. THOSE are definitely less trustworthy and predictable than the API list prices, since the subscription allowed quotas can and have changed in the past.
What am I missing here?