Fable will be included for up to 50% of weekly usage limits through July 7, after that it will be available via usage credits.

Sonnet 5 costs more than Opus 4.8 on the Artificial Analysis Intelligence Index

Anthropic has received notice that the Department of Commerce has lifted export controls on Claude Fable 5 and Mythos 5. They'll begin restoring access tomorrow.

Sonnet 5 is a substantial improvement over Sonnet 4.6 on reasoning, tool use, coding, and knowledge work. Its performance is close to Opus 4.8

In order to free Fable, user identity verification may be one of the things that the US Government is asking for. New Claude app strings tie Fable 5 usage credits to identity verification. The strings show Fable 5 is being put behind the usage credit system, billed outside your plan. Identity verification is referenced in the same update: "Your credits will be added once your identity is verified." Anthropic previously called identity verification unrelated to Fable and limited to flagged accounts. These strings showed up alongside the Fable 5 credit changes.