Claude Fable 5's New Tokenizer Inflates Token Counts 30%: What Every Operator Must Audit Before Migrating
Claude Fable 5 ships a new tokenizer that produces ~30% more tokens from the same text versus pre-Opus-4.7 models. Here is what AI engineering teams must audit before migrating: token budgets, cost models, cache boundaries, and max_tokens headroom.
via Anthropic