Building with Claude Sonnet 5.5: choosing, migrating, and tuning
Source
ClaudeDevs
Author
ClaudeDevs
Date
Terms in this piece · Glossary
token — The chunk of text a model reads and writes in — roughly three-quarters of a word — and the unit AI usage is billed in.
Why it matters
Explains when to pick Sonnet 5.5 over Opus 5.5, how it is priced at $2/$10 per million tokenThe chunk of text a model reads and writes in — roughly three-quarters of a word — and the unit AI usage is billed in.Full definition →, and that thinking is on by default, so code reading content[0].text can break. Helps with migration.
