// 9TO5MAC — MOBILE & WEB
Anthropic upgrades Claude with new Sonnet 5.5 model, details here
Anthropic is upgrading Claude Sonnet, replacing Sonnet 5 from June with Sonnet 5.5 as the best medium-sized model.
Anthropic currently offers a few AI models under the Claude umbrella.
The three main models are Haiku (smallest and cheapest), Sonnet (medium size and price), and Opus (largest and most expensive of the three).
There’s also Fable/Mythos, which is even more capable and costly, which represents Anthropic’s highest tier.
Today’s new Claude model follows the arrival of Opus 5.5 last week. Anthropic promised to upgrade Sonnet and Haiku “in the coming weeks” at the time.
Introducing Claude Sonnet 5.5, the second model in the Claude 5.5 family.It’s a clear upgrade over Sonnet 5, runs more than 30% faster, and costs up to 30% less for most work. pic.twitter.com/UvXD8mDTF1
Anthropic says Sonnet 5.5 is strongest at everyday tasks with a clear scope, including fixing bugs and creating polished documents, slides, and spreadsheets.
The company also highlights its design capabilities, from refining user interfaces to producing slides that follow templates and need minimal editing.
Early testers described it as a better collaborator than Sonnet 5, Anthropic says, with clearer writing and speed suited to quick iteration on less complex tasks.
Sonnet 5.5 is now live in Claude Code! 🎉 https://t.co/bU5dcnKQyl