Anthropic upgrades Claude with new Opus 5.5 model, details here

Anthropic has released its latest AI model with Claude Opus 5.5. The new version arrives about two months after the previous Opus model upgrade, matching Anthropic’s previous upgrade cadence. 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 release upgrades Claude’s Opus model from version 5 to version 5.5. “Opus 5.5 is our first model since we called for pacing the frontier,” Anthropic says.

First reported by 9to5Mac. This page is a short excerpt; the full text is theirs.