- Part 1
Claude Opus 5 is here: what changes for you today
Anthropic shipped Claude Opus 5 today. Same price as 4.8, close to Fable 5. What that means in practice, whether you just chat, build with it, or pay for it.
Read story → - Part 2
Effort is the dial that matters in Opus 5
Five settings, from low to max. The price per token has not changed, so this is where your bill gets decided. And the surprise sits at the bottom end.
Read story → - Part 3
The Opus 5 benchmarks, and the four it loses
Anthropic publishes fourteen measurements across twelve benchmarks. Opus 5 wins most of them, but the four it loses say more, and one number puts the whole table in perspective.
Read story → - Part 4
Four things that break when you move to Opus 5
For anyone building on the API. One change throws a hard error, the others quietly change your bill. Plus the instructions you should be deleting.
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