[selcuka]

With Anthropic you always have 3 models to choose from: Opus-latest, Sonnet-latest, and Haiku-latest, from the best/slowest to the worst/fastest.

The version numbers are mostly irrelevant as afaik price per token doesn't change between versions.

[maxo99]

Three random names isn't ideal. I'm often need to double check which is which. This is why we use numbers

[dseravalli]

They aren't random. Opus's are very long poems, haikus are very short ones (3 lines), sonnets are in between (~14 lines)

[oliwary]

What's next? Claude Iliad?

[echoangle]

How are the names random?

https://en.wikipedia.org/wiki/Masterpiece

https://en.wikipedia.org/wiki/Sonnet

https://en.wikipedia.org/wiki/Haiku

They dropped the magnum from opus but you could still easily deduce the order of the models just from their names if you know the words.