Alex Albert works on developer relations at Anthropic and posts about Claude models on X. His recent posts focus on the Claude 5.5 family: he praised Opus 5.5 as smart, clear-writing, fast and cheaper, noted that Sonnet 5.5 and Haiku 5.5 were coming in the following weeks, and after release called Sonnet 5.5 a major capabilities jump over Sonnet 5 that is fast and good for iterating.
Sonnet 5.5 has the same feel I liked about Opus 5.5. It writes clearly, it's very fast, and it's a major capabilities jump over Sonnet 5. Really great model to iterate with. [Quoting @claudeai]: Introducing Claude Sonnet 5.5, the second model in the Claude 5.…
Lots more coming soon. Today is just the start! [Quoting @mikeyk]: We’re also launching Claude Sonnet 5.5 and Haiku 5.5 in the coming weeks. These models will come with many of the same improvements to performance, efficiency, and safety. With that, happy bui…
Using Opus 5.5 feels like hitting every green light on your drive home, drinking a cold glass of water when you're thirsty, and a hot shower after a long day. It's super smart, it writes clearly, it's fast, and it costs way less. It's a very good model. [Quot…
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