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@mikeyk
Building at Anthropic Labs @anthropicai. Before: CPO at Anthropic, co-founder & CTO of @instagram and @artifact_news
AI
Anthropic says it costs around 75% less to run on average than Haiku 4.5 and improves coding and computer use.
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Anthropic says Sonnet 5.5 runs more than 30% faster than Sonnet 5. In pre-release max-effort tests, Artificial Analysis measured per-task costs roughly 50% higher than Sonnet 5’s.
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A user relays Anthropic's claim that Opus 5.5 performs around the level of its previous Fable 5.1 flagship while costing 40% less to run than Opus 5.
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TestingCatalog cited rumors of a launch the week of September 21. A separate account said Polymarket odds for Anthropic’s next Opus release on September 21 had jumped to 88%.
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The creator says they struggled to picture the whole level, so they made an interactive artifact—and think they finally understand it.
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A user describes agents that manage memory and spin off subagents for tasks, with options to request proactive work or scheduled actions.
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The Claude team says the update brings Docs, Slides and Design into every conversation, with outputs users can edit and download.
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Updated model targets coding, reasoning, and long-running agentic tasks.
