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Introducing Claude Opus 5.5, the first model in our new Claude 5.5 family. It performs at the level of Claude Fable 5.1 for most tasks, and costs 40% less to run than Opus 5. https://t.co/Q9C2VKQ79f

Introducing Claude Opus 5.5, the first model in our new Claude 5.5 family. It performs at the level of Claude Fable 5.1 for most tasks, and costs 40% less to run than Opus 5. https://t.co/Q9C2VKQ79f

Introducing Claude Opus 5.5, the first model in our new Claude 5.5 family. It performs at the level of Claude Fable 5.1 for most tasks, and costs 40% less to run than Opus 5.

And here are the benchmarks! Opus 5.5 excels Fable 5.1 in literally every single eval and even GPT-6 Astra in almost every single one. Holy moly, this is going to be interesting! h/t @synthwavedd

Opus 5.5 already in Claude Code! Release imminent! https://t.co/tXYHbp9AEQ

.@Grok in your Tesla can now do meaningful work for you With Connectors, you can manage your inbox, clean up your calendar, or talk through existing files/chat/tasks – all hands-free

New podcast with @datagenproc of @EpochAIResearch digging into the open questions determining the future of frontier AI! We cover: 00:00 Predictions for RSI 18:15 The role of robotics in an AI acceleration 24:20 How far behind are Chinese models? 27:39 Does distillation explain the gap? 40:58 What Chinese job postings reveal about their labs 48:13 Are open or closed models safer? 58:10 How Epoch AI ticks 1:00:55 What a frontier post-training recipe looks like He's one of the people who gives the best feedback on my writing, so I was stoked to have him on.