For reference, Haiku 4.5 came out on October 15th, 2025 so these two columns are less than a year apart. and oh yeah Haiku 5.5 is also much faster and 75% cheaper…
@alexalbert__
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Working with Claude: Managing a team, not a tool
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This has completely changed how I work with Claude. It feels less like using a tool and more like managing a team. https://t.co/JaUllMPTJW
— Alex Albert (@alexalbert__) 23 juin 2026This has completely changed my way of working with Claude. It feels less like using a tool and more like managing a team.
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Working on fixes for prompt and future models as stopgap
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We're working on a few potential fixes for this in the prompt and in future models. This is more of a stopgap until those land
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Tip to make Fable write clearly in agentic conversations
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Fable seems superhuman in managing long agentic conversations, sometimes to the point where I can't follow what it tells me. This prompt snippet has been the best solution I've found to make it write clearly and abandon all jargon:
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Memories of launches of Claude Opus 3, Sonnet 3.5, and Opus 4.5
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I've been at Anthropic through every model launch. There's been a few cases I can remember of a launch that stands out and marks a step-change in how we use models:
— Alex Albert (@alexalbert__) 9 juin 2026
– Claude Opus 3
– Claude Sonnet 3.5
– Claude Opus 4.5
And now Claude Fable 5.
With Fable, the model stopped… https://t.co/PVivAMNL1XI was at Anthropic for every model launch. There have been a few cases that I remember where a launch stood out and marked a step change in how we use models:
– Claude Opus 3
– Claude Sonnet 3.5
– Claude Opus 4.5
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Anthropic: Claude writes more than 80% of merged code
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We have just published internal data on the share of Claude's development that is already done by Claude: – More than 80% of all merged code in our codebase is now written by Claude – It has been months that many researchers at Anthropic
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AI Model Opus 4.8 Calibration and User Feedback Request
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We put a lot of work into calibrating thinking effort for Opus 4.8. As you're trying out the model, if you do run into any examples of it still over/under thinking, please flag it to us!
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Claude Code User Shares Experience with Opus 4.8 Fast Mode
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Fast mode for Opus 4.8 is much more affordable now. Try it out in Claude Code, I've found it changes how I use Claude. Fast mode for interactive work where I want rapid responses, normal mode for longer async tasks where I don't need results right away.
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Release of Opus 4.8: Improved AI Model for Coding and Knowledge Work
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Excited to release Opus 4.8 today! We heard your feedback on 4.7 and have made many fixes for 4.8. 4.8 understands nuances better, feels much more natural to talk to, and is overall a stronger collaborator on everything from coding to knowledge work.
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Claude Mythos Preview snapshot outperforms next best model by 2x
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An early Claude Mythos Preview snapshot we provided METR has a time horizon of more than 2x the next best model on their 80% success rate benchmark