What is effort really? When do you change it it and why not just use max effort for everything?
I dove deep into this problem, looking into evals and doing my own tests and I was quite surprised by the results.
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a skill people at Anthropic have been using a lot recently: ELI5
/eli5 <what you want explained>
"explain like I'm someone who knows nothing about this topic, using a HTML artifact with big pictures and few words"
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Watermarking without quality loss is a bit unintuitive, doesn't feel like it should work.
I made this artifact with Claude to help me understand how it works, sharing in case it's helpful.
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We’ve written an FAQ to answer some of the questions we've received about watermarking.
In summary:
• We’re implementing watermarking to comply with the EU AI Act. Other major model developers have signed the same Code of Practice and will also be implementing watermarking;
• Our watermarking method doesn’t have any practical impact on the quality or content of Claude’s outputs;
• The difference between watermarked and un-watermarked text will not be distinguishable to readers;
• Nothing is added to the text and there are no hidden characters;
• Watermarking doesn’t require extra tokens, and will not be more expensive;
• Watermarks can’t be traced to a specific person, organization, or chat.
Read more:
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We removed ~80% of the Claude Code system prompt for our newest models, this is what we've learned about writing system prompts, skills and Claude.MDs for them.
I'm sad it took me this long to actually type /design but working on frontend with Claude Design and Claude Code is actually so good
This was due to a heroic effort by many people at Anthropic working sometimes literally around the clock
It was not at all clear that we'd be able to do this in time, and so proud of everyone who made it happen.
Enjoy Fable.
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I've heard a lot of questions about Fable's availability on subscription plans.
While it will come off subscriptions after July 7th, we aim to restore Fable as a standard part of our subscriptions as soon as capacity allows, as we mentioned in our original blog post.
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Hi, this is an experiment we launched in March that was meant to prevent account abuse from unauthorized resellers and protect against distillation.
The team has landed stronger mitigations since then and we’ve actually been meaning to take this down for a while. We merged the PR and this should be fully rolled back in tomorrow’s release.
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Lots of people asked how I used Fable to edit its own launch video so I made a video about that!
TLDR it wrote a lot of code & tool calls to use transcription services, ffmpeg, do colorgrading, use the figma mcp, make remotion UI and render it.
I didn't touch a video editor.
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a prompt I've been using a lot recently:
implement <SPEC> and while you do, keep a running implementation-notes.html file (or markdown) with decisions you had to make weren't in the spec, things you had to change, tradeoffs you had to make or anything else I should know
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New in Claude Code: /ultraplan
Claude builds an implementation plan for you on the web. You can read it and edit it, then run the plan on the web or back in your terminal.
Available now in preview for all users with CC on the web enabled.
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We just released Claude Code channels, which allows you to control your Claude Code session through select MCPs, starting with Telegram and Discord.
Use this to message Claude Code directly from your phone.
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We just added /btw to Claude Code!
Use it to have side chain conversations while Claude is working.
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Voice mode is rolling out now in Claude Code. It’s live for ~5% of users today, and will be ramping through the coming weeks.
You'll see a note on the welcome screen once you have access. /voice to toggle it on!
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Why even non-coding agents need bash
I've done dozens of calls with companies making general agents over the past few weeks and my advice generally boils down to: "use the bash tool more"
Here's a concrete example from my email agent:
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