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Anthropic accidentally leaked their next model Claude Sonnet 4.8 inside a public source code file nobody was supposed to see. Here's exactly what was found, what features are coming, when it drops, and how to prepare your workflows before it lands.
00:00 Intro – Anthropic Accidentally Leaked Their Next Model
00:37 How the Leak Happened – A Forgotten File in Claude Code's npm Update
00:52 What Was Inside – 512,000 Lines of Internal Code Gone Public
01:07 What the Leak Revealed – Unreleased Model Names & Hidden Features
01:19 Why There's No Sonnet 4.7 – How Anthropic's Version Numbers Actually Work
01:49 What's Coming in Sonnet 4.8 – Full Feature Breakdown
01:56 Upgrade #1 – Vision Goes From 54% to 98% Accuracy
02:28 Upgrade #2 – Major Coding Benchmark Jump Inherited From Opus 4.7
02:47 Upgrade #3 – Stricter Instruction Following & New Effort Level
03:12 Hidden Feature "Chyros" – A Persistent Background AI Agent Explained
03:41 When Will Sonnet 4.8 Drop? – Release Timeline & What to Watch For
04:49 How to Prepare – Save Your Best Prompts Before It Lands
05:06 Build a Test Set – Benchmark 4.6 Now So You Have Real Data
05:23 Plan for Token Usage Changes – What the New Tokenizer Means for Costs
05:43 Team & Automation Prep – Stop Hardcoding Model Names
05:56 What Else Was in the Leak – Capiara, Mythos & 44 Hidden Feature Flags
06:32 Mythos Is Already Real – Confirmed April 7th Release Context
06:55 Undercover Mode – How We Know Sonnet 4.8 Is Definitely Coming
07:18 Full Summary – Everything You Need to Know in 60 Seconds
07:35 Action Plan – What to Do Today Before the Model Drops
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