We Tested Anthropic’s Fable 5 for a Week
Dan Shipper, CEO of Every, spent a week testing Anthropic’s Fable 5, a Mythos-class model that scored a 91 out of 100 on Every’s senior-engineer benchmark, compared with a 63 for Opus 4.8 and a 62 for GPT-5.5. It excels at research, complex judgment, and large projects, but it is slow, expensive and best suited for high-level agentic builders.
Dan breaks down how to get the most out of the best coding model on the market, and what this means for the future of work after automation.
Read the full Vibe Check:
https://every.to/vibe-check/anthropic...
Claude Fable 5 Prompt Library:
https://every.to/p/claude-fable-5-pro...
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⌚ Timestamps:
00:00 One prompt built an infinite 3D library
01:22 Our day-zero Fable 5 review
02:25 What a Mythos-class model is
03:28 The 91/100 engineering benchmark
04:12 Why it feels like a warp drive
06:10 Where the model falls short
07:04 Building a Heidegger lecture site
09:05 Finding a growth bet in customer data
10:35 Clearing a real GitHub backlog
11:17 Who should actually use this model
13:31 Where other models still win
14:26 What this means after automation
16:02 The final verdict
🔗 Links:
After Automation:
https://every.to/p/after-automation?u...
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The 8 Levels of AI Adoption:
https://every.to/guides/the-eight-lev...