AI Dev Weekly is a Thursday series where I cover the week's most important AI developer news, with my take as someone who actually uses these tools daily.
This was the most packed week in AI since I started writing this newsletter. Four separate stories that would each dominate a normal week all landed within 72 hours: Anthropic shipped their most powerful model ever (with hidden restrictions that sparked fury), Google invented a new way to generate text 4× faster, Apple rebuilt Siri from scratch on Gemini, and a German court made a ruling that affects every developer deploying AI. Let's go.
1. Claude Fable 5: the best model with the worst controversy
Anthropic released Claude Fable 5 on June 9 — their first Mythos-class model available to the general public. The benchmarks are genuinely staggering: 95% on SWE-bench Verified, 80% on SWE-bench Pro, and 91/100 on Every's Senior Engineer benchmark (vs 63 for Opus 4.8 and 62 for GPT-5.5).
The specs: 1M context, 128K max output, $10/$50 per million tokens (exactly 2× Opus 4.8). Free on Pro/Max/Team/Enterprise through June 22.
