Sonnet 5 review: I ran 64 generations to find out if it's worth it
- ID
- 2270
- Status
- summarized
- Published
- 01 Jul 2026, 7:22 AM
- Fetched
- 01 Jul 2026, 9:29 AM
- Provider
- Lenny's Newsletter
- Category
- product-startup
- Original URL
- https://www.lennysnewsletter.com/p/sonnet-5-review-i-ran-64-generations
- Source URL
- https://www.lennysnewsletter.com/feed
Summary
- Score
- 8.5
- Created
- 01 Jul 2026, 9:29 AM
- Tags
- Audience
- developersvibe_codersai_agent_userssaas_startup_founders
What happened
The creator built a live benchmarking tool called 'How I AI Bench' using Claude Code, then ran five frontier models through 64 blind prototype generations, PRDs, and agent voice tests to review Anthropic's Sonnet 5. The results challenged common assumptions about model performance.
Why it matters
Provides hands-on, practical comparison of leading AI models for real-world developer tasks—prototyping, spec writing, and voice agents—helping the community choose tools based on actual output quality rather than hype.
Discussion angle
What specific tasks (PRDs, voice agent handling) showed the biggest surprise in blind testing, and how can our audience run similar low-cost A/B checks before committing to a model for their stack?