Lenny's Newsletter · Claire Vo
podcastplaybookGPT-5.6 Sol vs. Claude Fable: Why OpenAI’s new model crushes my benchmark
9 July 2026Product
Source excerpt
About Lenny's NewsletterWatch now | 🎙️GPT 5.6-Sol beats Fable on prototypes, PRDs, and browser use in my 5-category How I AI benchmark, and here's exactly where each model earns its spot.
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Apollo layer
What a founder can learn
Founder takeaway
Choose AI models by testing them on your team’s real workflows—not by relying on a single overall ranking. Compare outputs for tasks such as prototyping, PRD creation, and browser-based work, then assign each model where it performs best.
Why it matters
Model performance can vary by task. A workflow-specific benchmark helps founders make better tooling decisions, reduce rework, and avoid forcing one model into every use case.
Relevant guides
Put it to work
Pick three recurring, high-value workflows and run the same representative task through each model. Score output quality, speed, required revisions, and cost; then document which model your team should use for each workflow.