My session with Claude Code and PRDs
Two rival frontier models, both at maximum reasoning, in one loop that ships unattended for days. It runs $500–$1,000 a day — and measured against what it delivers, that's cheap.
The Sol/Terra/Luna preview is now real. GPT-5.6 shipped July 9 — and the story isn't the benchmarks. It's that Sol is bundled into ChatGPT Pro at half of Claude Fable 5's token price, plus one coding benchmark OpenAI quietly skipped.
Anthropic found a small, privileged workspace inside Claude — internal patterns, readable with a new Jacobian 'J-lens', holding concepts the model reasons with but never writes down. Not a consciousness claim. Maybe something more useful: a window into the thoughts a model doesn't print.
OpenAI isn't shipping GPT-5.6 as one model. It's shipping a ladder — Sol, Terra, Luna — that turns the frontier into a pricing decision. Public launch Thursday. Here's how to read the three tiers and where each one actually earns its cost.