
OpenAI Astra Model Solves 10 Open Math Problems With Lean Proofs
The OpenAI Astra model produced ten new maths results with machine-checkable Lean 4 proofs for about $2,000 in inference. What that actually means.
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The OpenAI Astra model produced ten new maths results with machine-checkable Lean 4 proofs for about $2,000 in inference. What that actually means.

OpenAI slashed GPT-5.6 Luna's API price 80% to $0.20/$1.20 per million tokens. Here's exactly what changed, why, and how to use it to cut your AI bill.