OpenAI cuts GPT-5.6 Luna's price 80% — three weeks after launch

On July 30, 2026, OpenAI dropped GPT-5.6 Luna to $0.20 per million input tokens and $1.20 per million output — an 80% cut that takes Luna's combined price from $7 to $1.40 per million — and cut Terra 20% to $2 in / $12 out. OpenAI attributes the cut to efficiency gains, including the model optimizing its own production code; it lands amid open-weight price pressure and cost-sensitive enterprise buyers.

What it means An 80% cut three weeks after launch says the frontier race is now a price race — re-run your model-cost math before renewing anything.