
OpenAI cut API prices for GPT-5.6 Luna by 80% and GPT-5.6 Terra by 20% on July 30, citing GPU kernel optimisations and speculative decoding improvements driven by Sol. Luna drops to $0.20/$1.20 per million tokens. Terra drops to $2.00/$12.00. Sol's standard price is unchanged, but a new Fast mode — 2.5× throughput at double the rate — replaces the old Priority Processing tier.




