OpenAI (Jul 30, 2026): GPT-5.6 Luna 80% cheaper; Terra 20% cheaper. API: Luna 1.20 per M tokens; Terra 12; Sol unchanged. Fast mode for Sol: up to 2.5× faster at 2× price, replaces Priority Processing. Prices also reflected in Codex/ChatGPT Work credit consumption. Subscription prices unchanged. AWS rollout same day.