OpenAI Codex pricing change detected: model flat → hybrid

Detected automatically from the vendor pricing page. Pricing options include a Free plan at $0/month, Go at $8/month, Plus at $20/month, Pro plans starting from $100/month, Business at $20 per user per month (billed annually, $25 monthly), Enterprise & Edu requiring sales contact, and an API Key option with usage-based pricing. Pending human verification (needs_review).