OpenAI Introduces $100/Month Pro Tier and GPT-5.3 Instant Mini with Enhanced Conversational Capabilities

OpenAI launched a new $100/month ChatGPT Pro subscription tier positioned between the $20 Plus and $200 Pro plans, offering 5x more Codex usage for developers and power users with heavy coding needs. Simultaneously, GPT-5.3 Instant Mini was released as the new fallback model across ChatGPT, delivering more natural conversation, reduced unnecessary disclaimers, stronger writing, and improved contextual awareness. The update also introduces workspace-level SCIM group controls for managing project and GPT discoverability in enterprise settings. Separately, OpenAI disclosed a security incident involving a third-party tool but confirmed user passwords and API keys were not affected.