OpenAI expands GPT-6 Pro in ChatGPT with thinking levels and agent workflows

OpenAI has rolled out GPT-6 Pro (the Astra model) in ChatGPT for Pro, Business and Enterprise plans. It adds Instant, Medium, High and Extra High thinking levels, faster responses, better prompt caching and Intelligent UI. Parallel subagents remain a beta Responses API capability for GPT-6.1 Sol and GPT-5.6.

• GPT-6 Pro is available on Pro $100, Pro $200, Business and Enterprise plans
• Thinking levels include Instant, Medium, High and Extra High
• Parallel subagents are a beta Responses API feature for GPT-6.1 Sol and GPT-5.6
• Prompt caching and interleaved thinking target long agent workflows