How do I choose Plus or Pro for GPT-6.1 Sol? Can I use it in regular Chat?
GPT-6.1 Sol is built for complex coding and multi-step work in ChatGPT Work and Codex, not regular Chat. Compare Plus for daily development and Pro when sustained coding or research repeatedly hits usage limits. At launch on September 29, 2026, eligible plans included Plus, Pro, Business, Enterprise and Edu; Go and Free were not included, and enterprise access may require an administrator. Model access and quotas depend on the target account. GPT-6.1 Sol and GPT-6 Sol are separate models; subscriptions do not include API usage.