OpenAI has launched its first model, o1-pro, exclusively through the new Responses API, requiring users to upgrade from the Chat Completions API. Although the model has a strong capability for identifying nuanced bugs in code, comments highlight concerns over its high pricing—$150 per million input tokens and $600 per million output tokens—which may limit access for average users and only attract enterprise-level clients. Users express mixed feelings, citing the model's capability versus its cost, and some anticipate further developments like the upcoming o3 pro model. The knowledge cut-off for o1-pro is set to 2023, but the 200k context window is viewed as somewhat disappointing in light of the rapid advances in the AI field.