OpenAI's new model GPT-6.1 Terra exposed: reported to replace GPT-6.1 Sol in high-difficulty code review

OpenAI's new model GPT-6.1 Terra was exposed through changes in Microsoft and GitHub code repositories; leaks claim it is replacing GPT-6.1 Sol in high-difficulty code review and is cheaper. Microsoft's EF Core repository PR #39217 has already switched the judge_model of 18 evaluation configurations to gpt-6.1-terra, and GitHub Copilot is also reported to be testing the model in production. The Information says Terra's goal is to strengthen performance while lowering prices to counter Anthropic's competition.