Google now lets all engineers use Anthropic’s Opus 5 model. It is available only inside Antigravity, Google’s internal development tool. Access is granted under per-user quotas. Gemini remains Google’s primary model for internal work. Third-party models are positioned as supplementary. The move follows staff frustration with Gemini’s coding limits. Google had previously barred most employees from using outside tools like Claude. DeepMind teams and some high-priority projects already had access. Amazon made a similar change for its staff earlier this year.