Moving a Production AI Agent from Claude Opus 4.8 to GPT-5.6: What Actually Changed No Comments on Moving a Production AI Agent from Claude Opus 4.8 to GPT-5.6: What Actually Changed 4 Min Read Real production data: switching from Claude Opus 4.8 to GPT-5.6 Sol cut build time in half, cost 27% less, and output fewer tokens. But it came with surprises.