Much better value by using K2.7 Code with GitHub cli via opencode subscription - at $10/month gives you $60 worth of usage (for now) - you get $5 usage credits per day (with some weekly / monthly limits)
gpt-5.5xhigh leading benchmark, coincides with my recent experience. I've been opus 4.7 user but it burns tokens so quickly, so gave gpt-5.5xhigh (via codex) a try, quality was similar (if not better), and tokens lasted a lot longer.