So it became gpt 5.4 xhigh but ten times the cost?

We're rich ;-)

More seriously, in a multi-agent setup the per-token cost matters less: a bit of Claude, a bit of Codex, a bit of Gemini-CLI, ... No single model carries the full bill, and having three different training sets catches more "green tests, wrong code" than any single xhigh pass would. Even at 10x per token, one well-placed Opus in the reviewer seat beats one full Opus session on everything.

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