Is Claude Haiku 4.5 or GPT-5.1 Codex Mini cheaper?
GPT-5.1 Codex Mini is cheaper ($0.25 / 1M tokens input / $2 / 1M tokens output) vs Claude Haiku 4.5 ($1 / 1M tokens input / $5 / 1M tokens output). Actual cost depends on your input/output token mix — estimate it with the pricing calculator.