Is OpenAI: GPT-5.4 or SpaceXAI: Grok 4.20 cheaper?
SpaceXAI: Grok 4.20 is cheaper ($0.236 / 1M tokens input / $0.47 / 1M tokens output) vs OpenAI: GPT-5.4 ($0.47 / 1M tokens input / $2.82 / 1M tokens output). Actual cost depends on your input/output token mix — estimate it with the pricing calculator.