In August, Elon Musk’s xAI promised to make Grok, the company’s flagship generative AI model powering a number of features on X, available via an API. Now, that API has arrived — albeit a bit bare-bones at the moment. The xAI API only has a single model, “grok-beta,” priced at $5 per million input tokens (~750,000 words) or $15 per million output tokens. Tokens are subdivided bits of raw data, like the syllables “fan,” “tas,” and “tic” in the word “fantastic.” It’s unclear which Grok model “grok...