OpenAI API is free; Grok starts at $16/mo. OpenAI API is rated higher at 4.7/5 vs Grok's 4.3/5.


OpenAI API uniquely offers GPT-4o access, DALL-E 3, Whisper speech-to-text. Grok uniquely offers Real-time X/Twitter data, Image generation, Code assistance. Both share 0 features.
Independent analysis based on features, pricing, and user ratings
OpenAI API is free; Grok starts at $16/mo.