You could use Hugging Face's Inference API (which supports all of these API providers) directly making it easier to switch between them, e.g. look at the panel on the right on: https://huggingface.co/openai/whisper-large-v3
(b) growth is still the right metric imo. for example, lots of open-source libraries (which by definition are available to use for free) measure and optimize for growth
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