There are a few different GPT-4 models to choose from, including a new generation of GPT-4 models.
There are a few main things to consider (not an exhaustive list) when choosing which GPT-4 model to use:
Context window (some models have as low as an 8k context window while some have an 128k context window)
Knowledge cutoff (some models have been training on more up to date information which makes them better at certain tasks)
Cost (the cost for models vary, our latest GPT-4 Turbo model is less expensive than previous GPT-4 model variants, you can learn more on our pricing page)
Feature set (some models offer new features like JSON mode, reproducible outputs, parallel function calling, etc)
Rate limits (different models have different rate limits, check out the limits page for more details on each models limits)
You can check out our models page for more details on each GPT-4 model and their features.