Direct answer: the reviewed sources don’t establish a fixed daily count
How many images can you generate with ChatGPT per day? The official sources reviewed here do not establish a fixed daily image count, either for all users or by plan. OpenAI says ChatGPT Images is available on all tiers, but its Images in ChatGPT help page gives no daily quota. Its Free Tier FAQ says image generation has a separate usage limit; it does not give a specific image count. (Images in ChatGPT; ChatGPT Free Tier FAQ)
So a number such as “120 images per day” should not be treated as an official allowance based on these sources. The answer for your account may depend on the applicable product limits, but these pages don’t provide a dependable daily figure for planning a workload.
What happens when you reach a limit?
OpenAI says Free-tier image generation has a separate usage limit and that ChatGPT notifies you when you reach an applicable tool limit. For a tool limit, the FAQ says you’ll need to wait until a later time to use that tool again. The reviewed guidance does not specify an image-generation reset interval or a universal reset time. (ChatGPT Free Tier FAQ)
The same FAQ says Plus users have higher rate limits, but it does not establish a specific higher image allowance or daily image count for Plus. Don’t convert that general statement into a quota: check the limit message shown in ChatGPT for the applicable information on your account.
ChatGPT limits vs. production API limits
ChatGPT’s interactive usage limits and the API’s rate limits are separate. For programmatic image generation, OpenAI currently documents GPT Image 2.6 Flare and GPT Image 2.6 Sunburst. The Image API supports image generation; the Responses API supports image generation as part of a conversation or multi-step flow. (OpenAI API image-generation guide; OpenAI’s Images 2.6 announcement)
For a single prompt-to-image request, the Image API is the documented option to consider; for a conversational or multi-step image workflow, consider the Responses API. OpenAI says API rate limits vary by model and usage tier. Check the applicable model limits and your organization’s Limits page before estimating production capacity; those limits are not a guaranteed number of images per day. (API rate limits; OpenAI API image-generation guide)
Sources
Images in ChatGPT — OpenAI Help Center
ChatGPT Free Tier FAQ — OpenAI Help Center