I found this on X and it seems like a good workflow to use the two tools together:
o1 PRO - https://chatgpt.com/share/67a817e1-7d4c-8001-bea7-b45d34c8e7... DeepResearch - https://chatgpt.com/share/67a817ec-e360-8001-af8f-1748080ea1...
Stratechery just published detailed specific examples of when it's useful and not: https://stratechery.com/2025/deep-research-and-knowledge-val...
They are very good at searching for niche results that are not often found by simply looking them up on Google. It is often depressing to find a better alternative after building software, but if you ask deep research first, they will find all the competition.
example: https://chatgpt.com/share/67ab4d04-4470-8011-a67d-fd7effc923...