We explore the abstract reasoning abilities of text-only and multimodal versions of GPT-4, using the ConceptARC benchmark, which is designed to evaluate robust understanding and reasoning with core-knowledge concepts. We extend the work of Moskvichev et al.by evaluating GPT-4 on more detailed, one-shot prompting (rather than simple, zero-shot prompts)  with text versions of ConceptARC tasks, and by evaluating GPT-4V, the multimodal version of GPT-4, on zero- and one-shot prompts using image versions of the simplest tasks. Our experimental results support the conclusion that neither version of GPT-4 has developed robust abstraction abilities at humanlike levels.