DeepSeek V4.1 Flash built a slide deck for $0.73 to $1.08, V4 Pro alone stopped at slide 1 (no image input)

Ran one 10-slide pitch deck prompt twice each on V4.1 Flash and V4 Pro, through a CLI agent with slide-making skills from SenseNova-Skills. Flash alone finished both, 17.5 min for $1.08 and 29.9 min for $0.73. V4 Pro alone stopped at the first screenshot both times. The skills have the model screenshot and check every slide, and Pro can't read images on OpenRouter. So I set the helper model to Flash and had Pro hand the checks off. That finished both, slower and pricier: 32.2 min for $2.57 and 60.1 min for $4.25. In one of them the helper still ran on Pro, so that deck got no screenshot check. Two runs each, so it's not a benchmark. A full deck for $0.73 is kinda wild though.