Roboflow says GPT-5.6 Sol is OpenAI’s strongest vision model so far
Roboflow, a third-party computer vision evaluation firm, said GPT-5.6 Sol posted the strongest visual performance yet from OpenAI in its VLM benchmark. The biggest jump came in object detection, where Sol scored 46.2 versus 13.8 for GPT-5.5, while Terra and Luna followed at 44.7 and 43.3. Counting accuracy also improved, with Sol rising from 64.9% to 73%. Roboflow highlighted document layout parsing as another area of progress, saying Sol could cleanly identify titles, body text, tables, illustrations, and signatures in documents. The gains were not universal. In full OCR transcription, Sol scored 90.7%, slightly below GPT-5.5’s 91.2%. In targeted extraction tasks such as pulling a date from an invoice, Sol fell to 82.5% from 87.6% for GPT-5.5. Roboflow also reported that detection boxes could become unstable on images around 2000×2000 pixels or larger, a limitation OpenAI acknowledged. According to Roboflow’s testing, Sol cost about 2.5 cents per image and took around 10 seconds, compared with about 1 cent and 6 seconds for Terra, and under 0.5 cents and 5 seconds for Luna. The firm said Gemini 3.5 Flash remained ahead on detection and counting in this benchmark while also costing less per image.








