DeepSeek R1-0528 tied for first place with Claude Opus 4 in the WebDev arena.

LMArena has released the latest rankings of large-scale web development arena, with DeepSeek R1-0528 performing at the top level, jointly ranking first with Google Gemini 2.5 0605 and Claude opus 4. Other highlights include: ranking 6th in comprehensive text ability, 2nd in programming field, 4th in high difficulty prompts, and 5th in mathematics. It has MIT open source license and is currently the strongest open source model on the list.