deepseek-chat upgraded to DeepSeek-V2-0628, with better reasoning and role-play

deepseek-chat

The deepseek-chat model has been upgraded to DeepSeek-V2-0628. Reasoning improved, and role-play got a clear boost. HumanEval Pass@1 rose from 79.88% to 84.76%, MATH ACC@1 from 55.02% to 71.02%, and BBH from 78.56% to 83.40%.

Why it matters: The math benchmark gain is larger than the code and reasoning gains, and the win rate against GPT-4-0314 on Arena-Hard also improved.