anthropic.com › research › diff-tool A “diff” tool for AI: Finding behavioral differences in new models …GPT-OSS-20B vs DeepSeek-R1-0528-Qwen3-8B We also compared a more powerful open-source model, OpenAI's GPT-OSS-20B , to DeepSeek's model DeepSeek-R1-0528-Qwen3-8B… Mar 13, 2026