DeepSeek V4

DeepSeek V4 is the best-performing zero-cost AI model of May 2026, freely accessible via API with no usage fees while matching GPT-5 class benchmarks — outperforming most paid alternatives in value. Mixture-of-experts architecture improvements reduce inference compute costs by 40% versus V3, allowing the Hangzhou-based lab to sustain its free tier economically. This efficiency edge means DeepSeek V4 outperforms #10 ChatGPT Workspace Agents on raw computational cost for developers, delivering 256K token context window support at zero price.