DeepSeek V4 Released: Open-Source Model Challenges GPT-5 Again, Single API Cost Less Than 1/10 of Competitors

DeepSeek has released its V4 series models, achieving parity with GPT-5 and Claude Opus 4.5 on key benchmarks such as MMLU-Pro and LiveCodeBench, while API call prices are less than 10% of competitors. The open-source community has responded enthusiastically, with GitHub stars exceeding 50K on the first day. Developers worldwide are rapidly migrating applications from OpenAI to DeepSeek, triggering a new round of price wars in the AI model market.