Three reasons why DeepSeek’s new model V4 matters

MIT Technology Review / 4/25/2026

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Key Points

  • DeepSeek released a preview of its long-awaited flagship model, V4, positioning it as the company’s latest major step forward.
  • V4 can handle much longer prompts than the prior generation by using a new design that improves efficiency when processing large amounts of text.
  • The company continues to offer V4 as open source, making the model more accessible for developers and researchers.
  • The article frames these changes as meaningful because they improve both usability (long-context handling) and adoption potential (open availability).
On Friday, Chinese AI firm DeepSeek released a preview of V4, its long-awaited new flagship model. Notably, the model can process much longer prompts than its last generation, thanks to a new design that helps it handle large amounts of text more efficiently. Like DeepSeek’s previous models, V4 is open source, meaning it is available…