DeepSeek launched and open-sourced V4 Preview: V4-Pro (1.6T total / 49B active) rivaling closed-source frontier models, and V4-Flash (284B / 13B active) for cost efficiency. The model achieves open-source SOTA on agentic coding with default 1M context and day-one integration across Claude Code and OpenCode.

Key Takeaways

  • ✓V4-Pro features a 1.6T/49B MoE architecture with open-source SOTA on agentic software development.
  • ✓1M context window is now the standard default across official DeepSeek web and API endpoints.
  • ✓API is fully OpenAI/Anthropic compatible, providing drop-in integration for coding agents.
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Up NextDeepSeek ships V4.1-Flash-1017: MIT open weights, live on web, app and API at unchanged prices, DeepSWE 77.0 (vendor-reported), plus public Search/Fetch APIs
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