DeepSeek V4 Pro as a Labs experiment, open for a short test window (July 14 to 18, 2026): temporary, not a permanent model. DeepSeek's flagship coding and reasoning MoE, served from the original weights with speculative decoding for speed. Reasoning has three modes: non-think (none), think high (high, the default) and think max (max). Access is seat-gated through the Labs page while an experiment is live. It is offered at limited capacity and availability, so expect it to be flaky and to go down under load: crash it, give it a moment, and try again. For production work we recommend umans-coder or umans-glm-5.2.