DeepSeek V4 Flash 0731 is presented as an API update that keeps the preview model's 284 billion total parameters, 13 billion active parameters and one-million-token context window. The reported gains come from agentic post-training rather than a larger architecture, and the release adds Responses API support intended for Codex-style workflows.
Official benchmark claims show large gains across terminal, software-engineering and tool-use tests. The review cautions that DeepSeek used an upcoming harness with specific settings, so results in other tools may differ and the marketing figures should not be treated as environment-independent performance.
The reviewer then runs eight custom tasks spanning interface logic, 3D scenes, SVG generation, a game, mathematics and a long-horizon local fine-tuning workflow. DeepSeek V4 Flash earns full marks on the math problem and the autonomous data-generation, fine-tuning and web-interface task, while simpler visual and animation tests produce more uneven results.
The model finishes with 58 out of 80, or 72.5 percent, on the custom benchmark. The pattern supports a qualified verdict: reasoning and extended agentic coding are the clearest strengths, visual polish remains average, and the model appears to offer strong value for budget-conscious developers without leading the overall field.
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