DeepSeek V4 Flash 0731 listed on OpenRouter

The model costs $0.048 per million input tokens and $0.144 per million output tokens. It has a context window of 1,048,576 tokens and 304.2 billion parameters. It is open weights and was released on 2026-07-31.

deepseek-ai announced deepseek-ai/DeepSeek-V4-Flash-0731 as the official release of DeepSeek-V4-Flash, superseding the preview version. According to deepseek-ai, DeepSeek-V4-Flash-0731 has the same model structure as DeepSeek-V4-Flash-DSpark with a speculative decoding module attached. According to deepseek-ai, DeepSeek-V4-Flash-0731 outperforms DeepSeek-V4-Pro (Preview) on benchmarks despite its far smaller activated parameter count. According to deepseek-ai, DeepSeek-V4-Flash-0731 scores 82.7 on Terminal Bench 2.1, 54.2 on NL2Repo, 76.7 on Cybergym, 54.4 on DeepSWE, 70.3 on Toolathlon-Verified, 25.2 on Agents' Last Exam, 25.1 on AutomationBench Public, 68.7 on DSBench-FullStack, and 59.6 on DSBench-Hard.