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DeepSeek has made its V4-Pro API price cut of 75% permanent, with per-million cached input tokens at just $0.003625 and output tokens at $0.87, about 34 times cheaper than OpenAI's GPT-5.5. The model has 1.6 trillion parameters but requires only 49 billion active parameters, supports a 1-million-token context, and leads in coding and reasoning benchmark tests.