DeepSeek V4 is the MIT-licensed open-weight family that replaced the never-released R2, pairing a one-million-token context window with sub-dollar output pricing. This complete guide covers the V4 Pro 0813 and V4 Flash 0731 GA builds, their official benchmarks, the peak/off-peak billing change landing on 16 August 2026, and a practical framework for choosing between the two models.
GPT-5.6 Sol is OpenAI’s flagship model, launched publicly on 9 July 2026 alongside Terra and Luna. This guide maps the tier scheme, the full API price list including the 272K long-context surcharge, honest benchmarks against Anthropic’s Claude, and availability across ChatGPT plans and cloud platforms. It closes with what the Doug pre-training project and Astra signal about GPT-6.
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