DeepSeek V4 Pro at $0.44/$0.87/M (discounted) is the most cost-efficient model for high-volume writing tasks in July 2026. V4 Flash at $0.14/$0.28/M works for simpler writing and content generation. With thinking mode ON by default, V4 Pro works through complex writing tasks — structure, argument, tone — before producing output. These prompts are optimised for the DeepSeek API post-July 24 migration.
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