DeepSeek Just Open-Sourced a Claude-Tier Model. The Pricing Math Breaks Everything.
DeepSeek V4-Pro landed April 24, 2026 with open weights, a 1M context window, and benchmarks within 0.2 points of Claude Opus 4.6. Output tokens cost $3.48 per million. Anthropic charges $25. Here is what actually shipped and what it means for every AI cost model in Q3.