I analyzed 922 agentic task trace and found the secret weapon of DeepSeek v4

I recently did a benchmark of deepseek v4 in agentic tasks. Performance-wise, it's one of the best open source models, as expected. What really surprised me is the cost. I mean I know it's cheap, but it's cheap in a way that doesn't really make sense. Cost Estimation Let's take v4 flash as example since it's not on sale (so it can better reflect the actual provider cost). deepseek v4 flash price on openrouter opus 4.7 price on openrouter Looking at OpenRouter price, deepseek v4 flash price is about 0.03x opus 4.7 price.