How much cheaper is DeepSeek V4 Pro than GPT-5.5 Pro?

DeepSeek V4 Pro costs $0.435/$0.87 per 1M tokens while GPT-5.5 Pro costs $30/$180 per 1M tokens. DeepSeek V4 Pro is 99% cheaper on input and 99.5% cheaper on output. For 1M input + 500K output tokens/month, DeepSeek V4 Pro costs $0.87 vs GPT-5.5 Pro's $120 — saving $119.13/month.

Is GPT-5.5 Pro worth 68x the cost of DeepSeek V4 Pro?

GPT-5.5 Pro at $30/$180 is OpenAI's most powerful model with 1.05M context. DeepSeek V4 Pro at $0.435/$0.87 delivers remarkable quality at 99% lower cost with 1M context. For most production workloads, DeepSeek V4 Pro offers unbeatable value.

When should I use DeepSeek V4 Pro over GPT-5.5 Pro?

Choose DeepSeek V4 Pro ($0.435/$0.87) for virtually all production workloads — it's 68x cheaper with comparable 1M context. Choose GPT-5.5 Pro ($30/$180) only for the absolute most complex reasoning tasks where OpenAI's premium quality justifies 68x higher cost.