Originally published on the NovAI Blog . I've been paying $200-500/month for GPT-5.5 API calls. Last week, I ran the same workloads through DeepSeek V4 Pro at $0.27/1M tokens â 1/18th the price. Here's what happened. The Numbers That Made Me Switch 10 million tokens per month: Model Input/1M Output/1M Monthly Cost GPT-5.5 $5.00 $15.00 ~$100 Claude Opus 4.7 $5.00 $30.00 ~$175 DeepSeek V4 Pro $0.27 $1.10 ~$7 $100 vs $7. Coding: DeepSeek Wins All 10 coding tasks solved correctly. DeepSeek's code was more concise, handled edge cases better, and was actually faster â median 2.1s vs GPT-5.5's 3.8s. I'd pick DeepSeek for coding even if prices were equal. Reasoning: Tie GPT-5.5 excels at nuanced analysis. DeepSeek matches it on structured logic. But DeepSeek stops when done â GPT-5.5 often over-explains. On per-token billing, that matters. Creative: GPT-5.5 Still Better For marketing copy and anything requiring "voice" â GPT-5.5 produces more natural English. Worth the premium if your audience is US-based.…
