How much cheaper is DeepSeek V4 Flash than GPT-5.4 nano?

DeepSeek V4 Flash costs $0.22/$0.66 per 1M tokens while GPT-5.4 nano costs $0.20/$1.25 per 1M tokens. DeepSeek V4 Flash is 30% cheaper on input and 78% cheaper on output. For 1M input + 500K output tokens/month, DeepSeek V4 Flash costs $0.28 vs GPT-5.4 nano's $0.83 — saving $0.55/month.

Is GPT-5.4 nano worth 2x the cost of DeepSeek V4 Flash?

GPT-5.4 nano at $0.20/$1.25 is OpenAI's cheapest model with 400K context. DeepSeek V4 Flash at $0.22/$0.66 is the cheapest AI API available with 1M context. DeepSeek V4 Flash offers better value with larger context and lower cost.

When should I use DeepSeek V4 Flash over GPT-5.4 nano?

Choose DeepSeek V4 Flash ($0.22/$0.66) for virtually all budget workloads — it's the cheapest AI API available with 1M context. Choose GPT-5.4 nano ($0.20/$1.25) only if you specifically need OpenAI's ecosystem integration or 400K context for nano-specific optimizations.