DeepSeek V4 Pro vs GPT-5.4 Mini: which API costs less?
Averaged across three realistic workloads, DeepSeek V4 Pro is about 83% cheaper than GPT-5.4 Mini. Below: raw rates and side-by-side monthly costs, computed from prices verified 2026-07-05 (we track what you are billed today, promos included).
Rates per 1M tokens
| Model | Input | Output | Cached input |
|---|---|---|---|
| DeepSeek V4 ProDeepSeek | $0.435 | $0.870 | $0.015 |
| GPT-5.4 MiniOpenAI | $0.750 | $4.50 | — |
Monthly cost, side by side
| Workload | DeepSeek V4 Pro | GPT-5.4 Mini | Difference |
|---|---|---|---|
Customer-support chatbot 2M input + 0.5M output tokens/month, 60% of input served from prompt cache | $0.800 | $3.75 | DeepSeek V4 Pro −79% |
RAG / document Q&A 20M input + 1M output tokens/month, 70% cached (shared context) | $3.68 | $19.50 | DeepSeek V4 Pro −81% |
Agentic coding assistant 50M input + 5M output tokens/month, 80% cached (long sessions) | $9.28 | $60.00 | DeepSeek V4 Pro −85% |
Your traffic looks different? Run your own numbers in the calculator.
FAQ
Which is cheaper: DeepSeek V4 Pro or GPT-5.4 Mini?
Across three realistic workloads (chatbot, RAG, agent), DeepSeek V4 Pro works out about 83% cheaper than GPT-5.4 Mini on average. Raw rates: DeepSeek V4 Pro $0.435/$0.870 per 1M tokens vs GPT-5.4 Mini $0.750/$4.50. Verified 2026-07-05.
Does prompt caching change the comparison?
Yes — cached input costs $0.015 on DeepSeek V4 Pro and the full input rate on GPT-5.4 Mini (no cache discount listed). Our scenario numbers already include realistic cache hit rates.
Is cheaper always better?
No. Price is one axis — model capability, context window and latency differ. This page answers only the cost question; benchmark quality on your own tasks before switching.