DeepSeek V4 Pro vs GPT-5.4 Mini: which API costs less?
Averaged across three realistic workloads, GPT-5.4 Mini is about 9% cheaper than DeepSeek V4 Pro. Below: raw rates and side-by-side monthly costs, computed from prices verified 2026-10-17 (we track what you are billed today, promos included).
Rates per 1M tokens
| Model | Input | Output | Cached input |
|---|---|---|---|
| DeepSeek V4 ProDeepSeek | $1.32 | $3.96 | $0.044 |
| GPT-5.4 MiniOpenAI | $0.750 | $4.50 | $0.075 |
DeepSeek V4 Pro: Peak-hour price (01-04 and 06-10 UTC, Mon-Fri); off-peak costs half.
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 | $3.09 | $2.94 | GPT-5.4 Mini −5% |
RAG / document Q&A 20M input + 1M output tokens/month, 70% cached (shared context) | $12.50 | $10.05 | GPT-5.4 Mini −20% |
Agentic coding assistant 50M input + 5M output tokens/month, 80% cached (long sessions) | $34.76 | $33.00 | GPT-5.4 Mini −5% |
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), GPT-5.4 Mini works out about 9% cheaper than DeepSeek V4 Pro on average. Raw rates: DeepSeek V4 Pro $1.32/$3.96 per 1M tokens vs GPT-5.4 Mini $0.750/$4.50. Verified 2026-10-17.
Does prompt caching change the comparison?
Yes — cached input costs $0.044 on DeepSeek V4 Pro and $0.075 on GPT-5.4 Mini. 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.