Is DeepSeek V4 Pro cheaper than GPT-5.4 Pro?

Yes — DeepSeek V4 Pro is dramatically cheaper. It costs $0.435/M input and $0.87/M output, while GPT-5.4 Pro costs $30/M input and $180/M output. That's 98.6% cheaper on input and 99.5% cheaper on output.

How much would I save using DeepSeek V4 Pro instead of GPT-5.4 Pro?

For a workload of 1M input + 500K output tokens/month, DeepSeek V4 Pro costs $0.87/month vs GPT-5.4 Pro's $120/month — saving $119.13/month (99.3%). At scale (10M input + 5M output), you save $1,191/month — over $14,300/year.

When should I choose GPT-5.4 Pro over DeepSeek V4 Pro?

Choose GPT-5.4 Pro when: (1) you need the absolute best chain-of-thought reasoning, (2) you need guaranteed uptime SLAs, (3) you're in the OpenAI ecosystem and need tight integration. For cost-sensitive workloads, DeepSeek V4 Pro delivers solid quality at 99% lower cost.

Is DeepSeek V4 Pro good enough for production?

DeepSeek V4 Pro offers strong performance for most tasks including coding, summarization, and chat. With 1M context and pricing at $0.435/$0.87 per million tokens, it's the budget king of 2026. For mission-critical reasoning tasks, GPT-5.4 Pro may still have an edge.