How much cheaper is DeepSeek V4 Flash than GPT-5?

DeepSeek V4 Flash costs $0.14/M input and $0.28/M output. GPT-5 costs $1.25/M input and $10/M output. DeepSeek V4 Flash is 89% cheaper on input and 97% cheaper on output. For a typical workload of 1M input + 500K output tokens/month, GPT-5 costs $6.25 vs DeepSeek V4 Flash's $0.28 — saving you $5.97/month (95% savings).

Which has a larger context window: GPT-5 or DeepSeek V4 Flash?

DeepSeek V4 Flash has a 1M token context window, while GPT-5 has a 272K token context window. DeepSeek offers 3.7x the context at a fraction of the price.

When should I choose GPT-5 over DeepSeek V4 Flash?

Choose GPT-5 when you need OpenAI's strongest reasoning, complex multi-step problem solving, or specific capabilities where GPT-5 excels (like nuanced creative writing or complex code architecture). Choose DeepSeek V4 Flash when cost is a primary concern — it's 89-97% cheaper with a larger context window, making it ideal for high-volume or budget-constrained workloads.

Is DeepSeek V4 Flash good enough to replace GPT-5?

For many use cases — yes. DeepSeek V4 Flash handles chatbots, summarization, classification, and code generation well at 95% lower cost. However, GPT-5 may still outperform on complex reasoning, nuanced creative tasks, and edge cases. Test both on your specific workload to decide if the quality tradeoff is worth the massive cost savings.