What is the difference between DeepSeek V4 Flash and GPT-5?

DeepSeek V4 Flash is developed by DeepSeek while GPT-5 is developed by OpenAI. DeepSeek V4 Flash has a 1.0M token context window vs GPT-5's 400K. You can compare their actual outputs across 51 challenges on Rival to see how they differ in practice.

Which is better, DeepSeek V4 Flash or GPT-5?

It depends on your use case. DeepSeek V4 Flash and GPT-5 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 51 challenges so you can judge which fits your needs best.

How much does DeepSeek V4 Flash cost compared to GPT-5?

DeepSeek V4 Flash costs $0.14/M input tokens and GPT-5 costs $1.25/M input tokens. DeepSeek V4 Flash is $1.11/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare DeepSeek V4 Flash and GPT-5 on Rival?

This page shows a side-by-side comparison of DeepSeek V4 Flash and GPT-5 across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

Updated Apr 2026

DeepSeek V4 FlashvsGPT-5

DeepSeek V4 Flash is cheaper than GPT-5 at $0.14/M vs $1.25/M input tokens.

DeepSeek V4 Flash and GPT-5 compared across 51 shared prompts
Spec	DeepSeek V4 Flash	GPT-5
Input price	$0.14/M tokens	$1.25/M tokens
Output price	$0.28/M tokens	$10/M tokens
Context window	1.0M tokens	400K tokens
Weights	Open	Closed
Free API (OpenRouter)	No	No
Released	Apr 2026	Aug 2025