What is the difference between DeepSeek V4 Flash and OpenAI o3?

DeepSeek V4 Flash is developed by DeepSeek while OpenAI o3 is developed by OpenAI. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, DeepSeek V4 Flash or OpenAI o3?

It depends on your use case. DeepSeek V4 Flash and OpenAI o3 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 53 challenges so you can judge which fits your needs best.

How much does DeepSeek V4 Flash cost compared to OpenAI o3?

DeepSeek V4 Flash costs $0.14/M input tokens and OpenAI o3 costs $10/M input tokens. DeepSeek V4 Flash is $9.86/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 OpenAI o3 on Rival?

This page shows a side-by-side comparison of DeepSeek V4 Flash and OpenAI o3 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 FlashvsOpenAI o3

DeepSeek V4 Flash is cheaper than OpenAI o3 at $0.14/M vs $10/M input tokens.

DeepSeek V4 Flash and OpenAI o3 compared across 53 shared prompts
Spec	DeepSeek V4 Flash	OpenAI o3
Input price	$0.14/M tokens	$10/M tokens
Output price	$0.28/M tokens	$40/M tokens
Context window	1.0M tokens	—
Weights	Open	Closed
Free API (OpenRouter)	No	No
Released	Apr 2026	Apr 2025