DeepSeek V4 Flash vs OpenAI o3
Compare DeepSeek V4 Flash by DeepSeek against OpenAI o3 by OpenAI, tested across 53 shared challenges. Updated April 2026.
Which is better, DeepSeek V4 Flash or OpenAI o3?
DeepSeek V4 Flash and OpenAI o3 are both competitive models. DeepSeek V4 Flash costs $0.14/M input tokens vs $10/M for OpenAI o3. Compare their real outputs side by side below.
Key Differences Between DeepSeek V4 Flash and OpenAI o3
DeepSeek V4 Flash is made by deepseek while OpenAI o3 is from openai. On pricing, DeepSeek V4 Flash costs $0.14/M input tokens vs $10/M for OpenAI o3.
Per 1M tokens
DeepSeek V4 Flash is cheaper on both — 71× input, 143× output
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
DeepSeek V4 Flash is 143x cheaper per token — worth considering if cost matters.
Style Comparison
DeepSeek V4 Flash uses 5.2x more bold
