DeepSeek R1 vs GPT-5.5
Compare DeepSeek R1 by DeepSeek against GPT-5.5 by OpenAI, context windows of 128K vs 1.1M, tested across 53 shared challenges. Updated April 2026.
Which is better, DeepSeek R1 or GPT-5.5?
DeepSeek R1 and GPT-5.5 are both competitive models. DeepSeek R1 costs $0.55/M input tokens vs $5/M for GPT-5.5. Context windows: 128K vs 1050K tokens. Compare their real outputs side by side below.
Key Differences Between DeepSeek R1 and GPT-5.5
DeepSeek R1 is made by deepseek while GPT-5.5 is from openai. DeepSeek R1 has a 128K token context window compared to GPT-5.5's 1050K. On pricing, DeepSeek R1 costs $0.55/M input tokens vs $5/M for GPT-5.5.
Per 1M tokens
DeepSeek R1 is cheaper on both — 9.1× input, 14× output
No community votes yet. On paper, GPT-5.5 has the edge — bigger model tier, newer, bigger context window.
DeepSeek R1 is 14x cheaper per token — worth considering if cost matters.
Style Comparison
DeepSeek R1 uses 4.3x more emoji
