DeepSeek R1 vs GPT-5.1-Codex
Compare DeepSeek R1 by DeepSeek against GPT-5.1-Codex by OpenAI, context windows of 128K vs 400K, tested across 52 shared challenges. Updated May 2026.
Which is better, DeepSeek R1 or GPT-5.1-Codex?
DeepSeek R1 and GPT-5.1-Codex are both competitive models. DeepSeek R1 costs $0.55/M input tokens vs $1.25/M for GPT-5.1-Codex. Context windows: 128K vs 400K tokens. Compare their real outputs side by side below.
Key Differences Between DeepSeek R1 and GPT-5.1-Codex
DeepSeek R1 is made by deepseek while GPT-5.1-Codex is from openai. DeepSeek R1 has a 128K token context window compared to GPT-5.1-Codex's 400K. On pricing, DeepSeek R1 costs $0.55/M input tokens vs $1.25/M for GPT-5.1-Codex.
Per 1M tokens
DeepSeek R1 is cheaper on both — 2.3× input, 4.6× output
No community votes yet. On paper, GPT-5.1-Codex has the edge — bigger model tier, newer, bigger context window.
DeepSeek R1 is 4.6x cheaper per token — worth considering if cost matters.
Style Comparison
DeepSeek R1 uses 4.3x more emoji
