GPT-5.1 vs GPT-5.1-Codex
Compare GPT-5.1 and GPT-5.1-Codex, both from OpenAI, in 11 community votes, gpt-5.1 wins 56% of head-to-head duels, context windows of 400K vs 400K, tested across 52 shared challenges. Updated April 2026.
Which is better, GPT-5.1 or GPT-5.1-Codex?
GPT-5.1 is the better choice overall, winning 56% of 11 blind community votes on Rival. GPT-5.1 costs $1.25/M input tokens vs $1.25/M for GPT-5.1-Codex. Context windows: 400K vs 400K tokens. Compare their real outputs side by side below.
Key Differences Between GPT-5.1 and GPT-5.1-Codex
GPT-5.1 is made by openai while GPT-5.1-Codex is from openai. GPT-5.1 has a 400K token context window compared to GPT-5.1-Codex's 400K. On pricing, GPT-5.1 costs $1.25/M input tokens vs $1.25/M for GPT-5.1-Codex. In community voting, In 11 community votes, GPT-5.1 wins 56% of head-to-head duels.
In 11 community votes, GPT-5.1 wins 56% of head-to-head duels. GPT-5.1 leads in Web Design, while GPT-5.1-Codex leads in Reasoning. Based on blind community voting from the Rival open dataset of 11+ human preference judgments for this pair.
GPT-5.1 has the edge overall. In 11 blind votes, GPT-5.1 wins 56% of the time.
Pick GPT-5.1 for Web Design. Pick GPT-5.1-Codex for Reasoning.
Style Comparison
GPT-5.1-Codex uses 14.0x more transitions
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