GPT-5.3-Codex vs Gemini 3.1 Pro Preview
Compare GPT-5.3-Codex by OpenAI against Gemini 3.1 Pro Preview by Google AI, in 5 community votes, gemini 3.1 pro preview wins 80% of head-to-head duels, context windows of 400K vs 1.0M, tested across 53 shared challenges. Updated April 2026.
Which is better, GPT-5.3-Codex or Gemini 3.1 Pro Preview?
Gemini 3.1 Pro Preview is the better choice overall, winning 80% of 5 blind community votes on Rival. GPT-5.3-Codex costs $1.75/M input tokens vs $2/M for Gemini 3.1 Pro Preview. Context windows: 400K vs 1049K tokens. Compare their real outputs side by side below.
Key Differences Between GPT-5.3-Codex and Gemini 3.1 Pro Preview
GPT-5.3-Codex is made by openai while Gemini 3.1 Pro Preview is from google. GPT-5.3-Codex has a 400K token context window compared to Gemini 3.1 Pro Preview's 1049K. On pricing, GPT-5.3-Codex costs $1.75/M input tokens vs $2/M for Gemini 3.1 Pro Preview. In community voting, In 5 community votes, Gemini 3.1 Pro Preview wins 80% of head-to-head duels.
In 5 community votes, Gemini 3.1 Pro Preview wins 80% of head-to-head duels. Gemini 3.1 Pro Preview leads in Image Generation. Based on blind community voting from the Rival open dataset of 5+ human preference judgments for this pair.
Pick Gemini 3.1 Pro Preview. In 5 blind votes, Gemini 3.1 Pro Preview wins 80% of the time. That's not luck.
Gemini 3.1 Pro Preview particularly excels in Image Generation.
Style Comparison
GPT-5.3-Codex uses 15.8x more emoji
vsAsk them anything yourself
Some models write identically. You are paying for the brand.
178 models fingerprinted across 32 writing dimensions. Free research.
185x
price gap between models that write identically
178
models
12
clone pairs
32
dimensions
279 AI models invented the same fake scientist.
We read every word. 250 models. 2.14 million words. This is what we found.
