Gemini 2.5 Pro Experimental vs GPT-5.3-Codex
Compare Gemini 2.5 Pro Experimental by Google AI against GPT-5.3-Codex by OpenAI, context windows of 1.0M vs 400K, tested across 42 shared challenges. Updated April 2026.
Which is better, Gemini 2.5 Pro Experimental or GPT-5.3-Codex?
Gemini 2.5 Pro Experimental and GPT-5.3-Codex are both competitive models. Gemini 2.5 Pro Experimental costs $1/M input tokens vs $1.75/M for GPT-5.3-Codex. Context windows: 1000K vs 400K tokens. Compare their real outputs side by side below.
Key Differences Between Gemini 2.5 Pro Experimental and GPT-5.3-Codex
Gemini 2.5 Pro Experimental is made by google while GPT-5.3-Codex is from openai. Gemini 2.5 Pro Experimental has a 1000K token context window compared to GPT-5.3-Codex's 400K. On pricing, Gemini 2.5 Pro Experimental costs $1/M input tokens vs $1.75/M for GPT-5.3-Codex.
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Gemini 2.5 Pro Experimental is 7.0x cheaper per token — worth considering if cost matters.
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.
