Gemini 2.5 Pro Preview 06-05 vs GPT-5.1-Codex
Compare Gemini 2.5 Pro Preview 06-05 by Google AI against GPT-5.1-Codex by OpenAI, context windows of 1.0M vs 400K, tested across 43 shared challenges. Updated April 2026.
Which is better, Gemini 2.5 Pro Preview 06-05 or GPT-5.1-Codex?
Gemini 2.5 Pro Preview 06-05 and GPT-5.1-Codex are both competitive models. Gemini 2.5 Pro Preview 06-05 costs $1.25/M input tokens vs $1.25/M for GPT-5.1-Codex. Context windows: 1049K vs 400K tokens. Compare their real outputs side by side below.
Key Differences Between Gemini 2.5 Pro Preview 06-05 and GPT-5.1-Codex
Gemini 2.5 Pro Preview 06-05 is made by google while GPT-5.1-Codex is from openai. Gemini 2.5 Pro Preview 06-05 has a 1049K token context window compared to GPT-5.1-Codex's 400K. On pricing, Gemini 2.5 Pro Preview 06-05 costs $1.25/M input tokens vs $1.25/M for GPT-5.1-Codex.
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Style Comparison
GPT-5.1-Codex uses 7.5x more transitions
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.
