Google: Gemini 2.5 Flash Preview 09-2025 vs GPT-5.3-Codex
Compare Google: Gemini 2.5 Flash Preview 09-2025 by Google AI against GPT-5.3-Codex by OpenAI, context windows of 1.0M vs 400K, tested across 50 shared challenges. Updated April 2026.
Which is better, Google: Gemini 2.5 Flash Preview 09-2025 or GPT-5.3-Codex?
Google: Gemini 2.5 Flash Preview 09-2025 and GPT-5.3-Codex are both competitive models. Google: Gemini 2.5 Flash Preview 09-2025 costs $0.3/M input tokens vs $1.75/M for GPT-5.3-Codex. Context windows: 1049K vs 400K tokens. Compare their real outputs side by side below.
Key Differences Between Google: Gemini 2.5 Flash Preview 09-2025 and GPT-5.3-Codex
Google: Gemini 2.5 Flash Preview 09-2025 is made by google while GPT-5.3-Codex is from openai. Google: Gemini 2.5 Flash Preview 09-2025 has a 1049K token context window compared to GPT-5.3-Codex's 400K. On pricing, Google: Gemini 2.5 Flash Preview 09-2025 costs $0.3/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.
Google: Gemini 2.5 Flash Preview 09-2025 is 5.6x cheaper per token — worth considering if cost matters.
Style Comparison
Google: Gemini 2.5 Flash Preview 09-2025 uses 7.8x more transitions
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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
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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.
