GPT-5.3-Codex vs OpenAI o4 Mini High
Compare GPT-5.3-Codex and OpenAI o4 Mini High, both from OpenAI, context windows of 400K vs 200K, tested across 53 shared challenges. Updated April 2026.
Which is better, GPT-5.3-Codex or OpenAI o4 Mini High?
GPT-5.3-Codex and OpenAI o4 Mini High are both competitive models. GPT-5.3-Codex costs $1.75/M input tokens vs $1.1/M for OpenAI o4 Mini High. Context windows: 400K vs 200K tokens. Compare their real outputs side by side below.
Key Differences Between GPT-5.3-Codex and OpenAI o4 Mini High
GPT-5.3-Codex is made by openai while OpenAI o4 Mini High is from openai. GPT-5.3-Codex has a 400K token context window compared to OpenAI o4 Mini High's 200K. On pricing, GPT-5.3-Codex costs $1.75/M input tokens vs $1.1/M for OpenAI o4 Mini High.
No community votes yet. On paper, GPT-5.3-Codex has the edge — bigger model tier, newer, bigger context window.
OpenAI o4 Mini High is 3.2x cheaper per token — worth considering if cost matters.
Style Comparison
GPT-5.3-Codex uses 654.6x more bold
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.
