GPT-5.3-Codex vs Grok 3 Mini Beta
Compare GPT-5.3-Codex by OpenAI against Grok 3 Mini Beta by xAI, context windows of 400K vs 131K, tested across 13 shared challenges. Updated April 2026.
Which is better, GPT-5.3-Codex or Grok 3 Mini Beta?
GPT-5.3-Codex and Grok 3 Mini Beta are both competitive models. GPT-5.3-Codex costs $1.75/M input tokens vs $0.4/M for Grok 3 Mini Beta. Context windows: 400K vs 131K tokens. Compare their real outputs side by side below.
Key Differences Between GPT-5.3-Codex and Grok 3 Mini Beta
GPT-5.3-Codex is made by openai while Grok 3 Mini Beta is from xai. GPT-5.3-Codex has a 400K token context window compared to Grok 3 Mini Beta's 131K. On pricing, GPT-5.3-Codex costs $1.75/M input tokens vs $0.4/M for Grok 3 Mini Beta.
No community votes yet. On paper, GPT-5.3-Codex has the edge — bigger model tier, newer, bigger context window.
Grok 3 Mini Beta is 18x cheaper per token — worth considering if cost matters.
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.
