GPT-5.3 Chat vs Grok Code Fast 1
Compare GPT-5.3 Chat by OpenAI against Grok Code Fast 1 by xAI, context windows of 128K vs 256K, tested across 53 shared challenges. Updated April 2026.
Which is better, GPT-5.3 Chat or Grok Code Fast 1?
GPT-5.3 Chat and Grok Code Fast 1 are both competitive models. GPT-5.3 Chat costs $1.75/M input tokens vs $0.2/M for Grok Code Fast 1. Context windows: 128K vs 256K tokens. Compare their real outputs side by side below.
Key Differences Between GPT-5.3 Chat and Grok Code Fast 1
GPT-5.3 Chat is made by openai while Grok Code Fast 1 is from xai. GPT-5.3 Chat has a 128K token context window compared to Grok Code Fast 1's 256K. On pricing, GPT-5.3 Chat costs $1.75/M input tokens vs $0.2/M for Grok Code Fast 1.
No community votes yet. On paper, GPT-5.3 Chat has the edge — bigger model tier, newer.
Grok Code Fast 1 is 9.3x cheaper per token — worth considering if cost matters.
Style Comparison
Grok Code Fast 1 uses 6.0x more emoji
vs
Ask 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.
