xAI: Grok 4 Fast (free) vs GPT-5 Codex - AI Model Comparison
Compare capabilities and responses between xAI: Grok 4 Fast (free) by xai and GPT-5 Codex by openai.
Common Challenges (34)
- Estimate Complexity: Tests an AI's ability to make educated estimates based on technical knowledge...
- AI Board Game Logic: Tests an AI's ability to understand game rules and strategy...
- Logic Puzzle: Tests an AI's ability to solve a simple but potentially confusing logic puzzle...
- Math Misconception Test: Tests an AI's understanding of number representation...
- Stochastic Consistency Test: Tests an AI's randomness and creativity...
- And 29 more challenges...
About xAI: Grok 4 Fast (free)
Provider: xai
Release Date: 2025-09-19
Context Window: 2000000
About GPT-5 Codex
Provider: openai
Release Date: 2025-09-23
Context Window:
xAI: Grok 4 Fast (free)vsGPT-5 Codex
Comparing across 34 challenges
conversationanalysiscode generation
conversationreasoningcode generation+1
Battle Arena
0/34 challenges loaded
Loading more challenges...0/34 
