xAI: Grok 4 Fast (free) vs Polaris Alpha
Compare xAI: Grok 4 Fast (free) by xAI against Polaris Alpha by OpenRouter, context windows of 2.0M vs 256K, tested across 35 shared challenges. Updated April 2026.
Which is better, xAI: Grok 4 Fast (free) or Polaris Alpha?
xAI: Grok 4 Fast (free) and Polaris Alpha are both competitive models. xAI: Grok 4 Fast (free) costs $0/M input tokens vs $0/M for Polaris Alpha. Context windows: 2000K vs 256K tokens. Compare their real outputs side by side below.
Key Differences Between xAI: Grok 4 Fast (free) and Polaris Alpha
xAI: Grok 4 Fast (free) is made by xai while Polaris Alpha is from openrouter. xAI: Grok 4 Fast (free) has a 2000K token context window compared to Polaris Alpha's 256K. On pricing, xAI: Grok 4 Fast (free) costs $0/M input tokens vs $0/M for Polaris Alpha.
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Style Comparison
xAI: Grok 4 Fast (free) uses 138.0x 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.
