xAI: Grok 4 vs xAI: Grok 4 Fast (free)
Compare xAI: Grok 4 and xAI: Grok 4 Fast (free), both from xAI, in 2 community votes, xai: grok 4 and xai: grok 4 fast (free) are closely matched, context windows of 256K vs 2.0M, tested across 34 shared challenges. Updated May 2026.
Which is better, xAI: Grok 4 or xAI: Grok 4 Fast (free)?
xAI: Grok 4 and xAI: Grok 4 Fast (free) are closely matched based on 2 community votes. xAI: Grok 4 costs $3/M input tokens vs $0/M for xAI: Grok 4 Fast (free). Context windows: 256K vs 2000K tokens. Compare their real outputs side by side below.
Key Differences Between xAI: Grok 4 and xAI: Grok 4 Fast (free)
xAI: Grok 4 is made by xai while xAI: Grok 4 Fast (free) is from xai. xAI: Grok 4 has a 256K token context window compared to xAI: Grok 4 Fast (free)'s 2000K. On pricing, xAI: Grok 4 costs $3/M input tokens vs $0/M for xAI: Grok 4 Fast (free). In community voting, In 2 community votes, xAI: Grok 4 and xAI: Grok 4 Fast (free) are closely matched.
In 2 community votes, xAI: Grok 4 and xAI: Grok 4 Fast (free) are closely matched. Based on blind community voting from the Rival open dataset of 2+ human preference judgments for this pair.
Per 1M tokens
Votes are tied. xAI: Grok 4 Fast (free) is newer and likely incorporates more recent improvements.
Style Comparison
xAI: Grok 4 uses 7.0x more emoji
