Aurora Alpha vs xAI: Grok 4 Fast (free)
Compare Aurora Alpha by OpenRouter against xAI: Grok 4 Fast (free) by xAI, context windows of 128K vs 2.0M, tested across 34 shared challenges. Updated May 2026.
Which is better, Aurora Alpha or xAI: Grok 4 Fast (free)?
Aurora Alpha and xAI: Grok 4 Fast (free) are both competitive models. Aurora Alpha costs $0/M input tokens vs $0/M for xAI: Grok 4 Fast (free). Context windows: 128K vs 2000K tokens. Compare their real outputs side by side below.
Key Differences Between Aurora Alpha and xAI: Grok 4 Fast (free)
Aurora Alpha is made by openrouter while xAI: Grok 4 Fast (free) is from xai. Aurora Alpha has a 128K token context window compared to xAI: Grok 4 Fast (free)'s 2000K. On pricing, Aurora Alpha costs $0/M input tokens vs $0/M for xAI: Grok 4 Fast (free).
Per 1M tokens
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Style Comparison
Aurora Alpha uses 10.0x more emoji
