Aurora Alpha vs Claude Sonnet 4.5
Compare Aurora Alpha by OpenRouter against Claude Sonnet 4.5 by Anthropic, context windows of 128K vs 200K, tested across 42 shared challenges. Updated May 2026.
Which is better, Aurora Alpha or Claude Sonnet 4.5?
Aurora Alpha and Claude Sonnet 4.5 are both competitive models. Aurora Alpha costs $0/M input tokens vs $3/M for Claude Sonnet 4.5. Context windows: 128K vs 200K tokens. Compare their real outputs side by side below.
Key Differences Between Aurora Alpha and Claude Sonnet 4.5
Aurora Alpha is made by openrouter while Claude Sonnet 4.5 is from anthropic. Aurora Alpha has a 128K token context window compared to Claude Sonnet 4.5's 200K. On pricing, Aurora Alpha costs $0/M input tokens vs $3/M for Claude Sonnet 4.5.
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
Claude Sonnet 4.5 uses 4.5x more emoji
