GPT-4.5 vs Quasar Alpha
Compare GPT-4.5 by OpenAI against Quasar Alpha by OpenRouter, context windows of 128K vs 1.0M, tested across 6 shared challenges. Updated April 2026.
Which is better, GPT-4.5 or Quasar Alpha?
GPT-4.5 and Quasar Alpha are both competitive models. Context windows: 128K vs 1000K tokens. Compare their real outputs side by side below.
Key Differences Between GPT-4.5 and Quasar Alpha
GPT-4.5 is made by openai while Quasar Alpha is from openrouter. GPT-4.5 has a 128K token context window compared to Quasar Alpha's 1000K.
Our Verdict
GPT-4.5
Quasar Alpha
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Too close to call
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279 AI models invented the same fake scientist.
We read every word. 250 models. 2.14 million words. This is what we found.
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