GPT 4o vs Grok 4.5
OpenAI's original omni model supporting text and image inputs.
xAI's Opus-class flagship for frontier coding, agentic tool use, and knowledge work.
No captured outputs for these models yet.
Frequently Asked Questions: GPT 4o vs Grok 4.5▼
Which is better, GPT 4o or Grok 4.5?
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Based on the Capability Index, Grok 4.5 scores higher (88.5 vs 63.0). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.
Which is cheaper, GPT 4o or Grok 4.5?
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Grok 4.5 has a lower blended cost. GPT 4o: $2.50 input / $10.00 output. Grok 4.5: $2.00 input / $6.00 output.
Which has a larger context window, GPT 4o or Grok 4.5?
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Grok 4.5 has a larger context window: GPT 4o supports 128K tokens vs Grok 4.5 at 500K tokens.
Do both GPT 4o and Grok 4.5 support vision?
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Yes, both GPT 4o and Grok 4.5 support vision/image input.
What are the key differences between GPT 4o and Grok 4.5?
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Key differences: Grok 4.5 has a notably higher capability index (25.5 point gap); only Grok 4.5 offers extended reasoning mode. Compare full specs on this page.
Which model should I choose for my use case?
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If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both GPT 4o and Grok 4.5 for free on idapt.app to see which performs better for your specific needs.