GPT 5.5 Pro vs Grok 4.5
OpenAI's high-capability model optimized for deep reasoning and accuracy on complex, high-stakes workloads.
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 5.5 Pro vs Grok 4.5▼
Which is better, GPT 5.5 Pro or Grok 4.5?
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Based on the Capability Index, GPT 5.5 Pro scores higher (91.8 vs 88.5). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.
Which is cheaper, GPT 5.5 Pro or Grok 4.5?
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Grok 4.5 has a lower blended cost. GPT 5.5 Pro: $30.00 input / $180.00 output. Grok 4.5: $2.00 input / $6.00 output.
Which has a larger context window, GPT 5.5 Pro or Grok 4.5?
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GPT 5.5 Pro has a larger context window: GPT 5.5 Pro supports 1.1M tokens vs Grok 4.5 at 500K tokens.
Do both GPT 5.5 Pro and Grok 4.5 support vision?
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Yes, both GPT 5.5 Pro and Grok 4.5 support vision/image input.
What are the key differences between GPT 5.5 Pro and Grok 4.5?
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Key differences: Grok 4.5 is significantly cheaper. 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 5.5 Pro and Grok 4.5 for free on idapt.app to see which performs better for your specific needs.