Grok 4.5 vs GPT 5.5 Pro
xAI's Opus-class flagship for frontier coding, agentic tool use, and knowledge work.
OpenAI's high-capability model optimized for deep reasoning and accuracy on complex, high-stakes workloads.
No captured outputs for these models yet.
Frequently Asked Questions: Grok 4.5 vs GPT 5.5 Pro▼
Which is better, Grok 4.5 or GPT 5.5 Pro?
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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, Grok 4.5 or GPT 5.5 Pro?
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Grok 4.5 has a lower blended cost. Grok 4.5: $2.00 input / $6.00 output. GPT 5.5 Pro: $30.00 input / $180.00 output.
Which has a larger context window, Grok 4.5 or GPT 5.5 Pro?
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GPT 5.5 Pro has a larger context window: Grok 4.5 supports 500K tokens vs GPT 5.5 Pro at 1.1M tokens.
Do both Grok 4.5 and GPT 5.5 Pro support vision?
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Yes, both Grok 4.5 and GPT 5.5 Pro support vision/image input.
What are the key differences between Grok 4.5 and GPT 5.5 Pro?
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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 Grok 4.5 and GPT 5.5 Pro for free on idapt.app to see which performs better for your specific needs.