Grok 4.5 vs GPT 5 Nano
xAI's Opus-class flagship for frontier coding, agentic tool use, and knowledge work.
Ultra-fast and lightweight GPT-5 variant for low-latency tasks.
No captured outputs for these models yet.
Frequently Asked Questions: Grok 4.5 vs GPT 5 Nano▼
Which is better, Grok 4.5 or GPT 5 Nano?
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Based on the Capability Index, Grok 4.5 scores higher (88.5 vs 73.4). 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 Nano?
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GPT 5 Nano has a lower blended cost. Grok 4.5: $2.00 input / $6.00 output. GPT 5 Nano: $0.05 input / $0.40 output.
Which has a larger context window, Grok 4.5 or GPT 5 Nano?
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Grok 4.5 has a larger context window: Grok 4.5 supports 500K tokens vs GPT 5 Nano at 400K tokens.
Do both Grok 4.5 and GPT 5 Nano support vision?
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Yes, both Grok 4.5 and GPT 5 Nano support vision/image input.
What are the key differences between Grok 4.5 and GPT 5 Nano?
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Key differences: Grok 4.5 has a notably higher capability index (15.1 point gap); GPT 5 Nano 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 Nano for free on idapt.app to see which performs better for your specific needs.