GPT 5 Nano vs Grok 4.5
Ultra-fast and lightweight GPT-5 variant for low-latency tasks.
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 Nano vs Grok 4.5▼
Which is better, GPT 5 Nano or Grok 4.5?
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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, GPT 5 Nano or Grok 4.5?
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GPT 5 Nano has a lower blended cost. GPT 5 Nano: $0.05 input / $0.40 output. Grok 4.5: $2.00 input / $6.00 output.
Which has a larger context window, GPT 5 Nano or Grok 4.5?
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Grok 4.5 has a larger context window: GPT 5 Nano supports 400K tokens vs Grok 4.5 at 500K tokens.
Do both GPT 5 Nano and Grok 4.5 support vision?
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Yes, both GPT 5 Nano and Grok 4.5 support vision/image input.
What are the key differences between GPT 5 Nano and Grok 4.5?
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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 GPT 5 Nano and Grok 4.5 for free on idapt.app to see which performs better for your specific needs.