Grok 4.5 vs Claude Sonnet 4.5
xAI's Opus-class flagship for frontier coding, agentic tool use, and knowledge work.
High-performance model for real-world agents and coding.
No captured outputs for these models yet.
Frequently Asked Questions: Grok 4.5 vs Claude Sonnet 4.5▼
Which is better, Grok 4.5 or Claude Sonnet 4.5?
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Based on the Capability Index, Grok 4.5 scores higher (88.5 vs 78.9). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.
Which is cheaper, Grok 4.5 or Claude Sonnet 4.5?
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Grok 4.5 has a lower blended cost. Grok 4.5: $2.00 input / $6.00 output. Claude Sonnet 4.5: $3.00 input / $15.00 output.
Which has a larger context window, Grok 4.5 or Claude Sonnet 4.5?
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Claude Sonnet 4.5 has a larger context window: Grok 4.5 supports 500K tokens vs Claude Sonnet 4.5 at 1M tokens.
Do both Grok 4.5 and Claude Sonnet 4.5 support vision?
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Yes, both Grok 4.5 and Claude Sonnet 4.5 support vision/image input.
What are the key differences between Grok 4.5 and Claude Sonnet 4.5?
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Key differences: Grok 4.5 has a notably higher capability index (9.6 point gap). 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 Claude Sonnet 4.5 for free on idapt.app to see which performs better for your specific needs.