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GPT-4.5 vs Grok 4 Fast
Comprehensive side-by-side LLM comparison
Grok 4 Fast leads with 24.4% higher average benchmark score. Grok 4 Fast offers 1.9M more tokens in context window than GPT-4.5. Grok 4 Fast is $224.30 cheaper per million tokens. Overall, Grok 4 Fast is the stronger choice for coding tasks.
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OpenAI
GPT-4.5 was developed as an intermediate advancement between GPT-4 and GPT-5, designed to incorporate incremental improvements in reasoning, factuality, and instruction-following. Built to bridge generational capabilities while maintaining compatibility with existing applications, it represents a refinement of the GPT-4 architecture with enhanced performance characteristics.
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xAI
Grok 4 Fast is a multimodal language model developed by xAI. It achieves strong performance with an average score of 73.0% across 7 benchmarks. It excels particularly in SimpleQA (95.0%), HMMT 2025 (93.3%), AIME 2025 (92.0%). With a 2.0M token context window, it can handle extensive documents and complex multi-turn conversations. The model is available through 1 API provider. As a multimodal model, it can process and understand text, images, and other input formats seamlessly. Released in 2025, it represents xAI's latest advancement in AI technology.
6 months newer
GPT-4.5
OpenAI
2025-02-27
Grok 4 Fast
xAI
2025-08-28
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Pricing Comparison
Cost per million tokens (USD)
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GPT-4.5
Input:$75.00
Output:$150.00
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Grok 4 Fast
Input:$0.20
Output:$0.50($224.30 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 2 common benchmarks
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GPT-4.5
Average Score:66.0%
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Grok 4 Fast
Average Score:90.3%(+24.4%)
Provider Availability & Performance
Available providers and their performance metrics
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GPT-4.5
1 providers
OpenAI
Throughput: 50 tok/s
Latency: 20ms
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Grok 4 Fast
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GPT-4.5
Avg Score:66.0%
Providers:1
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Grok 4 Fast
Avg Score:90.3%(+24.4%)
Providers:1