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Grok 4 Fast vs o3
Comprehensive side-by-side LLM comparison
Grok 4 Fast leads with 1.1% higher average benchmark score. Grok 4 Fast offers 1.7M more tokens in context window than o3. Grok 4 Fast is $9.30 cheaper per million tokens. Both models have their strengths depending on your specific coding needs.
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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.
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OpenAI
o3 represents the next generation in OpenAI's reasoning model series, developed to advance the capabilities of deliberate, step-by-step problem solving. Built to handle increasingly complex challenges across mathematics, science, and coding, it continues the evolution of reasoning-focused AI with improved analytical depth and accuracy.
4 months newer
o3
OpenAI
2025-04-16
Grok 4 Fast
xAI
2025-08-28
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Pricing Comparison
Cost per million tokens (USD)
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Grok 4 Fast
Input:$0.20
Output:$0.50($9.30 cheaper)
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o3
Input:$2.00
Output:$8.00
Performance Metrics
Context window and performance specifications
Average performance across 3 common benchmarks
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Grok 4 Fast
Average Score:74.2%(+1.1%)
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o3
Average Score:73.1%
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Knowledge Cutoff
Training data recency comparison
o3
2024-05-31
More recent knowledge cutoff means awareness of newer technologies and frameworks
Provider Availability & Performance
Available providers and their performance metrics
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Grok 4 Fast
1 providers
xAI
Throughput: 90 tok/s
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o3
1 providers
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Grok 4 Fast
Avg Score:74.2%(+1.1%)
Providers:1
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o3
Avg Score:73.1%
Providers:1