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Grok 4 Fast vs Kimi K2 Instruct
Comprehensive side-by-side LLM comparison
Grok 4 Fast leads with 42.9% higher average benchmark score. Grok 4 Fast offers 1.8M more tokens in context window than Kimi K2 Instruct. Grok 4 Fast is $2.17 cheaper per million tokens. Grok 4 Fast supports multimodal inputs. Overall, Grok 4 Fast is the stronger choice for coding tasks.
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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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Moonshot AI
Kimi K2 Instruct was developed as the instruction-tuned version of Kimi K2, designed to follow user instructions reliably across diverse tasks. Built to serve general-purpose conversational and task-completion applications, it provides Moonshot's accessible interface for language AI.
1 month newer
Kimi K2 Instruct
Moonshot AI
2025-07-11
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($2.17 cheaper)
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Kimi K2 Instruct
Input:$0.57
Output:$2.30
Performance Metrics
Context window and performance specifications
Average performance across 4 common benchmarks
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Grok 4 Fast
Average Score:91.5%(+42.9%)
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Kimi K2 Instruct
Average Score:48.6%
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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Kimi K2 Instruct
1 providers
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Grok 4 Fast
Avg Score:91.5%(+42.9%)
Providers:1
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Kimi K2 Instruct
Avg Score:48.6%
Providers:1