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Grok 4.1 Fast vs Kimi K2
Comprehensive side-by-side LLM comparison
Grok 4.1 Fast offers 1.8M more tokens in context window than Kimi K2. Kimi K2 is $2.90 cheaper per million tokens. Grok 4.1 Fast supports multimodal inputs. Both models have their strengths depending on your specific coding needs.
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xAI
Grok 4.1 Fast, released by xAI in November 2025, is a fast-response variant from the Grok 4 family featuring a 2M token context window designed for high-throughput applications. It omits thinking tokens for immediate responses, reducing latency while maintaining strong output quality. Grok 4.1 Fast targets production APIs, real-time assistants, and cost-sensitive applications requiring long-context understanding at high volume.
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Moonshot AI
Kimi K2, released by Moonshot AI on July 11, 2025, is an open-weight Mixture-of-Experts large language model with 1 trillion total parameters and 32 billion active parameters per inference. It features a 256K token context window (expanded from 128K in an September 2025 update) and demonstrated strong performance on agentic coding benchmarks. Kimi K2 targets software engineering agents, tool-use workflows, and open-source deployments under a modified MIT license.
4 months newer
Kimi K2
Moonshot AI
2025-07-11
Grok 4.1 Fast
xAI
2025-11-17
Pricing Comparison
Cost per million tokens (USD)
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Grok 4.1 Fast
Input:$1.00
Output:$5.00
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Kimi K2
Input:$0.60
Output:$2.50($2.90 cheaper)
Performance Metrics
Context window and performance specifications
Provider Availability & Performance
Available providers and their performance metrics
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Grok 4.1 Fast
1 providers
xAI
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Kimi K2
1 providers
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Grok 4.1 Fast
Avg Score:0.0%
Providers:1
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Kimi K2
Avg Score:0.0%
Providers:1