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Grok 4.1 Fast vs Kimi K2 Thinking
Comprehensive side-by-side LLM comparison
Grok 4.1 Fast offers 1.8M more tokens in context window than Kimi K2 Thinking. Kimi K2 Thinking is $1.00 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 Thinking, released by Moonshot AI on November 6, 2025, is a reasoning-focused variant of Kimi K2 with 1 trillion total parameters and 32 billion active parameters, featuring extended chain-of-thought processing for complex problem solving. It builds on K2's agentic coding strengths with additional capabilities for mathematical and scientific reasoning. Kimi K2 Thinking targets open-source deployments requiring deep, deliberate reasoning across coding and analytical domains.
11 days newer
Kimi K2 Thinking
Moonshot AI
2025-11-06
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 Thinking
Input:$1.00
Output:$4.00($1.00 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 Thinking
1 providers
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Grok 4.1 Fast
Avg Score:0.0%
Providers:1
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Kimi K2 Thinking
Avg Score:0.0%
Providers:1