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.
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.
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
Cost per million tokens (USD)
Grok 4.1 Fast
Kimi K2 Thinking
Context window and performance specifications
Available providers and their performance metrics
Grok 4.1 Fast
xAI
Kimi K2 Thinking
Grok 4.1 Fast
Kimi K2 Thinking
Grok 4.1 Fast
Kimi K2 Thinking
Moonshot AI