GPT-4.5 vs Kimi K2 Thinking
Compare GPT-4.5 by OpenAI against Kimi K2 Thinking by Moonshot AI, context windows of 128K vs 262K, tested across 24 shared challenges. Updated April 2026.
Which is better, GPT-4.5 or Kimi K2 Thinking?
GPT-4.5 and Kimi K2 Thinking are both competitive models. GPT-4.5 costs $75/M input tokens vs $0.6/M for Kimi K2 Thinking. Context windows: 128K vs 262K tokens. Compare their real outputs side by side below.
Key Differences Between GPT-4.5 and Kimi K2 Thinking
GPT-4.5 is made by openai while Kimi K2 Thinking is from moonshotai. GPT-4.5 has a 128K token context window compared to Kimi K2 Thinking's 262K. On pricing, GPT-4.5 costs $75/M input tokens vs $0.6/M for Kimi K2 Thinking.
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Kimi K2 Thinking is 60x cheaper per token — worth considering if cost matters.
Style Comparison
GPT-4.5 uses 9.5x more transitions
vsAsk them anything yourself
Some models write identically. You are paying for the brand.
178 models fingerprinted across 32 writing dimensions. Free research.
185x
price gap between models that write identically
178
models
12
clone pairs
32
dimensions
279 AI models invented the same fake scientist.
We read every word. 250 models. 2.14 million words. This is what we found.
