Kimi K2 Thinking vs GPT-5.1-Codex-Mini: side-by-side summary

Kimi K2 Thinking and GPT-5.1-Codex-Mini are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

Kimi K2 Thinking, from moonshotai, has a 262,144-token context window and is priced at $0.60/M tokens input, $2.50/M tokens output on OpenRouter.

GPT-5.1-Codex-Mini, from OpenAI, has a 400,000-token context window and is priced at $0.25/M tokens input, $2/M tokens output on OpenRouter.

Context window

• Kimi K2 Thinking: 262,144 tokens
• GPT-5.1-Codex-Mini: 400,000 tokens

Price

• Kimi K2 Thinking: $0.60/M tokens input, $2.50/M tokens output
• GPT-5.1-Codex-Mini: $0.25/M tokens input, $2/M tokens output

Provided by

• Kimi K2 Thinking: moonshotai
• GPT-5.1-Codex-Mini: OpenAI

• Kimi K2 Thinking model details, providers and pricing
• GPT-5.1-Codex-Mini model details, providers and pricing