KAT-Coder-Pro V1 vs GPT-5.1-Codex: side-by-side summary

KAT-Coder-Pro V1 and GPT-5.1-Codex are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

KAT-Coder-Pro V1, from kwaipilot, has a 262,144-token context window and is priced by the provider serving it on OpenRouter.

GPT-5.1-Codex, from OpenAI, has a 400,000-token context window and is priced at $1.25/M tokens input, $10/M tokens output on OpenRouter.

Context window

• KAT-Coder-Pro V1: 262,144 tokens
• GPT-5.1-Codex: 400,000 tokens

Price

• KAT-Coder-Pro V1: Pricing varies by provider
• GPT-5.1-Codex: $1.25/M tokens input, $10/M tokens output

Provided by

• KAT-Coder-Pro V1: kwaipilot
• GPT-5.1-Codex: OpenAI

• KAT-Coder-Pro V1 model details, providers and pricing
• GPT-5.1-Codex model details, providers and pricing