Compare GPT-5 Codex from OpenAI and R1T Chimera from tngtech on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the OpenRouter API.
GPT-5 Codex and R1T Chimera are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
GPT-5 Codex, from OpenAI, has a 400,000-token context window and is priced by the provider serving it on OpenRouter.
R1T Chimera, from tngtech, has a 163,840-token context window and is priced by the provider serving it on OpenRouter.