Compare Hermes 4 405B from Nous Research and GPT-5 Codex from OpenAI on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the OpenRouter API.
Hermes 4 405B and GPT-5 Codex are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
Hermes 4 405B, from Nous Research, has a 131,072-token context window and is priced at $1/M tokens input, $3/M tokens output on OpenRouter.
GPT-5 Codex, from OpenAI, has a 400,000-token context window and is priced by the provider serving it on OpenRouter.