Hermes 4 405B vs GPT-5 Chat: side-by-side summary

Hermes 4 405B and GPT-5 Chat 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 Chat, from OpenAI, has a 128,000-token context window and is priced by the provider serving it on OpenRouter.

Context window

• Hermes 4 405B: 131,072 tokens
• GPT-5 Chat: 128,000 tokens

Price

• Hermes 4 405B: $1/M tokens input, $3/M tokens output
• GPT-5 Chat: Pricing varies by provider

Provided by

• Hermes 4 405B: Nous Research
• GPT-5 Chat: OpenAI

• Hermes 4 405B model details, providers and pricing
• GPT-5 Chat model details, providers and pricing