Nous: Hermes 3 405B Instruct (free)

Nous: Hermes 3 405B Instruct (free) is a text-only model with a 128k-token context window, suitable for long-document work, extended conversations, and summarization tasks. It does not support tool calling, structured output, or built-in reasoning modes, so workflows that depend on function calling or guaranteed JSON formatting will need a different option. The clearest case for shortlisting this model is cost: it is entirely free, with no input or output charges. That makes it worth testing for high-volume or experimental use where paying per token is a constraint. The tradeoff is transparency; there is no independent benchmark coverage available, so its quality relative to other models in its class is unverified. Users who need proven, measurable performance before committing should treat it as unproven and run their own evaluations against their specific tasks before relying on it in production.