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Hermes 4 405BOPEN
Hermes 4 405B (Nous Research): live API pricing, context window and the best open-source alternatives, tracked daily by OpenSourceAI.tech.
Prices update automatically — checked hourly against provider list prices.
Benchmarks & performance
Independent benchmark scores for Hermes 4 405B, measured by Artificial Analysis. Higher is better. Measurement mode: Reasoning.
About this model
Hermes 4 405B is an open-weight AI model by Nous Research. You can download and self-host it for free; the prices below are hosted-API list prices, tracked hourly, for when you prefer convenience over self-hosting.
Frequently asked questions
What is Hermes 4 405B?
Hermes 4 405B is an AI language model from Nous Research. It is open-weight: you can download it and run it on your own hardware, for free. It scores 9 on the Artificial Analysis intelligence index.
Is Hermes 4 405B free?
The weights are free and open — you can self-host Hermes 4 405B and pay nothing per token. If you prefer a hosted API, list prices are $1 per million input tokens and $3 per million output tokens.
What is Hermes 4 405B good at?
Independent benchmarks from Artificial Analysis give it GPQA 72.7%, MMLU-Pro 82.9%, Humanity's Last Exam 10.3%, Long Context Reasoning 20.7%, LiveCodeBench 68.6%, SciCode 25.2%, AIME 2025 69.7%, IFBench 32.7%, τ²-Bench 22.2%, Terminal-Bench Hard 11.4%. It is particularly used for mathematical reasoning.
How fast is Hermes 4 405B?
It generates about 37 tokens per second, with a median 0.74s delay before the first token. Measured independently by Artificial Analysis.
Can I self-host Hermes 4 405B?
Yes. Hermes 4 405B has open weights, so you can download it and run it on your own GPU or server with tools like Ollama, vLLM or llama.cpp — with no per-token cost.
Open-source alternatives
Depending on your workload, an open-weight model that you can self-host may cut costs dramatically or remove per-token pricing entirely. Our comparison pages put this model side by side with the strongest open-source contenders.