Hermes 4 405B
StandardNousResearch's flagship large-scale reasoning model based on Llama 4.
Top performance across complex reasoning, coding, and instruction following at 405B scale.
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Hermes 4 405B is somewhat expensive at $1.00/M tokens input and $3.00/M tokens output. The model supports extended reasoning, a 131K context window.
Benchmarks
This model hasn't been evaluated by Artificial Analysis yet. Benchmark scores will appear once they're published.
Specifications
Performance
Providers
Misc
Compare with
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Mistral Small 4vs Hermes 4 405BFrequently Asked Questions about Hermes 4 405B▼
When was Hermes 4 405B released?
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Hermes 4 405B was released on August 26, 2025.
Who created Hermes 4 405B?
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Hermes 4 405B was created by NousResearch.
How much does Hermes 4 405B cost?
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Hermes 4 405B costs $1.00/M input tokens and $3.00/M output tokens.
What is Hermes 4 405B API pricing?
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The Hermes 4 405B API is priced at $1.00 per million input tokens and $3.00 per million output tokens. You can access Hermes 4 405B through idapt.app alongside 200+ other AI models in one workspace.
Is Hermes 4 405B a reasoning model?
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Yes, Hermes 4 405B is a reasoning model. It can think step-by-step through complex problems before providing an answer, often yielding better results on difficult tasks like math, coding, and multi-step logic.
Does Hermes 4 405B support image or vision input?
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No, Hermes 4 405B does not currently support image or vision input. It is a text-only model.
Does Hermes 4 405B support audio?
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No, Hermes 4 405B does not support audio input.
What is the context window of Hermes 4 405B?
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Hermes 4 405B has a context window of 131K tokens, meaning it can process approximately 98,304 words of context at once.
Is Hermes 4 405B open source?
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Hermes 4 405B is a proprietary model developed by NousResearch. The model weights and training data are not publicly available.
Where can I use Hermes 4 405B?
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You can chat with Hermes 4 405B on idapt.app — no separate API key required. idapt is an AI workspace with 200+ models, agents, computers, and tasks. You can also access Hermes 4 405B through NousResearch's own API or platform.