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.
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GPT 6 Astravs Hermes 4 405BGPT 6.1 Sol Provs Hermes 4 405BGPT 6.1 Solvs Hermes 4 405BGPT 6 Lunavs Hermes 4 405B
Claude Fable 5.1vs Hermes 4 405BClaude Opus 5.5vs Hermes 4 405BClaude Sonnet 5.5vs Hermes 4 405B
Gemini 3.8 Flashvs Hermes 4 405BGemini 4 Argonvs Hermes 4 405BGemma 4 31Bvs Hermes 4 405B
Grok 4.7vs Hermes 4 405BGrok Build 0.1vs Hermes 4 405B
Muse Spark Openvs Hermes 4 405BMuse Wondervs Hermes 4 405B
DeepSeek V4 Pro (0813)vs Hermes 4 405BDeepSeek V4.1 Flash 1017vs Hermes 4 405B
MiniMax M3vs Hermes 4 405B
Kimi K3vs Hermes 4 405BKimi K2.7 Codevs Hermes 4 405B
GLM 5.3vs Hermes 4 405BGLM 5.3 Flashvs Hermes 4 405B
Qwen3.8 Max (0902)vs Hermes 4 405BQwen3 Coder Nextvs Hermes 4 405B
Nemotron 3 Ultravs Hermes 4 405BNemotron 3.5 Super VLvs 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.