Hermes-4 405B
Model Information
| Slug | hermes-4-405b |
|---|---|
| LLM.txt | View |
| Release Date | August 26, 2025 |
Organization
| Name | Nebius |
|---|
Model Description
Hermes 4 is a large-scale reasoning model built on Meta-Llama-3.1-405B and released by Nous Research. It introduces a hybrid reasoning mode, where the model can choose to deliberate internally with <think>...</think> traces or respond directly, offering flexibility between speed and depth. Users can control the reasoning behaviour with the `reasoning` `enabled` boolean. [Learn more in our docs](https://openrouter.ai/docs/use-cases/reasoning-tokens#enable-reasoning-with-default-config)
The model is instruction-tuned with an expanded post-training corpus (~60B tokens) emphasizing reasoning traces, improving performance in math, code, STEM, and logical reasoning, while retaining broad assistant utility. It also supports structured outputs, including JSON mode, schema adherence, function calling, and tool use. Hermes 4 is trained for steerability, lower refusal rates, and alignment toward neutral, user-directed behavior.
The model is instruction-tuned with an expanded post-training corpus (~60B tokens) emphasizing reasoning traces, improving performance in math, code, STEM, and logical reasoning, while retaining broad assistant utility. It also supports structured outputs, including JSON mode, schema adherence, function calling, and tool use. Hermes 4 is trained for steerability, lower refusal rates, and alignment toward neutral, user-directed behavior.
Available at 12 Providers
| Provider | Type | Model Name | Original Model | Input ($/1M) | Output ($/1M) | Free | Actions | |
|---|---|---|---|---|---|---|---|---|
|
OpenRouter |
Chat
Code
|
Hermes 4 405B
|
nousresearch/hermes-4-405b
|
$1.00 | $3.00 | ||
|
Nebius Token Factory |
Hermes-4-405B
|
NousResearch/Hermes-4-405B
|
$1.00 | $3.00 | |||
|
Kilo Code |
Code
|
Nous: Hermes 4 405B
|
nousresearch/hermes-4-405b
|
$1.00 | $3.00 | ||
|
WaveSpeed AI |
Chat
Code
|
hermes-4-405b
|
nousresearch/hermes-4-405b
|
$1.10 | $3.30 | ||
|
AIMLAPI |
Nous: Hermes 4 405B
|
nousresearch/hermes-4-405b
|
- | - | |||
|
Nano-GPT |
Hermes 4 Large (Thinking)
|
nousresearch/hermes-4-405b:thinking
|
- | - | |||
|
|
Nano-GPT |
Hermes 4 Large
|
nousresearch/hermes-4-405b
|
- | - | |||
|
Yupp |
Chat
|
Hermes 4 405B Reasoning FP8 (OpenRouter)
|
nousresearch/hermes-4-405b
|
- | - | ||
|
LangDB |
hermes-4-405b
|
hermes-4-405b
|
- | - | |||
|
Blackbox AI |
Code
|
blackboxai/nousresearch/hermes-4-405b
|
blackboxai/nousresearch/hermes-4-405b
|
- | - | ||
|
Airforce API |
hermes-4-405b
|
hermes-4-405b
|
- | - | |||
|
Writingmate |
Chat
Code
|
Nous: Hermes 4 405B
|
nousresearch/hermes-4-405b
|
- | - |