Hermes 4 405B
Nous Research · released Aug 6, 2025 · NousResearch/Hermes-4-405B
- Type
- Open weightsLlama 3 Community License
- Params
- 406B
- Context
- 131K
about 98K words of context · download allowed, licence restricts use
Our take
Written Aug 3, 2026Hermes 4 is a 405.9-billion-parameter text model from Nous Research with a 131,072-token request limit. Its weights can be downloaded under a restricted community licence, and it is available from two hosts at matching rates with no price premium between them.
Pick this for large-context text work that needs a 131,072-token window, or when you want a very large downloadable model at a predictable rate across both tracked providers. Use it if 34 tokens per second on Nebius meets your latency needs. Skip it if you need measured quality scores, a fully permissive licence for commercial use, or verified speed on OpenRouter.
The case for it
- 405.9 billion parameters, placing it among the largest downloadable models.
- Identical pricing across both providers, so there is no premium for choosing one over the other.
- Throughput is measured at 34 tokens per second on Nebius.
The case against it
- No benchmark scores in our data — chat, reasoning, coding and other quality metrics are all unverified.
- Restricted licence: the Llama 3 Community Licence requires a separate Meta agreement for commercial use, unlike Apache 2.0 or fully permissive alternatives.
- Speed on OpenRouter is undisclosed in our data.
How good is it?
We hold no score for this model.
We look for every model we track on every board we watch, and none of them has turned up Hermes 4 405B — so there is no intelligence, coding, agentic or writing score to show you, not a low one, none.
Can you run it yourself?
- Fits in memory
- weights load entirely on the card
- Spills to system RAM
- some weights offload; much slower
- Too large
- will not load even with offload
- est
- size is calculated; the verdict could change by 10%
GeForce RTX 4090 · 24 GB
Too large for this card. The weights do not fit even with part of them offloaded to system memory.
Apple M1 Pro (16-core GPU) · 32 GB
Too large for this card. The weights do not fit even with part of them offloaded to system memory.
Comfortable fit
Apple M3 Ultra (80-core GPU) · 512 GB
Room to spare. 118.1 GB spare means a 10% error in the size would not change the answer.
Memory use by level
Against a 24 GB card.
All 3 sizes here are calculated, not measured. We hold no measured file for this model, so each size comes from the parameter count and every verdict above inherits that uncertainty.
Check against your own machine → · All 71 devices, with every size →
Or rent it from someone else
Cheapest of 2 live listings. Picked at the widest standard context we hold, within one quantisation slice, so the numbers beside it are a price one host actually charges.
- per 1M tokens
- $1.00 in / $3.00 out
- Context served
- 131K
- Throughput
- Not measured
| Provider | In / out per 1M tokens | Context | Throughput | Trains on prompts | Logs prompts | Zero retention |
|---|---|---|---|---|---|---|
| OpenRouter | $1.00 / $3.00 | 131K | not measured | Unknown | Unknown | Unknown |
| Nebius AI Studiofp8 | $1.00 / $3.00 | 131K | 29 tok/s | No | No | Confirmed |
Nebius AI StudioAcross the 2 listings we hold: 1 say they do not train on prompts, 0 say they do and 1 do not say. 1 appear in the zero-retention registry we check; the rest are unknown to us rather than confirmed either way.
What each host's API supports
From the parameter list each endpoint publishes. Streaming is omitted: nothing we hold reports it, for any model.
- ✓
- Supported
- ✗
- Not supported
- Not published
- host gave no parameter list
| Provider | Tool calling | JSON output | Strict schema |
|---|---|---|---|
| OpenRouter | ✗ | ✓ | ✗ |
| Nebius AI Studiofp8 | ✗ | ✓ | ✗ |
Tool calling: 0 of 2 listings say yes, 2 say no. JSON output: 2 of 2 listings say yes. Strict schema: 0 of 2 listings say yes, 2 say no.
Models people weigh against Hermes 4 405B
When we formed this view
Dates behind this page
Prices last checked 3d ago
What we do not know about this model yet
- We hold no measured file for it, so all 3 sizes on this page are calculated from the parameter count.
- No board we watch has turned up a score, so we hold no quality figures at all.
- Nothing we hold says whether an endpoint streams, so we do not show it either way.
- 1 of 2 listings do not say whether they train on prompts.
- We hold no cached-input rate for any of its listings.
Licence and identifiers
What the licence allowsLlama 3 Community License, what it allows commercially, and the identifiers you need to pull this model — its Hugging Face repo, our slug and a machine-readable card.
Licence
Llama 3 Community License
Commercial use allowed below 700M MAU; requires "Built with Meta Llama 3" attribution and Llama naming on derivatives.
Identifiers
- Hugging Face
- NousResearch/Hermes-4-405B
- Architecture
- Dense
- Modality record
- text->text
- Catalogue slug
- nousresearch-hermes-4-405b