// Nous Research
Hermes 4 405B
A Nous Research model. 1 prices across 1 channels side by side, each with its source and check date – plus specs, licence, speed and benchmarks.
- Official in/out per 1M
- —
- Lowest (Nebius)
- $1 / $3
- Context
- 131K
- Prices listed
- 1
Prices checked 2026-10-22Official sources linked on every rowNo estimatesCheapest LLM APIs →
01Specs at a glance
Official values first; gaps filled from OpenRouter’s API where the vendor page is silent.
| Vendor | Nous Research |
|---|---|
| Context window | 131K (131,072 tokens) |
| Max output | 118K |
| Input | Text |
| Output | Text |
| Tool calling / JSON | No / Yes |
| Weights & licence | Open weights · llama3 · Hugging Face |
| Parameters | 406B (from weight files) |
| Released | Aug 26, 2025 |
| Model IDs | nousresearch/hermes-4-405b |
02Prices on 1 channels
Per 1M tokens, in the currency each source publishes (1 USD = 6.7 CNY for the blended column). Sorted: official first, then cheapest.
| Channel | Source | Input | Output | Cache hit | Blended $ | Context | Notes |
|---|---|---|---|---|---|---|---|
| Nebius · fp8 Via OpenRouter / provider listed there | OpenRouter 10-22 | $1 | $3 | — | 1.5 | 131K | Nebius price as listed on OpenRouter (pass-through; quantization=fp8; discount field=0); not checked against Nebius's own page |
“Official” = vendor pricing page; “Platform” = the platform’s own pricing page; “OpenRouter” = price listed on OpenRouter, not checked on the platform’s site. Click a source tag to open the original page.
03Where you can use it
Derived only from the price sources above. Country restrictions are set by each vendor – check their terms before you sign up.
- Via OpenRouter / provider listed there
Nebius - Self-host the open weights
GPU / VRAM sizing and build plans→
04Performance
Speed and AA index from Artificial Analysis public leaderboards (not our own tests); benchmark scores from our benchmark library, best result per benchmark.
05Price changes we recorded
All price changes →From our daily re-checks of the sources above.
No price change recorded since we started tracking (2026-10-10).
06More from Nous Research
FAQ
How much does the Hermes 4 405B API cost?
There is no official pay-as-you-go price in our data. The lowest listed price is $1 / $3 on Nebius.
What is the context window of Hermes 4 405B?
131K tokens of context, up to 118K output tokens. Platforms may cap it lower – see the table.
Is Hermes 4 405B open source?
Yes, the weights are published on Hugging Face (NousResearch/Hermes-4-405B). Licence: llama3.