Nous: Hermes 4 405B

nousresearch/hermes-4-405b · Nous ResearchNot yet established

Declared family: Unknown
Evidence confidence: Unknown
Declared tokenizer tag: Other
Entered catalogue: 26 August 2025
Last tested: Not yet measured
Measurement: Awaiting measurement

Evidence stack

Signals of different kinds, weighed together

Signal	Result	Reference
Tokenizer signature	Not measured	–
API surface	Identical contract to 1 other entry	api_c75019be
Context and output	131,072 context · – max output	declared
Reasoning contract	Optional	declared
Serving providers observed	None recorded yet	–

Declared record

What the catalogue claims about this model

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...

Modalities: text->text
Declared tokenizer: Other
Prompt price: $1.00 / M tokens
Completion price: $3.00 / M tokens

Supported parameters

frequency_penaltyinclude_reasoningmax_tokenspresence_penaltyreasoningrepetition_penaltyresponse_formattemperaturetop_ktop_p

defaults: {}

Catalogue entry Weights on Hugging Face

History

Every observation, kept as taken

26 August 2025Enters the OpenRouter catalogue with no declared family.

Cite this page as the evidence record for Nous: Hermes 4 405B: the URL is stable, measurements are dated, and revisions append to the history above. Method: tokenizer fingerprinting, v1, 50 strings. The raw data behind every figure is on the data page.