Nous: Hermes 4 405B

405B

Hermes 4 is a large-scale reasoning model built on Meta-Llama-3.1-405B and released by Nous Research.

Context
131K
Max output
118K
Input price
$1/1M tokens
Output price
$3/1M tokens

Capabilities

Reasoning & Interaction
Reasoning
Output Control
Structured Output
JSON Mode

Details

Model IDnousresearch/hermes-4-405b
Provider OpenRouter
Creator nousresearch
Family—
License—
Status—
Typechat
Input modalitiestext
Output modalitiestext
Open weight—
Parameters405B
Architecture—
Context window131K tokens
Max input—
Max output118K tokens
Reasoning tokens—
Knowledge cutoff—
Release date
Sourceofficial

Pricing

Input
$1
Output
$3
Cache write
—
Cache read
$0.2
Batch in
—
Batch out
—

API

GET/v1/models/openrouter/nousresearch/hermes-4-405b

Nous: Hermes 4 405B

nousresearch/hermes-4-405b

Hermes 4 is a large-scale reasoning model built on Meta-Llama-3.1-405B and released by Nous Research.

Changes · 6 entries
nousresearch/hermes-4-405bupdateca7a400Nov 2, 2026, 03:02 AM
pricingcached input$0.2
max_output_tokens117964
nousresearch/hermes-4-405bupdateb2f45bfOct 29, 2026, 03:29 AM
pricingcached input$0.2
nousresearch/hermes-4-405bupdatee3d7dedAug 31, 2026, 04:13 AM
max_output_tokens117964
nousresearch/hermes-4-405bupdate1cd659eMar 24, 2026, 04:19 AM
capabilitiesjson modeyes
nousresearch/hermes-4-405bupdate2b100acMar 23, 2026, 05:30 AM
model_typechat
parameters405
release_date2025-08-26
taglineHermes 4 is a large-scale reasoning model built on Meta-L...
nousresearch/hermes-4-405bcreate7f5c66fMar 21, 2026, 05:16 AM