Nous: Hermes 4 405B API
About
Build advanced reasoning agents with Nous: Hermes 4 405B, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $1.00/1M input and $3.00/1M output tokens. Access Nous: Hermes 4 405B via the Kilo Gateway API with up to 118K output tokens.
Capabilities
Input Modalities
text
Output Modalities
text
Reasoning
Yes
Structured Output
No
Tool Use
No
WeightsClosed
Temperature
Adjustable
Attachment
Not Supported
Limits
Context Window
131K
Tokens
Input Limit
131K
Tokens
Max Output
118K
Tokens
Pricing
Standard (per 1M tokens)
Input
$1.00
Output
$3.00
Frequently Asked Questions
Nous: Hermes 4 405B by Kilo Gateway costs $1.00 per 1M input tokens and $3.00 per 1M output tokens.
Model Details
ID
nousresearch/hermes-4-405b
Provider
Kilo GatewayFamily
nousresearch
Release Date
Aug 26, 2025
Knowledge Cutoff
N/A
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
KILO_API_KEY
API Base URL
https://api.kilo.ai/api/gateway