Nous Research: Hermes 4 405B

Public pricingIntelligence 79/100Medium memoryDeep thinkingTool use

Nous: Hermes 4 405B is a text model for reasoning and problem solving. It combines deep reasoning and planning with a 131K tokens context window and a balanced-cost profile. Use it for reasoning, analysis, and hard problem solving when quality, speed, and cost matters. It is a practical choice for teams that need reliable output, flexible deployment, and room to scale.

Input

$1.00/1M

Output

$3.00/1M

Cached

$0.05/1M

Batch

$0.25/1M

Calculate your Hermes 4 405B bill.

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What would Hermes 4 405B cost you?

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Technical specifications

Hermes 4 405B at a glance.

Memory

131,072

tokens

Max reply

32,768

tokens

Memory tier

Medium

a long report or a codebase file

Tokenizer

—

Released

Aug 2025

Training cutoff

Dec 2024

Availability

Public pricing

Status

active

What it can do

Capabilities & limits.

  • Understands images
  • Deep step-by-step thinking
  • Uses tools / calls functions
  • Strict JSON output
  • Streams replies
  • Fine-tunable on your data

When to pick Hermes 4 405B

  • Multi-step reasoning, research agents, or hard math.
  • Agentic workflows that call tools or APIs.

When to look elsewhere

  • Your workload involves images — pick a vision-capable model instead.

Alternatives

Similar models to compare.

FAQ

Hermes 4 405B — the questions we see most.

Pricing, capabilities, alternatives — generated from the same data that powers the calculator above.

Get instant answers from our AI agent

At a typical workload of 50,000 conversations a month with 1,500-token prompts and 800-token replies, Hermes 4 405B costs roughly $195 per month. Input is $1.00 /1M tokens and output is $3.00 /1M tokens.
Hermes 4 405B has a 131,072-token context window (medium memory — a long report or a codebase file). That means you can fit about 24,576 words of input and history in a single call.
Beyond text generation, Hermes 4 405B supports deep step-by-step reasoning, calling functions / tools, strict JSON output, fine-tuning on your own data. It streams replies by default.
Hermes 4 405B was released in August 2025, with training data cut off around December 2024.
Models in a similar class include Hermes 4 70B, Claude Haiku 4.5, MiMo-V2-Pro. The "Similar models" section below this FAQ links into each.

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