Nous Research · Released Aug 26, 2025Hermes 4 405B
Reasoning model for deliberate analysis, multi-step problem solving, and tool use.
- Capability
- —No ECI score yet
- Input
- $1.00per 1M tokens
- Output
- $3.00per 1M tokens
- Context
- 131K118K max output
What it costs
- Input
- $1.00per million tokens
- Output
- $3.00per million tokens
- Blended (3:1)
- $1.50pricier than 65% of priced models
Typical monthly bills
| Monthly usage | Estimated cost |
|---|---|
| Side project2M input + 0.5M output tokens | $3.50 |
| Team assistant25M input + 5M output tokens | $40.00 |
| Production app250M input + 50M output tokens | $400.00 |
Median of 5 paid API providers on models.dev.
Independent benchmarks
Epoch AI has not published a Capabilities Index score for Hermes 4 405B yet.
The details
- Lab
- Nous Research
- Released
- Aug 26, 2025
- Knowledge cutoff
- Aug 31, 2024
- Context window
- 131,072 tokens
- Max output
- 117,964 tokens
- Inputs
- Text
- Output
- Text
- Reasoning
- Always on
- Tool calling
- Yes
- Structured output
- No
- Weights
- Open weights
- Availability
- 5 API providerslisted on models.dev
More from Nous Research
About Hermes 4 405B
How much does Hermes 4 405B cost?
Hermes 4 405B costs $1.00 input / $3.00 output per million tokens (median across 5 API providers). At a 3:1 input-to-output mix that is $1.50 per million tokens, more expensive than 65% of the 445 priced models we track.
What is the context window of Hermes 4 405B?
Hermes 4 405B accepts up to 131,072 tokens per request and can write up to 117,964 tokens in one response.
How good is Hermes 4 405B?
Epoch AI has not published a Capabilities Index score for Hermes 4 405B yet.
Is Hermes 4 405B open source?
Yes. Nous Research publishes the weights, so it can be downloaded and self-hosted.
What inputs does Hermes 4 405B support?
Hermes 4 405B accepts text and replies in text. It is a reasoning model, supports tool calling.
When was Hermes 4 405B released?
Nous Research released Hermes 4 405B on Aug 26, 2025. Its training data runs to Aug 31, 2024.
What are the best alternatives to Hermes 4 405B?
The closest current models from other labs on capability, price and release date are Qwen3 VL 235B A22B Thinking (Alibaba (Qwen), $0.50 / $3.95), Apertus 70B (Swiss AI, $0.82 / $2.42), Relace Search (Relace, $1.00 / $3.00) and Kimi K2 Instruct 0905 (Moonshot AI, $0.60 / $2.50).