How accurate is Hermes 4 405B?

Hermes 4 405B answered 21 of 80 questions correctly (26.2%) in our 2026-10-27 run, ranking #67 of 78 models.

How fast is Hermes 4 405B?

Hermes 4 405B generated a median of 41 output tokens per second in our 2026-10-27 run, ranking #65 of 78. Median time to first token was 0.3 s.

What is the latency of Hermes 4 405B?

Hermes 4 405B had a median time to first token of 0.3 s in our 2026-10-27 run, ranking #3 of 78 models.

How much does Hermes 4 405B cost?

Hermes 4 405B cost $0.01 per question on average as billed in our 2026-10-27 run, reasoning tokens included.

What is Hermes 4 405B API pricing?

Hermes 4 405B is listed at $1 per million input tokens and $3 per million output tokens on OpenRouter.

What is the context window of Hermes 4 405B?

Hermes 4 405B accepts up to 131,072 tokens of context, according to OpenRouter's model catalogue.

Is Hermes 4 405B open source?

Yes. Hermes 4 405B is an open-weights model: Nous publishes the weights, so you can run it yourself as well as through an API.

Who makes Hermes 4 405B?

Hermes 4 405B is made by Nous. We tested it through OpenRouter using the model ID nousresearch/hermes-4-405b.

Where can I use Hermes 4 405B via API?

Through OpenRouter, Hermes 4 405B is served by 1 host: Nebius.

NousOpen weightsReleased 26 Aug 2025

Hermes 4 405B benchmarks, speed and API pricing

Reviewed by LLM Verifications team · Tested 27 Oct 2026

Compare

Available through OpenRouter on

Nebius$1 in · $3 out

Intelligence26.2% correct#67 of 72

Speed41tok/s#65 of 72

Cost$0.01per question#58 of 72List $1 in · $3 out per 1M

Verbosity3,223tokens per question#65 of 72

Summary

Answers 21 of 80 verification questions correctly (26.2%), placing #67 of 72 models tested on the current suite.
Generates 41 output tokens per second, faster than 10% of the models we measure.
Starts responding after 0.3 s (median time to first token), including thinking time.
Costs $0.01 per question as billed, #17 cheapest of 31 models priced over $1 per 1M tokens.

Specifications

Reasoning: Yes
Input: text
Output: text
Context window: 131k tokens
Weights: Open weights
Knowledge cutoff: 31 Aug 2024
OpenRouter ID: nousresearch/hermes-4-405b
Last tested: 27 Oct 2026

Peer group: 34 models with a blended list price over $1 per 1M tokens (3 input : 1 output). Charts below compare Hermes 4 405B with all models; cost and speed charts focus on this peer group.

Intelligence

Verification score: the share of 80 questions from open datasets answered correctly. See the benchmark datasets.

Score vs. cost per question

Hermes 4 405B circled; dashed line joins models no cheaper model beats

Score vs. end-to-end response time

Hermes 4 405B circled · accurate and quick sits top left

Score vs. tokens per question

Hermes 4 405B circled · output tokens, reasoning included

Verification score

All models tested on the current suite

61 more models · see the full leaderboard

Cost

Average cost of one question, split into input, reasoning and answer tokens at each model's list price. Reasoning tokens are billed as output.

Cost per question, by token type

Peer group: blended price over $1

Input Reasoning Answer

Cost per question, as billed

All models · lower is better

1Granite 4.0 Micro$0.000051
2gpt-oss-20b$0.000066
3Granite 4.2 8B$0.000077
4Nova Micro 1.0$0.000087
5Mercury 2.5$0.00011
6Phi 4$0.00012
7gpt-oss-120b$0.00013
8GLM 5.3 Flash$0.00015
9Ministral 3 3B 2512$0.00019
10GPT-6 Luna$0.00025
58Hermes 4 405B$0.01

61 more models · see the full leaderboard

Speed and latency

Median of 3 streamed runs of the same prompt, measured 25 Oct 2026.

Output speed

Peer group (over $1) · higher is better

18 more models · see the full leaderboard

Time to first token

Peer group (over $1) · lower is better

21 more models · see the full leaderboard

End-to-end response time

Peer group (over $1) · lower is better

20 more models · see the full leaderboard

Latency vs. output speed

Hermes 4 405B circled · quick to start and fast sits top left

Results by category

Questions answered correctly in each category

Science5/30

Engineering0/15

Medicine3/11

Economics5/9

Law2/6

Humanities & social science6/9

Compare Hermes 4 405B

Head to head with its closest rivals, other Nous models and the top models overall.

Hosts and prices

Every host serving this model through OpenRouter, from OpenRouter's catalogue

Host	Input / 1M	Output / 1M	Context	Max output	Quantization
Nebius	$1	$3	131k	118k	fp8

Sources

Scores, speed and billed cost are our own measurements. Prices, context window and hosts come from OpenRouter's catalogue on the test date.

Hermes 4 405B on OpenRouter: list prices and hosts
Model card on Hugging Face: weights and licence
SuperGPQA (paper): 50 of the questions, ODC-BY 1.0
MMLU-Pro (paper): 30 of the questions, MIT
OpenRouter generation records: where billed cost and native token counts come from
Our methodology and editorial standards

Hermes 4 405B: frequently asked questions

How accurate is Hermes 4 405B?: Hermes 4 405B answered 21 of 80 questions correctly (26.2%) in our 2026-10-27 run, ranking #67 of 78 models.
How fast is Hermes 4 405B?: Hermes 4 405B generated a median of 41 output tokens per second in our 2026-10-27 run, ranking #65 of 78. Median time to first token was 0.3 s.
What is the latency of Hermes 4 405B?: Hermes 4 405B had a median time to first token of 0.3 s in our 2026-10-27 run, ranking #3 of 78 models.
How much does Hermes 4 405B cost?: Hermes 4 405B cost $0.01 per question on average as billed in our 2026-10-27 run, reasoning tokens included.
What is Hermes 4 405B API pricing?: Hermes 4 405B is listed at $1 per million input tokens and $3 per million output tokens on OpenRouter.
What is the context window of Hermes 4 405B?: Hermes 4 405B accepts up to 131,072 tokens of context, according to OpenRouter's model catalogue.
Is Hermes 4 405B open source?: Yes. Hermes 4 405B is an open-weights model: Nous publishes the weights, so you can run it yourself as well as through an API.
Who makes Hermes 4 405B?: Hermes 4 405B is made by Nous. We tested it through OpenRouter using the model ID nousresearch/hermes-4-405b.
Where can I use Hermes 4 405B via API?: Through OpenRouter, Hermes 4 405B is served by 1 host: Nebius.

NousOpen weightsReleased 26 Aug 2025

Hermes 4 405B benchmarks, speed and API pricing

Reviewed by LLM Verifications team · Tested 27 Oct 2026

Compare

Available through OpenRouter on

Nebius$1 in · $3 out

Intelligence26.2% correct#67 of 72

Speed41tok/s#65 of 72

Cost$0.01per question#58 of 72List $1 in · $3 out per 1M

Verbosity3,223tokens per question#65 of 72

Summary

Answers 21 of 80 verification questions correctly (26.2%), placing #67 of 72 models tested on the current suite.
Generates 41 output tokens per second, faster than 10% of the models we measure.
Starts responding after 0.3 s (median time to first token), including thinking time.
Costs $0.01 per question as billed, #17 cheapest of 31 models priced over $1 per 1M tokens.

Specifications

Reasoning: Yes
Input: text
Output: text
Context window: 131k tokens
Weights: Open weights
Knowledge cutoff: 31 Aug 2024
OpenRouter ID: nousresearch/hermes-4-405b
Last tested: 27 Oct 2026

Peer group: 34 models with a blended list price over $1 per 1M tokens (3 input : 1 output). Charts below compare Hermes 4 405B with all models; cost and speed charts focus on this peer group.

Intelligence

Verification score: the share of 80 questions from open datasets answered correctly. See the benchmark datasets.

Score vs. cost per question

Hermes 4 405B circled; dashed line joins models no cheaper model beats

Score vs. end-to-end response time

Hermes 4 405B circled · accurate and quick sits top left

Score vs. tokens per question

Hermes 4 405B circled · output tokens, reasoning included

Verification score

All models tested on the current suite

61 more models · see the full leaderboard

Cost

Average cost of one question, split into input, reasoning and answer tokens at each model's list price. Reasoning tokens are billed as output.

Cost per question, by token type

Peer group: blended price over $1

Input Reasoning Answer

Cost per question, as billed

All models · lower is better

1Granite 4.0 Micro$0.000051
2gpt-oss-20b$0.000066
3Granite 4.2 8B$0.000077
4Nova Micro 1.0$0.000087
5Mercury 2.5$0.00011
6Phi 4$0.00012
7gpt-oss-120b$0.00013
8GLM 5.3 Flash$0.00015
9Ministral 3 3B 2512$0.00019
10GPT-6 Luna$0.00025
58Hermes 4 405B$0.01

61 more models · see the full leaderboard

Speed and latency

Median of 3 streamed runs of the same prompt, measured 25 Oct 2026.

Output speed

Peer group (over $1) · higher is better

18 more models · see the full leaderboard

Time to first token

Peer group (over $1) · lower is better

21 more models · see the full leaderboard

End-to-end response time

Peer group (over $1) · lower is better

20 more models · see the full leaderboard

Latency vs. output speed

Hermes 4 405B circled · quick to start and fast sits top left

Results by category

Questions answered correctly in each category

Science5/30

Engineering0/15

Medicine3/11

Economics5/9

Law2/6

Humanities & social science6/9

Compare Hermes 4 405B

Head to head with its closest rivals, other Nous models and the top models overall.

Hosts and prices

Every host serving this model through OpenRouter, from OpenRouter's catalogue

Host	Input / 1M	Output / 1M	Context	Max output	Quantization
Nebius	$1	$3	131k	118k	fp8

Sources

Scores, speed and billed cost are our own measurements. Prices, context window and hosts come from OpenRouter's catalogue on the test date.

Hermes 4 405B on OpenRouter: list prices and hosts
Model card on Hugging Face: weights and licence
SuperGPQA (paper): 50 of the questions, ODC-BY 1.0
MMLU-Pro (paper): 30 of the questions, MIT
OpenRouter generation records: where billed cost and native token counts come from
Our methodology and editorial standards

Hermes 4 405B: frequently asked questions

How accurate is Hermes 4 405B?: Hermes 4 405B answered 21 of 80 questions correctly (26.2%) in our 2026-10-27 run, ranking #67 of 78 models.
How fast is Hermes 4 405B?: Hermes 4 405B generated a median of 41 output tokens per second in our 2026-10-27 run, ranking #65 of 78. Median time to first token was 0.3 s.
What is the latency of Hermes 4 405B?: Hermes 4 405B had a median time to first token of 0.3 s in our 2026-10-27 run, ranking #3 of 78 models.
How much does Hermes 4 405B cost?: Hermes 4 405B cost $0.01 per question on average as billed in our 2026-10-27 run, reasoning tokens included.
What is Hermes 4 405B API pricing?: Hermes 4 405B is listed at $1 per million input tokens and $3 per million output tokens on OpenRouter.
What is the context window of Hermes 4 405B?: Hermes 4 405B accepts up to 131,072 tokens of context, according to OpenRouter's model catalogue.
Is Hermes 4 405B open source?: Yes. Hermes 4 405B is an open-weights model: Nous publishes the weights, so you can run it yourself as well as through an API.
Who makes Hermes 4 405B?: Hermes 4 405B is made by Nous. We tested it through OpenRouter using the model ID nousresearch/hermes-4-405b.
Where can I use Hermes 4 405B via API?: Through OpenRouter, Hermes 4 405B is served by 1 host: Nebius.