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GPT-4o-mini vs Hermes 4 405B

Detailed technical comparison between GPT-4o-mini (OpenAI) and Hermes 4 405B (Nous Research). Review live API token pricing, context window capabilities, time-to-first-token latency, and verified benchmark scores side-by-side.

⚡ Executive Summary & Verdict

Comparison Snapshot

GPT-4o-mini: 6 WinsvsHermes 4 405B: 0 Wins
Context Leader

Hermes 4 405B

131,072 tokens
Agentic Tool-Calling

Tie

Equal Capability
Lowest Latency (TTFT)

Tie

Equal Speed
Input Price Leader

GPT-4o-mini

$0.15 / MTok
OpenAIactive

GPT-4o-mini

GPT-4o mini is OpenAI's newest model after [GPT-4 Omni](/models/openai/gpt-4o), supporting both text and image inputs with text outputs. As their most advanced small model, it is many multiples more affordable...

View GPT-4o-mini Full Specs →
Nous Researchactive

Hermes 4 405B

Hermes 4 is a large-scale reasoning model built on Meta-Llama-3.1-405B and released by Nous Research. It introduces a hybrid reasoning mode, where the model can choose to deliberate internally with...

View Hermes 4 405B Full Specs →

Technical Specifications

🏆 = Superior Spec
SpecificationGPT-4o-miniHermes 4 405B
ProviderOpenAINous Research
Context Window128,000 tokens131,072 tokens🏆
Agent Suitability82/100N/A
Time to First Token (TTFT)150 msN/A
Deployment Modelmanaged apimanaged api
Production Stabilitystablestable
API AvailableYesYes
Released Date2024-07-182025-08-26

API Pricing Comparison

Input Price per Million Tokens

GPT-4o-mini

$0.15

Hermes 4 405B

$1.00

Output Price per Million Tokens

GPT-4o-mini

$0.60

Hermes 4 405B

$3.00

💡 Cost Ratio: GPT-4o-mini is 6.7x cheaper per input token than Hermes 4 405B.

Want to test both models live?

Run side-by-side prompt benchmarks in our dynamic multi-model Sandbox. Compare execution speeds, latency metrics, and compute actual costs in real-time.

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Benchmark Performance Metrics

Standardized Scores (0–100%)

Scores show verified raw accuracy percentages across standardized AI evaluation suites. Higher bars indicate superior performance in that domain.

MMLUGeneral knowledge & multi-task understanding
82.0%vs78.6%+3.4% GPT-4o-mini
GPT-4o-mini 🏆
Hermes 4 405B
HumanEvalPython coding & logic synthesis
84.0%vs76.8%+7.2% GPT-4o-mini
GPT-4o-mini 🏆
Hermes 4 405B
MATHComplex mathematical problem solving
70.2%vs54.0%+16.2% GPT-4o-mini
GPT-4o-mini 🏆
Hermes 4 405B
GPQAGraduate-level expert reasoning
45.0%vs39.4%+5.6% GPT-4o-mini
GPT-4o-mini 🏆
Hermes 4 405B
HellaSwagCommonsense reasoning and inference
84.7%vs81.6%+3.1% GPT-4o-mini
GPT-4o-mini 🏆
Hermes 4 405B
MT-BenchMulti-turn conversation flow quality
8.6%vs8.4%+0.2% GPT-4o-mini
GPT-4o-mini 🏆
Hermes 4 405B

GPT-4o-mini Quirks & Gotchas

  • ▸Ultra-low latency — best TTFT in the OpenAI lineup
  • ▸Tool calling limited to single-step — not suitable for complex agentic pipelines

Hermes 4 405B Quirks & Gotchas

No developer gotchas reported.

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