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GPT-5.1-Codex-Mini vs Hermes 3 405B Instruct

Detailed technical comparison between GPT-5.1-Codex-Mini (OpenAI) and Hermes 3 405B Instruct (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-5.1-Codex-Mini: 6 WinsvsHermes 3 405B Instruct: 0 Wins
Context Leader

GPT-5.1-Codex-Mini

400,000 tokens
Agentic Tool-Calling

Tie

Equal Capability
Lowest Latency (TTFT)

Tie

Equal Speed
Input Price Leader

GPT-5.1-Codex-Mini

$0.25 / MTok
OpenAIactive

GPT-5.1-Codex-Mini

GPT-5.1-Codex-Mini is a smaller and faster version of GPT-5.1-Codex

View GPT-5.1-Codex-Mini Full Specs →
Nous Researchactive

Hermes 3 405B Instruct

Hermes 3 is a generalist language model with many improvements over Hermes 2, including advanced agentic capabilities, much better roleplaying, reasoning, multi-turn conversation, long context coherence, and improvements across the...

View Hermes 3 405B Instruct Full Specs →

Technical Specifications

🏆 = Superior Spec
SpecificationGPT-5.1-Codex-MiniHermes 3 405B Instruct
ProviderOpenAINous Research
Context Window400,000 tokens🏆131,072 tokens
Agent SuitabilityN/AN/A
Time to First Token (TTFT)N/AN/A
Deployment Modelmanaged apiself hostable
Production Stabilitystablestable
API AvailableYesYes
Released Date2025-11-132024-08-16

API Pricing Comparison

Input Price per Million Tokens

GPT-5.1-Codex-Mini

$0.25

Hermes 3 405B Instruct

$1.00

Output Price per Million Tokens

GPT-5.1-Codex-Mini

$2.00

Hermes 3 405B Instruct

$1.00

💡 Cost Ratio: GPT-5.1-Codex-Mini is 4.0x cheaper per input token than Hermes 3 405B Instruct.

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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
92.4%vs78.8%+13.6% GPT-5.1-Codex-Mini
GPT-5.1-Codex-Mini 🏆
Hermes 3 405B Instruct
HumanEvalPython coding & logic synthesis
99.0%vs77.0%+22.0% GPT-5.1-Codex-Mini
GPT-5.1-Codex-Mini 🏆
Hermes 3 405B Instruct
MATHComplex mathematical problem solving
80.8%vs54.2%+26.6% GPT-5.1-Codex-Mini
GPT-5.1-Codex-Mini 🏆
Hermes 3 405B Instruct
GPQAGraduate-level expert reasoning
59.2%vs39.6%+19.6% GPT-5.1-Codex-Mini
GPT-5.1-Codex-Mini 🏆
Hermes 3 405B Instruct
HellaSwagCommonsense reasoning and inference
91.4%vs81.8%+9.6% GPT-5.1-Codex-Mini
GPT-5.1-Codex-Mini 🏆
Hermes 3 405B Instruct
MT-BenchMulti-turn conversation flow quality
9.4%vs8.4%+1.0% GPT-5.1-Codex-Mini
GPT-5.1-Codex-Mini 🏆
Hermes 3 405B Instruct

GPT-5.1-Codex-Mini Quirks & Gotchas

No developer gotchas reported.

Hermes 3 405B Instruct Quirks & Gotchas

No developer gotchas reported.

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