Hermes 4 405B vs GPT-5.2-Codex
Detailed technical comparison between Hermes 4 405B (Nous Research) and GPT-5.2-Codex (OpenAI). Review live API token pricing, context window capabilities, time-to-first-token latency, and verified benchmark scores side-by-side.
Comparison Snapshot
GPT-5.2-Codex
400,000 tokensTie
Equal CapabilityTie
Equal SpeedHermes 4 405B
$1.00 / MTokHermes 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...
GPT-5.2-Codex
GPT-5.2-Codex is an upgraded version of GPT-5.1-Codex optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks....
Technical Specifications
🏆 = Superior Spec| Specification | Hermes 4 405B | GPT-5.2-Codex |
|---|---|---|
| Provider | Nous Research | OpenAI |
| Context Window | 131,072 tokens | 400,000 tokens🏆 |
| Agent Suitability | Not yet benchmarked | Not yet benchmarked |
| Time to First Token (TTFT) | No public TTFT data | No public TTFT data |
| Deployment Model | managed api | managed api |
| Production Stability | Stable GA (est.) | Stable GA (est.) |
| API Available | Yes | Yes |
| Released Date | 2025-08-26 | 2026-01-14 |
API Pricing Comparison
Input Price per Million Tokens
Hermes 4 405B
$1.00
GPT-5.2-Codex
$1.75
Output Price per Million Tokens
Hermes 4 405B
$3.00
GPT-5.2-Codex
$14.00
💡 Cost Ratio: Hermes 4 405B is 1.8x cheaper per input token than GPT-5.2-Codex.
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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.
Hermes 4 405B Quirks & Gotchas
No developer gotchas reported.
GPT-5.2-Codex Quirks & Gotchas
No developer gotchas reported.
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