GPT-5.1-Codex vs Hermes 3 405B Instruct
Detailed technical comparison between GPT-5.1-Codex (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.
Comparison Snapshot
GPT-5.1-Codex
400,000 tokensTie
Equal CapabilityTie
Equal SpeedHermes 3 405B Instruct
$1.00 / MTokGPT-5.1-Codex
GPT-5.1-Codex is a specialized version of GPT-5.1 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks....
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...
Technical Specifications
🏆 = Superior Spec| Specification | GPT-5.1-Codex | Hermes 3 405B Instruct |
|---|---|---|
| Provider | OpenAI | Nous Research |
| Context Window | 400,000 tokens🏆 | 131,072 tokens |
| Agent Suitability | N/A | N/A |
| Time to First Token (TTFT) | N/A | N/A |
| Deployment Model | managed api | self hostable |
| Production Stability | stable | stable |
| API Available | Yes | Yes |
| Released Date | 2025-11-13 | 2024-08-16 |
API Pricing Comparison
Input Price per Million Tokens
GPT-5.1-Codex
$1.25
Hermes 3 405B Instruct
$1.00
Output Price per Million Tokens
GPT-5.1-Codex
$10.00
Hermes 3 405B Instruct
$1.00
💡 Cost Ratio: Hermes 3 405B Instruct is 1.3x cheaper per input token than GPT-5.1-Codex.
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.
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.
GPT-5.1-Codex Quirks & Gotchas
No developer gotchas reported.
Hermes 3 405B Instruct Quirks & Gotchas
No developer gotchas reported.
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