Key Takeaways
Hermes 4 405B wins:
- Cheaper input tokens
- Cheaper output tokens
GPT-5 Codex wins:
- Larger context window
- Faster response time
- Higher intelligence benchmark
- Better at coding
- Better at math
- Supports vision
Price Advantage
Hermes 4 405B
Benchmark Advantage
GPT-5 Codex
Context Window
GPT-5 Codex
Speed
GPT-5 Codex
Pricing Comparison
Price Comparison
| Metric | Hermes 4 405B | GPT-5 Codex | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $1.00 | $1.25 | Hermes 4 405B |
| Output (per 1M tokens) | $3.00 | $10.00 | Hermes 4 405B |
| Cache Read (per 1M) | N/A | $125000.00 | GPT-5 Codex |
Using a 3:1 input/output ratio, Hermes 4 405B is 56% cheaper overall.
Hermes 4 405B Providers
Nebius $1.00 (Cheapest)
GPT-5 Codex Providers
OpenAI $1.25 (Cheapest)
Benchmark Comparison
6
Benchmarks Compared
0
Hermes 4 405B Wins
6
GPT-5 Codex Wins
Benchmark Scores
| Benchmark | Hermes 4 405B | GPT-5 Codex | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 17.1 | 44.5 | |
Coding Index Code generation & understanding | 18.1 | 38.9 | |
Math Index Mathematical reasoning | 15.3 | 98.7 | |
MMLU Pro Academic knowledge | 72.9 | 86.5 | |
GPQA Graduate-level science | 53.6 | 83.7 | |
LiveCodeBench Competitive programming | 54.6 | 84.0 |
GPT-5 Codex significantly outperforms in coding benchmarks.
Cost vs Quality
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Hermes 4 405B
Other models
Context & Performance
Context Window
Hermes 4 405B
131,072
tokens
GPT-5 Codex
400,000
tokens
Max output: 128,000 tokens
GPT-5 Codex has a 67% larger context window.
Speed Performance
| Metric | Hermes 4 405B | GPT-5 Codex | Winner |
|---|---|---|---|
| Tokens/second | 33.1 tok/s | 310.8 tok/s | |
| Time to First Token | 0.68s | 11.40s |
GPT-5 Codex responds 838% faster on average.
Capabilities
Feature Comparison
| Feature | Hermes 4 405B | GPT-5 Codex |
|---|---|---|
| Vision (Image Input) | ||
| Tool/Function Calls | ||
| Reasoning Mode | ||
| Audio Input | ||
| Audio Output | ||
| PDF Input | ||
| Prompt Caching | ||
| Web Search |
License & Release
| Property | Hermes 4 405B | GPT-5 Codex |
|---|---|---|
| License | Open Source | Proprietary |
| Author | Nousresearch | OpenAI |
| Released | Aug 2025 | Sep 2025 |
Hermes 4 405B Modalities
Input
text
Output
text
GPT-5 Codex Modalities
Input
textimage
Output
text