Model comparison
GPT-5.4 Pro vs Hermes 4 405B
GPT-5.4 Pro has enough public results to be ranked (#16); Hermes 4 405B does not yet, so treat this comparison as directional.
Last verified . 0 shared benchmarks.
Summary
- The widest gap is in reasoning, where GPT-5.4 Pro leads 71.0 to 25.3.
- Hermes 4 405B is cheaper at $1 / $3 per million input/output tokens, against $30 / $180 for GPT-5.4 Pro.
- GPT-5.4 Pro accepts more context: 1.05M tokens versus 131K.
- Hermes 4 405B has downloadable open weights; the other is API-only.
Side by side
| GPT-5.4 Pro | Hermes 4 405B | |
|---|---|---|
| Provider | OpenAI | Nous Research |
| Noometry Index | 58.8 | 37.1 |
| Released | 2026-03-05 | — |
| Weights | Proprietary | Open |
| Context window | 1.05M | 131K |
| Max output | 128K | 118K |
| Input $ / M tokens | $30 | $1 |
| Output $ / M tokens | $180 | $3 |
| Results tracked | 16 | 2 |
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Category by category
Coding Not comparable
GPT-5.4 Pro: 42.6 (#89), Hermes 4 405B: —
| Benchmark | GPT-5.4 Pro | Hermes 4 405B |
|---|---|---|
| WeirdML | 57.4% | — |
Reasoning GPT-5.4 Pro leads
GPT-5.4 Pro: 71.0 (#10), Hermes 4 405B: 25.3
| Benchmark | GPT-5.4 Pro | Hermes 4 405B |
|---|---|---|
| ARC-AGI-2 | 83.3% | — |
| SimpleBench | 74.1% | — |
| Kagi LLM Benchmark | — | 55.8% |
| ARC-AGI-1 | 94.5% | — |
| CritPt | 30% | — |
| Chess Puzzles | 58.6% | — |
| EnigmaEval | 23.8% | — |
| Epoch Capabilities Index | 159.12 | — |
Math Not comparable
GPT-5.4 Pro: 72.0 (#17), Hermes 4 405B: —
| Benchmark | GPT-5.4 Pro | Hermes 4 405B |
|---|---|---|
| FrontierMath (Tiers 1-3) | 82.5% | — |
| FrontierMath Tier 4 | 58.5% | — |
| FrontierMath (Feb 2025 set) | 50% | — |
| FrontierMath Tier 4 (v1) | 37.5% | — |
Knowledge Not comparable
GPT-5.4 Pro: 68.3 (#6), Hermes 4 405B: —
| Benchmark | GPT-5.4 Pro | Hermes 4 405B |
|---|---|---|
| GPQA Diamond | 94.6% | — |
| Humanity's Last Exam | 44.3% | — |
| SimpleQA Verified | 46.3% | — |
| Vectara Hallucination Rate | 8.3% | — |
Writing & Preference Not comparable
GPT-5.4 Pro: —, Hermes 4 405B: 53.0
| Benchmark | GPT-5.4 Pro | Hermes 4 405B |
|---|---|---|
| EQ-Bench Creative Writing | — | 1421 |
Frequently asked questions
Is GPT-5.4 Pro better than Hermes 4 405B?
GPT-5.4 Pro has enough public results to be ranked (#16); Hermes 4 405B does not yet, so treat this comparison as directional.
Which is cheaper, GPT-5.4 Pro or Hermes 4 405B?
Hermes 4 405B is cheaper. It lists at $1 per million input tokens and $3 per million output tokens; GPT-5.4 Pro lists at $30 and $180.
Which has the bigger context window?
GPT-5.4 Pro does, with 1.05M tokens against 131K.
How many benchmarks do GPT-5.4 Pro and Hermes 4 405B share?
0 benchmarks have published results for both models. GPT-5.4 Pro has 16 scored results on Noometry and Hermes 4 405B has 2.