# Claude Mythos Preview vs GPT-5.4 Pro

> GPT-5.4 Pro has enough public results to be ranked (#18); Claude Mythos Preview does not yet, so treat this comparison as directional.

- Canonical page: https://noometry.com/compare/claude-mythos-preview-vs-gpt-5-4-pro
- Last updated: 2026-10-12
- Shared benchmarks: 0

## Snapshot

| | Claude Mythos Preview | GPT-5.4 Pro |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 41.2 | 58.9 |
| Rank | — | 18 |
| Context | — | 1.05M |
| Input $/M | — | $30 |
| Output $/M | — | $180 |
| Weights | Proprietary | Proprietary |

## Coding

- Claude Mythos Preview: —
- GPT-5.4 Pro: 43.2 (#90)

| Benchmark | Claude Mythos Preview | GPT-5.4 Pro |
|---|---|---|
| WeirdML | — | 57.4% |

## Agentic & Tool Use

- Claude Mythos Preview: 41.4
- GPT-5.4 Pro: —

| Benchmark | Claude Mythos Preview | GPT-5.4 Pro |
|---|---|---|
| ExploitBench | 73.8% | — |
| METR Time Horizons | 85.2% | — |

## Reasoning

- Claude Mythos Preview: —
- GPT-5.4 Pro: 70.7 (#13)

| Benchmark | Claude Mythos Preview | GPT-5.4 Pro |
|---|---|---|
| ARC-AGI-2 | — | 83.3% |
| SimpleBench | — | 74.1% |
| ARC-AGI-1 | — | 94.5% |
| CritPt | — | 30% |
| Chess Puzzles | — | 58.6% |
| EnigmaEval | — | 23.8% |
| Epoch Capabilities Index | — | 158.93 |

## Math

- Claude Mythos Preview: —
- GPT-5.4 Pro: 72.4 (#22)

| Benchmark | Claude Mythos Preview | GPT-5.4 Pro |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 82.5% |
| FrontierMath Tier 4 | — | 58.5% |
| FrontierMath (Feb 2025 set) | — | 50% |
| FrontierMath Tier 4 (v1) | — | 37.5% |

## Knowledge

- Claude Mythos Preview: —
- GPT-5.4 Pro: 68.3 (#7)

| Benchmark | Claude Mythos Preview | GPT-5.4 Pro |
|---|---|---|
| GPQA Diamond | — | 94.6% |
| Humanity's Last Exam | — | 44.3% |
| SimpleQA Verified | — | 46.3% |
| Vectara Hallucination Rate | — | 8.3% |

## FAQ

### Is Claude Mythos Preview better than GPT-5.4 Pro?

GPT-5.4 Pro has enough public results to be ranked (#18); Claude Mythos Preview does not yet, so treat this comparison as directional.

### How many benchmarks do Claude Mythos Preview and GPT-5.4 Pro share?

0 benchmarks have published results for both models. Claude Mythos Preview has 2 scored results on Noometry and GPT-5.4 Pro has 16.