Model comparison
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.
Last verified . 0 shared benchmarks.
Side by side
| Claude Mythos Preview | GPT-5.4 Pro | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 41.2 | 58.9 |
| Released | 2026-04-07 | 2026-03-05 |
| Weights | Proprietary | Proprietary |
| Context window | — | 1.05M |
| Max output | — | 128K |
| Input $ / M tokens | — | $30 |
| Output $ / M tokens | — | $180 |
| Results tracked | 2 | 16 |
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Category by category
Coding Not comparable
Claude Mythos Preview: —, GPT-5.4 Pro: 43.2 (#90)
| Benchmark | Claude Mythos Preview | GPT-5.4 Pro |
|---|---|---|
| WeirdML | — | 57.4% |
Agentic & Tool Use Not comparable
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 Not comparable
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 Not comparable
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 Not comparable
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% |
Frequently asked questions
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.