Compare · ModelsLive · 2 picked · head to head
Claude Mythos Preview vs GPT-5.4
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
Claude Mythos Preview wins on 2/2 benchmarks
Claude Mythos Preview wins 2 of 2 shared benchmarks. Leads in knowledge · coding.
Category leads
knowledge·Claude Mythos Previewcoding·Claude Mythos Preview
Hype vs Reality
Attention vs performance
Claude Mythos Preview
#2 by perf·#2 by attention
GPT-5.4
#44 by perf·no signal
Vendor risk
Who is behind the model
Anthropic
$380.0B·Tier 1
OpenAI
$840.0B·Tier 1
Head to head
2 benchmarks · 2 models
Claude Mythos PreviewGPT-5.4
GPQA diamond
Claude Mythos Preview leads by +3.4
Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs.
Claude Mythos Preview
94.5
GPT-5.4
91.1
SWE-Bench verified
Claude Mythos Preview leads by +17.0
Claude Mythos Preview
93.9
GPT-5.4
76.9
Full benchmark table
| Benchmark | Claude Mythos Preview | GPT-5.4 |
|---|---|---|
GPQA diamond Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs. | 94.5 | 91.1 |
SWE-Bench verified | 93.9 | 76.9 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| Claude Mythos Preview | — | — | 1.0M tokens (~500 books) | — |
| GPT-5.4 | $2.50 | $15.00 | 1.1M tokens (~525 books) | $56.25 |