Compare · ModelsLive · 2 picked · head to head
Claude Mythos Preview vs GPT-5.4 Pro
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
Claude Mythos Preview wins on 1/1 benchmarks
Claude Mythos Preview wins 1 of 1 shared benchmarks. Leads in knowledge.
Category leads
knowledge·Claude Mythos Preview
Hype vs Reality
Attention vs performance
Claude Mythos Preview
#2 by perf·#2 by attention
GPT-5.4 Pro
#24 by perf·no signal
Vendor risk
Who is behind the model
Anthropic
$380.0B·Tier 1
OpenAI
$840.0B·Tier 1
Head to head
1 benchmark · 2 models
Claude Mythos PreviewGPT-5.4 Pro
GPQA diamond
Claude Mythos Preview leads by +1.7
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 Pro
92.8
Full benchmark table
| Benchmark | Claude Mythos Preview | GPT-5.4 Pro |
|---|---|---|
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 | 92.8 |
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 Pro | $30.00 | $180.00 | 1.1M tokens (~525 books) | $675.00 |
People also compared
Claude Mythos Preview vs Claude Opus 4.6Claude Mythos Preview vs GPT-5.4Claude Mythos Preview vs Gemini 3.1 Pro PreviewClaude Mythos Preview vs o3 ProGemini 3.1 Pro Preview vs GPT-5.4 ProClaude Mythos Preview vs GPT-5 ChatClaude Mythos Preview vs Qwen3.5 397B A17BClaude Mythos Preview vs DeepSeek V3.2 Speciale