Compare · ModelsLive · 2 picked · head to head
Claude Mythos Preview vs Claude Opus 5.5
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
#5 by perf·no signal
Claude Opus 5.5
#3 by perf·#6 by attention
Best value
Claude Opus 5.5
Claude Mythos Preview
—
no price
Claude Opus 5.5
6.9 pts/$
$12.00/M
Vendor risk
Who is behind the model
Anthropic
$965.0B·Tier 1
Anthropic
$965.0B·Tier 1
Head to head
1 benchmark · 2 models
Claude Mythos PreviewClaude Opus 5.5
GPQA diamond
Claude Mythos Preview leads by +7.0
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
Claude Opus 5.5
87.5
Full benchmark table
| Benchmark | Claude Mythos Preview | Claude Opus 5.5 |
|---|---|---|
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 | 87.5 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| — | — | 1.0M tokens (~500 books) | — | |
| $4.00 | $20.00 | 1.0M tokens (~500 books) | $80.00 |