Compare · ModelsLive · 2 picked · head to head
Claude Mythos Preview vs GPT-5.1-Codex
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
Claude Mythos Preview wins on 0/0 benchmarks
Not enough overlapping benchmarks to declare a winner yet · Claude Mythos Preview · GPT-5.1-Codex are still filling in scores.
Hype vs Reality
Attention vs performance
Claude Mythos Preview
#2 by perf·#2 by attention
GPT-5.1-Codex
#21 by perf·no signal
Best value
GPT-5.1-Codex
Claude Mythos Preview
—
no price
GPT-5.1-Codex
12.2 pts/$
$5.63/M
Vendor risk
Who is behind the model
Anthropic
$380.0B·Tier 1
OpenAI
$840.0B·Tier 1
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| Claude Mythos Preview | — | — | 1.0M tokens (~500 books) | — |
| GPT-5.1-Codex | $1.25 | $10.00 | 400K tokens (~200 books) | $34.38 |
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