Anthropic
The same base model, different access terms
On November 9, Anthropic introduced Claude Fable 5.2 and Mythos 5.2. The two versions share a base model but have different safety boundaries and access terms.
Fable is generally available, while using Mythos for cybersecurity and life sciences requires organization verification. Anthropic recommends these models for the hardest technical work and Opus 5.5 for most everyday tasks.
Pricing
In standard mode, input costs $8 and output costs $40 per million tokens. Optional fast mode raises those prices to $16 and $80. The provider's speed and benchmark claims come from its own evaluations.
OpenAI