Claude Fable 5.1: current reasoning model on Okou
A current reasoning model with Built-in access through Okou.
1M tokens · Text / Vision / Code · Prompt cache
A current reasoning model from Anthropic, available in Okou's public model catalog.
What is Claude Fable 5.1?
Okou currently offers Claude Fable 5.1 in its public reasoning model catalog. Select it with model ID claude-fable-5-1; its relative Built-in cost is tier $$$$.
Specs at a glance
Claude Fable 5.1 pricing
Provider list price, per 1M tokens.
Using Claude Fable 5.1 on Okou
Two ways to access Claude Fable 5.1 on Okou
Okou supports Claude Fable 5.1 as a Built-in model billed in Okou credits, and through bring-your-own with a Anthropic API key. The Built-in path uses Okou Managed routing and the price tier explained below; the bring-your-own path bills you directly with the upstream vendor and skips the Okou credit conversion entirely.
Okou's recommendation
Okou positions Claude Fable 5.1 as a core agent model for orchestration, code-touching work and other steps where a wrong answer is expensive.
Credits and the $$$$ price tier
Okou prices every Built-in model on a four-step credit scale — $, $$, $$$, $$$$ — shown as a badge in the model picker and on the price tier line of zero model ls. Claude Fable 5.1 sits at $$$$. That tier is what you spend from your Okou credit balance; the vendor list price in the table above is what the upstream provider charges before Okou converts it into credits.
Available on Okou since September 2, 2026.
