Claude Fable 5.2 launches with a week of included Pro access

Anthropic released Claude Fable 5.2 and Mythos 5.2 on November 9, alongside a temporary way for Pro subscribers and standard Team seats to use Fable within their subscription limits. The models share an underlying system; Mythos access is reserved for verified organizations working in cybersecurity or life sciences.

Standard API prices are $8 per million input tokens and $40 per million output tokens. The previous 5.1 release listed $10 input and $50 output, making both base token rates 20% lower. This compares the input and output unit prices.

The launch offer allocates up to 50% of weekly subscription usage to Fable models for eligible Pro and standard Team users. Included usage and the promotional reset expire November 16 at 11:59 p.m. Pacific Time, after which enabled accounts use usage credits.

Google Cloud lists Fable 5.2 as generally available, with text, image and PDF inputs and text output. Its documented limits are one million input tokens and 128,000 output tokens. US and European multi-region endpoints and a global endpoint are listed, with processing locations and quotas specified separately.

Fast mode has separate billing and capacity

On Google Cloud, fast mode uses pay-as-you-go billing at twice the standard rates for input, output, cache writes and cache hits. It draws from a separate quota pool. Provisioned Throughput is unsupported: a fast request carrying the dedicated-throughput header is throttled with an HTTP 429 response.

Claude Code also supports Fable 5.2 as an advisor to another model. The experimental Advisor tool sends the full conversation, including tool calls and results, to a second model for guidance at decision points or after recurring errors. It requires the Anthropic API and is unavailable through the AWS, Google and Microsoft cloud routes. Advisor use contributes to billing; Fable 5.2 requires Claude Code version 2.1.321 or later.

Data handling is another condition of access. Anthropic's Covered Models policy lists Fable 5.2 as generally available and Mythos 5.2 as limited access. Anthropic describes a default 30-day retention window for prompts and responses, with automated safety review. Safety investigations or legal obligations can extend retention. Google Cloud’s model documentation specifies storage for up to 30 days for abuse monitoring.

A separate design, Enterprise Frontier Safeguards, puts monitoring records in customer-controlled cloud storage under the customer's keys. Announced on September 1 for phased rollout, EFS sends flagged activity to the customer's reviewers. The November 9 launch describes EFS as a private beta. Anthropic charges no EFS fee, while cloud storage, reads, writes and egress are billed by the cloud provider. Current Covered Models guidance offers eligible organizations a temporary zero-retention transition for their internal business applications.

A Fable reset restores weekly usage spent on Fable and refills the entire five-hour window where one exists. The regular weekly reset schedule remains in place. Restored usage is shared across the account, including Claude Code, the web and mobile apps. Previously billed extra usage and the usage-credit balance are unaffected.

Reset eligibility requires paid billing before November 9 at 10 a.m. Pacific Time, with additional organization and membership conditions for team seats. Canceling or downgrading removes an unused reset. A used reset cannot be reversed; remaining resets show their expiry in the account's Usage settings.