The new model IDs, API prices, Claude Code switch command and the 30-day data-retention rule, from official docs.
If you use the Claude API or Claude Code, the new model ID is claude-fable-5-2. Anthropic released Claude Fable 5.2 on 9 November 2026, alongside Claude Mythos 5.2 (claude-mythos-5-2). The docs describe them as two configurations of the same new model. Fable 5.2 is generally available. Mythos 5.2 is limited to organisations that pass Anthropic's Cyber or Life Sciences Verification Programs.
API pricing for both is $8 per million input tokens and $40 per million output tokens (USD), down from $10 and $50 on the 5.1 versions. Fast mode is listed at $16 and $80. The context window is 1 million tokens, with up to 128,000 output tokens per request.
To try Fable 5.2 in Claude Code, the docs say you need version 2.1.321 or later, then run /model fable or start with claude --model claude-fable-5-2. No Fable model is the default, so you have to choose it. Anthropic also says Fable models use plan limits faster than other Claude models. One other practical note: both 5.2 models require 30-day data retention and are not available under zero data retention unless Anthropic expressly authorises it.
Anthropic still suggests Opus 5.5 as the daily driver, at $4 input and $20 output, and moving up to Fable for harder, open-ended work. Benchmark figures in the coverage are Anthropic's or Artificial Analysis's, not our tests. This is a research-based summary; we have not tested the models.
Prices, access rules and the official benchmark table are in the full article: https://ainews.useaifix.com/news/claude-fable-5-2-mythos-5-2-launch/
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