Heads up, AWS Bedrock users. If you're using Anthropic's models, Mythos and Fable will require you to opt-in to data sharing with Anthropic. This is especially dangerous for orgs that have agreements (e.g. BAA) with AWS, but not Anthropic.
https://aws.amazon.com/blogs/aws/anthropic-claude-fable-5-on-aws-mythos-class-capabilities-with-built-in-safeguards-now-available/
Taggart :ifin:
npub18w…6q6gg
2026-06-10 17:38:09 UTC
Author Public Key
npub18wjp9tztznztxlxka5ttn5nz448la7c9ckmvdvlptcupgud3ygdqj6q6ggSeen on
wss://relay.ditto.pubPublished at
2026-06-10 17:38:09 UTCEvent JSON
{
"id": "eae28bbd62cebd76ea79ec617b3dcf9ff863544de5b671bc2b3675b525531f7c",
"pubkey": "3ba412ac4b14c4b37cd6ed16b9d262ad4ffefb05c5b6c6b3e15e381471b1221a",
"created_at": 1781113089,
"kind": 1,
"tags": [
[
"proxy",
"https://infosec.exchange/users/mttaggart/statuses/116727027442141502",
"activitypub"
],
[
"client",
"Mostr",
"31990:6be38f8c63df7dbf84db7ec4a6e6fbbd8d19dca3b980efad18585c46f04b26f9:mostr",
"wss://relay.ditto.pub"
]
],
"content": "Heads up, AWS Bedrock users. If you're using Anthropic's models, Mythos and Fable will require you to opt-in to data sharing with Anthropic. This is especially dangerous for orgs that have agreements (e.g. BAA) with AWS, but not Anthropic.\n\nhttps://aws.amazon.com/blogs/aws/anthropic-claude-fable-5-on-aws-mythos-class-capabilities-with-built-in-safeguards-now-available/",
"sig": "b68b9eb261724bb6e4a259740578100dc42f71ed565d0be34c7a5a6fab809863084ae95e4da9a6de76af233d4f0becb01c45a643affa8d5defb49a5a949fe9a3"
}