1{2 "schema_version": 2,3 "provider": "anthropic",4 "verified_at": "2026-07-21",5 "verified_region": "us-east-1",6 "source": "AWS Bedrock userguide Anthropic model cards (retrieved 2026-07-21) for Claude Sonnet 5; internal migration reference, Anthropic path (2026-06-24 live probes) for the path metadata and the Opus 4.8 / Haiku 4.5 entries",7 "disclaimer": "Point-in-time capability data. Re-probe every selected model and API path in the target account and region before implementation. Claude Sonnet 5 (launched 2026-06-30, after the reference snapshot) replaces Sonnet 4.6 in the recommendation pool: per its AWS model card it supports Messages on bedrock-mantle as well as Converse/Invoke on bedrock-runtime, with 1M context / 128K output and Global+geo CRIS. Claude Fable 5 / Fable 5.1 and Claude Mythos 5 / Mythos 5.1 — and any later Fable or Mythos release — are deliberately NOT pool candidates (Status `restricted` in pricing-cache.md). Fable 5 and 5.1 are Covered Models that require the account-level aws_review data-retention opt-in (prompts retained up to 30 days for AWS review) — a compliance decision, not a default recommendation; Fable 5.1 (GA 2026-09-01) is additionally CRIS-only in commercial regions. Mythos 5 and 5.1 are gated Previews for vetted cybersecurity and life-sciences research organizations (provider_data_share retention) — no account-level opt-in reaches them. Evidence: AWS model cards model-card-anthropic-claude-fable-5, -fable-5-1, -mythos-5, -mythos-5-1, read 2026-09-03; this file's 2026-07-21 snapshot predates Fable 5.1."