Claude Sonnet 5 (claude-sonnet-5) becomes the default Sonnet tier model, replacing Claude Sonnet 4.6. The sonnet alias now resolves to claude-sonnet-5.
Full adaptive thinking support (max effort level enabled)
Available on all providers: first-party Anthropic API, Bedrock (us.anthropic.claude-sonnet-5), Vertex (claude-sonnet-5), Foundry, Gateway, and Mantle (anthropic.claude-sonnet-5)
Sonnet 4.6 is retained in the model picker as "Sonnet 4.6 · Previous Sonnet version"
Hook examples in settings/CLAUDE.md now reference claude-sonnet-5
Evidence
SONNET_ID constant updated (search for "claude-sonnet-5" in model constants; SONNET_NAME: "Claude Sonnet 5")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
