What
In the model picker, the list where you choose which Claude model to use, the Sonnet 4.6 entry now reads "Sonnet 4.6 · Legacy". It used to read "Sonnet 4.6 · Previous Sonnet version". Sonnet 5.5 is now shown as the current Sonnet.
Why
The new label signals that Sonnet 4.6 is on its way to being retired, so it is worth planning a move to a newer model if you still pick it.
Names in the bundle/model
The entry above is what we published on the day. These lines were added later, as Anthropic's own pages caught up, and they sit beside the original rather than replacing it.
Added since
A small documentation edit on Claude Code on Amazon Bedrock touched a line naming /model after this was published.
The [setup wizard](#sign-in-with-bedrock) offers a 1M context option when it pins models. To enable it for a manually pinned model instead, append `[1m]` to the model ID. See [Pin models for third-party deployments](/docs/en/model-config#p…amazon-bedrock see the edit
Confirmed since
Anthropic's documentation has since written up /model, on spawn.sh: called once per claimed work item.
The SDK's [Client-side MCP helpers](https://platform.claude.com/docs/en/agents-and-tools/mcp-connector#client-side-mcp-helpers) convert the server's tools into the runnable tools the worker accepts. Install an MCP SDK alongside the Anthrop…managed-agents/self-hosted-sandboxes see the edit
Two sources agreeTwo things we can check say the same as this entry.
Anthropic's documentation agrees
Anthropic's documentation has since written up /model, on spawn.sh: called once per claimed work item.
Anthropic's release notes agree
Fixed the /model picker showing "+1 model" below the list after scrolling to the last model; the count now covers only the models below the…