Claude Code 2.1.283: teams can now block or pin which models run
New managed settings pin teams to an approved model list — plus a Bedrock Mantle provider, SDK tool-call fixes, and agent upgrades from GitHub and Vercel.
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Block or pin the models Claude Code runs
2.1.283 adds two managed settings: `deniedModels` blocks specific models outright, and `availableModelsMatch: "exact"` forces an exact version match. Admins can standardize a team on approved models — and keep a pricier Opus off the menu — instead of trusting everyone to pick the right one.
Bedrock Mantle lands as a provider
The same release adds `mantle` as an upstream provider for Amazon Bedrock's Mantle endpoint. If your org routes Claude through Bedrock, that path is now first-class in the CLI config rather than a workaround.
The SDK stops dropping deferred tool calls
2.1.283 fixes SDK sessions that lost deferred tool calls when a turn ended early, stops discarding MCP progress notifications on long-running tools, and no longer leaves stdio MCP servers running after a session ends. Fewer silent hangs for anyone building agents on the SDK.
GitHub's autofix now reads Copilot Memory
GitHub's agentic autofix for code-scanning alerts now pulls repo context from Copilot Memory, so proposed security fixes match your codebase's conventions instead of generic patches. Live now for code scanning.
Vercel Sandboxes get persistent disks
Sandbox Drives hit public beta: persistent storage of up to 16 TiB you can attach to a Vercel Sandbox. Agents and build jobs can finally keep state — caches, checkouts, datasets — across runs instead of starting cold every time.