What we’re watching.

As previously promised , here's Anthropic's new fast, low cost model: Introducing Claude Haiku 5.5 . The previous Haiku, 4.5, was very much showing its age. It came out almost a year ago , and was priced at $1/million input and $5/million output - relatively expensive even back then, and a full 10x the price of OpenAI's GPT-6 Luna , released last month. The new Haiku exactly matches the price of GPT-6 Luna - $0.10/$0.50 - up to 100,000 tokens. Beyond 100,000 tokens the price increases 5x to $0.50/$2.50. Luna itself has a price increase at 272,000 tokens but only to $0.20/$0.75. Haiku 5.5 also

What's changed Added Claude Haiku 5.5 ( claude-haiku-5-5 ), now the default Haiku model on the Anthropic API — 1M context, $0.10/$0.50 per Mtok ($0.50/$2.50 for prompts over 100K) Added agentType to the subagentStatusLine payload, so scripts can tell custom subagent types apart Added isDeferred to $.tool.register for mods: false lists the tool's schema in the prompt from the start instead of behind tool search Fixed Claude sometimes treating its own last actions before a context compaction as done after it, and retracting or redoing finished work Fixed a memory leak where an HTTP MCP connectio

0.132.0 (2026-10-07) Full Changelog: sdk-v0.131.0...sdk-v0.132.0 Features api: add claude-haiku-5-5 and typed computer and browser toolset tool calls ( 1fd8261 ) api: add disabled to thinking types in model capabilities ( 2b75b49 ) api: add display_name to RBAC roles and deprecate name ( 7735ac3 ) api: add include_default parameter to list workspaces ( c4019df ) api: add lifecycle stage fields and filter to /v1/models ( fe8a762 ) api: add line to model objects ( 018aed4 ) api: add url_sources to the Managed Agents web_fetch tool config ( 2b75b49 ) api: add web search and code execution support

What's changed Added --marketplace to claude plugin install : adds the marketplace if needed, under the same policy checks as claude plugin marketplace add , then installs the plugin from it Added an effort parameter to the Agent tool, so Claude runs a sub-agent at the effort level you ask for Added CLAUDE_CODE_OVERLOADED_RETRY_BASE_DELAY_MS environment variable to set a longer base delay for the backoff when retrying an overloaded (529) request Added prompt.autocomplete , an event a mod hooks to add its own rows to the prompt box's autocomplete list Added prompt caching to $.model.complete fo

The "old" version of Cowork runs model inference in the cloud, executing tool calls in an Anthropic-provided VM we shipped to your computer. We added the VM for capability, safety, and security reasons - mapping in just the data you explicitly added to your session. People loved what they were able to do with Claude but didn't love the disk, battery, and performance cost of running the VM locally. Also, people didn't love that closing your laptop means the work stops. The "new" version of Cowork runs model inference and the VM in the cloud. Each session gets its own sandbox, not sharing state

What's changed Added serverToolUses to the result of a mod's turn.step hook: the tool calls the API ran itself (the advisor), each with its id, name, input, start and end Added agentId to the tool.check event of plugin hooks, so a hook can tell a subagent's permission check from the main session's Added ceiling to the question and verdict a mod's tool.check hook reads, naming the approval an organization requires for a tool Added ThemeKey and Color types to the plugin hooks typings, so an editor lists the theme colors a mod's drawing can name Added to claude plugin validate : each hook a mod r

What's changed Fixed a deny or ask rule on a nested part of a compound shell command not holding over a user-installed mod's approval on managed machines Fixed the terminal freezing on short code blocks with many unclosed tags or deeply nested ${ substitutions Fixed Read deny rules not applying to files @-mentioned, changed, or selected in the IDE through a symlink [VSCode] Reverted a 2.1.288 change to claude auth status that may have made sign-outs more frequent Improved how quickly large files open in a plugin code pane by laying the highlighted view out once at its final width Fixed plugin

What's changed Added $.ui.selection() for mods: returns the text you last selected in fullscreen mode and, when the selection lies within one transcript row, that row Added a built-in gh api to cloud sessions whose image has no GitHub CLI, and fixed the built-in sending control characters from file names, jq filters or GitHub errors to the terminal Added recovery for a prompt cleared with Ctrl+C: pressing Up on the empty prompt brings the draft back, including pasted text and images Added a re-authenticate prompt when an MCP server asks for more OAuth scope during a tool call Added --max-findi