In Python SDK 1.10.0, TypeScript SDK 0.130.0, C# SDK 12.52.0, Go SDK 1.77.0, Java SDK 2.67.0, PHP SDK 0.53.0, Ruby SDK 1.75.0, and version 1.37.0 of the ant CLI, the Admin API methods for organization info, members, invites, workspaces, API keys, rate limits, service accounts, workload identity federation, customer-managed encryption keys, and compliance...
Internal/Other Changes Updated bundled Claude CLI to version 2.1.286 CI: pinned the model for issue triage to fix failures caused by the CLI's new default model PyPI: https://pypi.org/project/claude-agent-sdk/0.2.163/ bash pip install claude-agent-sdk==0.2.163
- Added a count such as "2 of 5" to the permission prompt when several permission requests stack up Added mouse support for the "N more" rows of lists in fullscreen mode: click one to jump to that end of the list, with hover and pressed states Fixed several Claude Code processes and IDE extensions each opening a login browser when gcpAuthRefresh or...
Internal/Other Changes Updated bundled Claude CLI to version 2.1.285 PyPI: https://pypi.org/project/claude-agent-sdk/0.2.162/ bash pip install claude-agent-sdk==0.2.162
- Added CLAUDE_CODE_DISABLE_WEB_FETCH environment variable to turn off the WebFetch tool Added claude --desktop to open the Claude desktop app on the current directory, or on a session with --continue / --resume Added claude plugin configure to show a plugin's options and which are unset, or save new values read from stdin with --values-stdin Added .
Code written for Claude Sonnet 5 can break on Claude Sonnet 5.5 in five ways. To turn off up-front thinking, send thinking: {"type": "between_tools"} instead of "disabled", at high effort or below. Forced tool use (tool_choice types any and tool) returns a 400 error. Thinking blocks are tied to the model and the conversation.
Internal/Other Changes Updated bundled Claude CLI to version 2.1.284 PyPI: https://pypi.org/project/claude-agent-sdk/0.2.161/ bash pip install claude-agent-sdk==0.2.161
- Added Claude Sonnet 5.5 (claude-sonnet-5-5), now the default Sonnet model on the Anthropic API , 1M context, $2/$10 per Mtok with $0.20/Mtok cache reads Added a "Yes, but ask again next time" answer to auto mode's prompt before a read outside the working directories, so you can allow that one read and still be asked about later ones Added dollar amounts...
Developers can now submit plugins to the Claude directory via a new portal. The portal includes features to track submissions through review and view usage analytics.
Bug Fixes Fixed follow-up turns failing after background subagents: When using query() with hooks, can_use_tool, or SDK MCP servers, stdin was closed too early if a subagent finished just before the turn's result arrived. Follow-up turns would then fail with "Stream closed" and the model would report the tool as refused.
- Added x-claude-code-prompt-id to the gateway hint headers so LLM gateways can group the requests that serve one user prompt; opt in with CLAUDE_CODE_GATEWAY_HINT_HEADERS=1 Added availableModelsMatch managed setting: with "exact", an availableModels entry allows only the model version it names, so new releases stay blocked until listed Added deniedModels...
The Compliance API local session endpoints are out of beta for Claude for Microsoft 365 sessions in Excel, PowerPoint, Word, and Outlook (product_surface values beginning with office_agents). See Sessions on users' machines.
- Added a maxProseWidth setting that caps the width of Claude's prose in wide terminals while tables and code blocks keep the full width Added a startup notice, and /status and claude doctor entries, listing telemetry variables in a project's settings files that were ignored or that turned telemetry off Added the allowClaudeInChromeWithManagedMcp managed...
Cache diagnostics is out of beta on the Claude API and no longer requires the cache-diagnosis-2026-04-07 beta header. Include the diagnostics object on a Messages request to opt in; requests that still send the header work as before.
New Features verbatim_prompts option : Added ClaudeAgentOptions.verbatim_prompts (default False ). When True , user messages are delivered to the CLI exactly as written , no @path file expansion and no slash-command dispatch. This prevents untrusted text inlined into prompts from triggering unintended file reads or command execution.
What's changed Added Claude apps gateway support for newer Claude Desktop keys in desktop policy blocks, including blockReadsOutsideWorkingDirectories and disableBypassPermissionsMode Added assume_role on Claude apps gateway Bedrock upstreams: the gateway calls Bedrock as an IAM role it assumes through STS, in another AWS account if needed, optionally one...
Claude Opus 5.5 is the first model in the Claude 5.5 family. It performs at the level of Claude Fable 5.1 while costing 40% less than Opus 5.
Anthropic launched Claude Opus 5.5, the first model in the Claude 5.5 family. It performs at the level of Claude Fable 5.1 on most work and costs 40% less to run than Opus 5.
What's changed Added Claude Opus 5.5 ( claude-opus-5-5 ), now the default Opus model , 1M context, $4/$20 per Mtok with $0.20/Mtok cache reads Added mouse support to more lists in fullscreen mode: the wheel scrolls the /skills list, and a skill's state options in /plugin can be clicked Added CLAUDE_CODE_MAX_MCP_DESCRIPTION_LENGTH to change the...
What's changed Changed auto mode for Claude API and Enterprise users, and on Bedrock, Vertex, Foundry and gateways, to default to the server-side classifier, which does not charge for classifier overhead ( CLAUDE_CODE_AUTO_MODE_SERVER=0 opts out on Bedrock, Vertex, Foundry and gateways); warns on billed fallback.
Compliance API local session endpoints now return transcripts of Claude in Chrome sessions (product_surface claude_in_chrome) for Claude Enterprise organizations, using the existing Compliance Access Key and read:compliance_user_data scope.
Internal/Other Changes Updated bundled Claude CLI to version 2.1.276 PyPI: https://pypi.org/project/claude-agent-sdk/0.2.156/ pip install claude-agent-sdk==0.2.156
What's changed Fixed every request failing with 400 … Input tag 'advisor_20260301' when ANTHROPIC_BASE_URL points at a proxy or gateway (2.1.275 regression)
Internal/Other Changes Updated bundled Claude CLI to version 2.1.274 PyPI: https://pypi.org/project/claude-agent-sdk/0.2.154/ pip install claude-agent-sdk==0.2.154
What's changed Added a visible warning when memory usage is critical, with steps to free memory or restart safely Added CLAUDE_CODE_MCP_STARTUP_WAIT_MS to bound how long the first non-interactive turn waits for connecting MCP servers ( 0 = don't wait) Added effort attribute to the claude_code.llm_request OpenTelemetry trace span, matching the api_request...
Users can now request designs, presentations, and documents within any conversation, including Claude Code and the Artifacts tab. These features are available on all plans, with enterprise-specific beta controls.
A new Salesforce plugin allows users to manage accounts, opportunities, and pipelines directly within Claude using 37 pre-built sales skills. It is available in beta on all paid plans for approved organizations.
New Features snapshot option for system prompts : Added a snapshot field to SystemPromptPreset and a new SystemPromptCustom typed dict. When snapshot is True, the session keeps the system prompt recorded on its first request, improving prompt-caching behavior across resumed sessions.
What's changed Bug fixes and reliability improvements
Under the thinking-binding-controls-2026-08-01 beta header, input_transformations can report thinking_mismatch_allowed for thinking blocks that failed an unenforced prefix check. Logging these entries helps find conversation history edits in production traffic.
What's changed Added fast mode in Claude Code Remote sessions (cloud and self-hosted runners): the host's fast-mode setting or /fast typed in the session applies where your organization allows it Added mouse support to the /config panel in fullscreen mode: the wheel scrolls the settings list, a click on a setting's value changes it, and the row under the...
What's changed Fixed read-only git commands in Bash unexpectedly asking for permission after a session had been running for a while (regression in 2.1.269)
- Added claude plugin eval: run a plugin's eval suite against Claude Code and get scored, reproducible results (JSON + HTML report); see claude plugin eval --help Added /output-style [name] to list and switch output styles, including over Remote Control and in cloud and other headless sessions Added a diff of the files a Bash command changed to the Bash...
ant beta:sessions connect attaches a terminal to a Claude Managed Agents session so you can follow it live, send messages and approve or deny pending tool calls. --web serves the Console session viewer locally.
Smart reports analyze how a team uses Claude and report on the work done, what it costs, where sessions hit friction, and which repeated patterns are worth packaging as shared skills. Available in beta on Claude Enterprise plans.
Per-message effort changes are now available in beta on Google Cloud for Claude Fable 5.1, Claude Mythos 5.1 and Claude Opus 5, using the same mid-conversation-output-config-2026-07-01 beta header.
Internal/Other Changes Updated bundled Claude CLI to version 2.1.259 PyPI: https://pypi.org/project/claude-agent-sdk/0.2.152/ pip install claude-agent-sdk==0.2.152
Anthropic launched Claude Fable 5.1 and Claude Mythos 5.1, designed for coding and knowledge work.
Anthropic launched Claude Fable 5.1 and Claude Mythos 5.1, described as its most advanced models for coding and knowledge work.
Internal/Other Changes Updated bundled Claude CLI to version 2.1.257 PyPI: https://pypi.org/project/claude-agent-sdk/0.2.150/ pip install claude-agent-sdk==0.2.150
Releasesby Glyph