Anthropic Claude

October 2026

• Thu 8 Oct New and changed features Product news · The Compliance API chat endpoints now also return chats from the unified Claude experience, in beta for Claude Enterprise organizations, with your existing Compliance Ac…
• Wed 7 Oct Issues and security Ongoing incident · Anthropic (Claude): Elevated errors on platform.claude.com
• Wed 7 Oct Issues and security Service incident · Anthropic (Claude): Issue with spend limits
• Wed 7 Oct Issues and security Service incident · Anthropic (Claude): Elevated errors loading usage data on platform.claude.com
• Wed 7 Oct New and changed features Product news · The Python and TypeScript SDKs now include classes, in beta, for the browser use tool and the computer use tool.
• Wed 7 Oct New and changed features Product news · Claude Max and Team plans now include monthly API credits.
• Wed 7 Oct New and changed features Product news · We've launched Claude Haiku 5.5 (claude-haiku-5-5), our most capable model tuned for high-volume and latency-sensitive work.
• Wed 7 Oct New and changed features Product news · Code written for Claude Haiku 4.5 can break on Claude Haiku 5.5.
• Wed 7 Oct New and changed features Product news · In Claude Managed Agents, a cloud environment with limited networking now also applies its allowed_hosts to the web_search and web_fetch tools.
• Wed 7 Oct New and changed features Product news · With limited networking, creating a session fails with a 400 error when an enabled web tool's allowed_domains has an entry not within allowed_hosts.
• Wed 7 Oct New and changed features Product news · We've launched Claude Haiku 5.5 (claude-haiku-5-5), our most capable model tuned for high-volume and latency-sensitive work.
• Wed 7 Oct New and changed features Product news · Code written for Claude Haiku 4.5 can break on Claude Haiku 5.5.
• Wed 7 Oct New and changed features Product news · The Python and TypeScript SDKs now include classes, in beta, for the browser use tool and the computer use tool.
• Wed 7 Oct New and changed features Product news · We've lowered the price of prompt cache reads on Claude Sonnet 5.5 from $0.20 USD to $0.10 USD per million tokens: 0.05x the base input price instead of 0.1x.
• Wed 7 Oct New and changed features Product news · Claude Max and Team plans now include monthly API credits.
• Wed 7 Oct New and changed features Product news · In Claude Managed Agents, the web_fetch tool now fetches only URLs that have already appeared in the session, for example in the text of a user message, in a web_search…
• Wed 7 Oct New and changed features Product news · In Claude Managed Agents, a cloud environment with limited networking now also applies its allowed_hosts to the web_search and web_fetch tools.
• Wed 7 Oct New and changed features Product news · With limited networking, creating a session fails with a 400 error when an enabled web tool's allowed_domains has an entry not within allowed_hosts.
• Tue 6 Oct Issues and security Service incident · Anthropic (Claude): Elevated errors for Claude Opus 5.5
• Tue 6 Oct New and changed features Product news · We've added capabilities.server_tools to the Models API.
• Mon 5 Oct Issues and security Service incident · Anthropic (Claude): Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1
• Mon 5 Oct New and changed features Product news · We've added capabilities.thinking.types.disabled to the Models API.
• Thu 1 Oct Issues and security Service incident · Anthropic (Claude): Delayed credits on the Claude Platform
• Thu 1 Oct New and changed features Product news · We've added a line field to the Models API.
• Thu 1 Oct New and changed features Product news · Dreams (research preview) now supports Claude Opus 5.5, Claude Fable 5.1, and Claude Sonnet 5.5.

September 2026

• Wed 30 Sep Retirements and dates Product news · We announced the deprecation of the Claude Sonnet 4.5 model (claude-sonnet-4-5-20250929), with retirement on the Claude API scheduled for November 30, 2026.
• Wed 30 Sep Install and upgrade Product news · 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 Adm…
• Tue 29 Sep Issues and security Service incident · Anthropic (Claude): Elevated errors on claude.ai, Claude Code, Claude Cowork and the Claude API
• Mon 28 Sep New and changed features Product news · Code written for Claude Sonnet 5 can break on Claude Sonnet 5.5 in five ways.
• Mon 28 Sep New and changed features Product news · Thinking blocks that Claude Sonnet 5.5 produces work only in the account that produced them, or in an account linked to it.
• Mon 28 Sep New and changed features Product news · We've launched Claude Sonnet 5.5 (claude-sonnet-5-5).
• Thu 24 Sep New and changed features Product news · 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 beginnin…
• Thu 24 Sep New and changed features Product news · We're resuming billing for refusals that arrive before any output when stop_details.category is "bio", "frontier_llm", or "reasoning_extraction", the categories where we…
• Thu 24 Sep New and changed features Product news · The Compliance API Activity Feed no longer returns file names, project document names, or artifact titles.
• Wed 23 Sep New and changed features Product news · Cache diagnostics is out of beta on the Claude API and no longer requires the cache-diagnosis-2026-04-07 beta header.
• Tue 22 Sep Issues and security Service incident · Anthropic (Claude): Elevated errors for multiple models
• Tue 22 Sep New and changed features Product news · Fast mode (research preview) is available for Claude Opus 5.5 on the Claude API.
• Tue 22 Sep New and changed features Product news · We've launched Claude Opus 5.5 (claude-opus-5-5), a model for long-running agentic coding and knowledge work.
• Tue 22 Sep New and changed features Product news · On Claude Opus 5.5, thinking can't be disabled: thinking: {"type": "disabled"} and thinking: {"type": "enabled", ...} return a 400 error.
• Tue 22 Sep New and changed features Product news · Tools can now be defined inside a mid-conversation system message, in beta on the Claude API with the inline-tools-2026-09-15 beta header.
• Fri 18 Sep New and changed features Product news · For cache diagnostics, a response to a request that sends the cache-diagnosis-2026-04-07 beta header now always includes the diagnostics field.
• Fri 18 Sep New and changed features Product news · The Compliance API local session endpoints now also return transcripts of Claude in Chrome sessions (product_surface value claude_in_chrome), in beta for Claude Enterpri…
• Wed 16 Sep Issues and security Service incident · Anthropic (Claude): Issues with Google Play subscriptions
• Tue 15 Sep Issues and security Service incident · Anthropic (Claude): Intermittent error spikes for Claude Mythos 5.1 and Claude Fable 5.1
• Mon 14 Sep New and changed features Product news · With the thinking-binding-controls-2026-08-01 beta header, the input_transformations response field gains a second entry type, thinking_mismatch_allowed.
• Mon 14 Sep New and changed features Product news · The Messages API can now compact a conversation on demand on the Claude API, in beta with the compact-2026-09-04 beta header.
• Fri 11 Sep Issues and security Service incident · Anthropic (Claude): Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1
• Thu 10 Sep Issues and security Service incident · Anthropic (Claude): Elevated latency on the Claude API for some users
• Thu 10 Sep Issues and security Service incident · Anthropic (Claude): Degraded functionality for Claude Cowork on Windows
• Thu 10 Sep New and changed features Product news · Claude Managed Agents permission policies now include auto: the server evaluates each agent or MCP tool call and runs it, denies it, or pauses for your approval.
• Thu 10 Sep Install and upgrade Product news · Version 1.32.0 of the ant CLI adds ant beta:sessions connect, which attaches your terminal to a Claude Managed Agents session.
• Wed 9 Sep New and changed features Product news · For cache diagnostics, the API now stores a request's fingerprint only when the request includes the diagnostics object.
• Thu 3 Sep Issues and security Service incident · Anthropic (Claude): Elevated errors for Claude Sonnet 5
• Thu 3 Sep Issues and security Service incident · Anthropic (Claude): Elevated errors for multiple models
• Thu 3 Sep New and changed features Product news · Per-message effort changes, in beta, are also available on Google Cloud for Claude Fable 5.1, Claude Mythos 5.1, and Claude Opus 5, with the same mid-conversation-output…
• Thu 3 Sep Install and upgrade Product news · Version 1.30.0 of the ant CLI adds ant apply, which creates and updates agents, environments, skills, memory stores, and deployments from files in your repository.
• Wed 2 Sep Issues and security Service incident · Anthropic (Claude): Elevated errors for Claude Sonnet 5
• Tue 1 Sep Issues and security Service incident · Anthropic (Claude): Degraded performance on platform.claude.com and Claude for Microsoft Office 365
• Tue 1 Sep Issues and security Service incident · Anthropic (Claude): Delays in credit purchases
• Tue 1 Sep Issues and security Service incident · Anthropic (Claude): Degraded performance on Claude for Microsoft Office 365
• Tue 1 Sep New and changed features Product news · The guides for the Claude Enterprise endpoints of the Admin API (user management and spend limits), the Claude Enterprise Analytics API, and the Compliance API now show…
• Tue 1 Sep New and changed features Product news · Like Claude Fable 5, both models require 30-day data retention and aren't available under zero data retention unless expressly authorized by Anthropic.
• Tue 1 Sep New and changed features Product news · We've launched Claude Fable 5.1 (claude-fable-5-1), the successor to Claude Fable 5 for long-running agentic coding, knowledge work, and research, alongside Claude Mytho…
• Tue 1 Sep New and changed features Product news · On Claude Fable 5.1 and Claude Mythos 5.1, tool_choice types any and tool aren't supported and return a 400 error.
• Tue 1 Sep New and changed features Product news · Turn-scoped system messages are in beta (mid-conversation-system-clear-at-2026-08-21 header).
• Tue 1 Sep New and changed features Product news · Text generated by Claude Fable 5.1 and Claude Mythos 5.1 carries Anthropic's text watermark, and supported image, video, and audio files that Claude produces through the…
• Tue 1 Sep New and changed features Product news · Thinking blocks produced by Claude Fable 5.1 and Claude Mythos 5.1 are preserved only for the model that produced them or a newer one: earlier models can't read them, an…
• Tue 1 Sep New and changed features Product news · Per-message effort changes are in beta on Claude Fable 5.1, Claude Mythos 5.1, and Claude Opus 5 on the Claude API.
• Tue 1 Sep New and changed features Product news · Prompt cache reads on Claude Fable 5.1 and Claude Mythos 5.1 cost $0.25 USD per million tokens: 0.025x the base input price, compared with 0.1x on other models.
• Tue 1 Sep New and changed features Product news · thinking.display accepts a third value, "updates", in beta (thinking-display-updates-2026-08-18 header).

August 2026

• Mon 31 Aug Issues and security Service incident · Anthropic (Claude): Degraded performance on claude.ai
• Mon 31 Aug Issues and security Service incident · Anthropic (Claude): Degraded performance on claude.ai and Claude Code
• Fri 28 Aug Issues and security Service incident · Anthropic (Claude): Elevated errors on Claude Code and Claude Cowork
• Thu 27 Aug New and changed features Product news · You can now create personal keys and service account keys in the Claude Console.
• Thu 27 Aug New and changed features Product news · In Python SDK 1.2.0, TypeScript SDK 0.122.0, Go SDK 1.68.0, Java SDK 2.59.0, Ruby SDK 1.67.0, and C# SDK 12.44.0, client.beta.files and client.beta.skills no longer send…
• Wed 26 Aug New and changed features Product news · The Compliance API local session endpoints now also return transcripts of Claude Science sessions (product_surface value claude_science) and Claude for Microsoft 365 ses…
• Wed 26 Aug New and changed features Product news · The Compliance API session endpoints are out of beta for Cowork and Claude Code sessions.
• Wed 26 Aug New and changed features Product news · The Admin API is now available in the ant CLI and the Python, TypeScript, C#, Go, Java, PHP, and Ruby SDKs under client.beta.organization.
• Mon 24 Aug Issues and security Service incident · Anthropic (Claude): Issues logging into Claude.ai
• Mon 24 Aug Issues and security Service incident · Anthropic (Claude): Elevated errors for multiple models
• Mon 24 Aug Issues and security Service incident · Anthropic (Claude): Errors logging into Claude.ai
• Thu 20 Aug Issues and security Service incident · Anthropic (Claude): Elevated errors on Google connectors
• Thu 20 Aug Issues and security Service incident · Anthropic (Claude): Elevated errors on requests to multiple models
• Thu 20 Aug New and changed features Product news · The computer use and browser use toolsets (computer_toolset_20260801 and browser_toolset_20260801) are now available on Google Cloud for Claude Fable 5, Claude Mythos 5,…
• Thu 20 Aug New and changed features Product news · We've released v1.0 of the Python SDK.
• Wed 19 Aug Issues and security Service incident · Anthropic (Claude): Degraded performance for Claude Opus 5 and Claude Haiku 4.5
• Wed 19 Aug New and changed features Product news · You can now restrict which sites a Claude Managed Agents agent's web_search and web_fetch tools can reach.
• Wed 19 Aug New and changed features Product news · We've launched the browser use tool (browser_toolset_20260801), a client toolset for driving a browser that your application hosts.
• Wed 19 Aug New and changed features Product news · The Admin API user-management endpoints for Claude Enterprise (claude.ai) organizations (members, invites, groups, and custom roles) are out of beta.
• Wed 19 Aug New and changed features Product news · The computer use tool is out of beta on the Claude API as the computer_toolset_20260801 toolset: no beta header, batch actions (several actions in one turn), zoom enable…
• Wed 19 Aug New and changed features Product news · Claude Managed Agents sessions that run in a self-hosted sandbox can now attach memory stores.
• Wed 19 Aug New and changed features Product news · Both toolsets are available for Claude Fable 5, Claude Mythos 5, Claude Opus 5, Claude Sonnet 5, and Claude Opus 4.8 on the Claude API.
• Wed 19 Aug New and changed features Product news · The session viewer in the Claude Console has been redesigned with a timeline minimap, a transcript grouped by model request, and an Inspector panel for session details a…
• Wed 19 Aug New and changed features Product news · The Files API is out of beta on the Claude API.
• Wed 19 Aug New and changed features Product news · Agent Skills and the Skills API (/v1/skills) are out of beta on the Claude API.
• Tue 18 Aug Issues and security Service incident · Anthropic (Claude): Degraded performance for multiple models
• Tue 18 Aug New and changed features Product news · Workbench is now playground in the Claude Console.
• Mon 17 Aug Issues and security Service incident · Anthropic (Claude): Degraded performance for Claude Opus 5, Claude Sonnet 5
• Sun 16 Aug Issues and security Service incident · Anthropic (Claude): Service disruption on Claude services
• Tue 11 Aug New and changed features Product news · We've added the anthropic-workspace-id response header to the Claude API.
• Tue 11 Aug New and changed features Product news · The Compliance API now returns transcripts of Cowork and Claude Code sessions that run on your users' machines, in beta for Claude Enterprise organizations.
• Mon 10 Aug New and changed features Product news · The introductory pricing for Claude Sonnet 5 ($2 / $10 per MTok) is now the standard price: the previously scheduled increase to $3 / $15 per MTok on September 1, 2026 w…
• Fri 7 Aug New and changed features Product news · You can now control where model inference runs for a Claude Managed Agents agent.
• Fri 7 Aug New and changed features Product news · You can now give a Claude Managed Agents session an advisor: a model at least as capable as the agent's own that the session's primary thread can consult mid-turn for st…
• Fri 7 Aug New and changed features Product news · You can now set a budget on a Claude Managed Agents session: a hard cap on the session's spend, priced at public list rates.
• Fri 7 Aug New and changed features Product news · Claude Managed Agents sessions can now load skills from a GitHub repository.
• Wed 5 Aug Retirements and dates Product news · We've retired the Claude Opus 4.1 model (claude-opus-4-1-20250805).
• Wed 5 Aug New and changed features Product news · Inference hooks are now in beta for Claude Enterprise organizations.
• Mon 3 Aug New and changed features Product news · The Compliance API now returns transcripts of Cowork sessions started on claude.ai web or mobile, in beta for Claude Enterprise organizations.
• Sat 1 Aug New and changed features Product news · Dreams (research preview) now supports Claude Opus 5.

July 2026

• Fri 24 Jul New and changed features Product news · Mid-conversation tool changes are now in beta on Claude Fable 5, Claude Mythos 5, Claude Opus 4.8, and Claude Opus 5: add or remove tools between turns of a conversation…
• Fri 24 Jul New and changed features Product news · We've launched Claude Opus 5 (claude-opus-5), a step-change improvement over Claude Opus 4.8.
• Fri 24 Jul New and changed features Product news · We've removed fast mode for Claude Opus 4.7.
• Fri 24 Jul New and changed features Product news · On Claude Opus 5, disabling thinking is allowed only at effort high or below: thinking: {"type": "disabled"} with effort xhigh or max returns a 400 error, a breaking cha…
• Fri 24 Jul New and changed features Product news · The fallbacks parameter now supports a "default" mode, which applies Anthropic's recommended fallback models by refusal category.
• Fri 24 Jul New and changed features Product news · Effort is the primary control for steering Claude Opus 5: the model supports the full ladder (low, medium, high, xhigh, max), with max for capability-critical work.
• Wed 22 Jul New and changed features Product news · The version field is now optional when updating a Claude Managed Agents agent.
• Wed 22 Jul New and changed features Product news · When creating a Claude Managed Agents session, you can now seed it with initial events.
• Wed 22 Jul New and changed features Product news · Webhooks for Claude Managed Agents now cover the environment and memory store lifecycle: four environment.* event types and three memory_store.* event types.
• Wed 22 Jul New and changed features Product news · Claude Managed Agents session thread event streams now support event deltas.
• Wed 22 Jul New and changed features Product news · You can now set an effort level on a Claude Managed Agents agent's model configuration.
• Fri 17 Jul New and changed features Product news · The experimental prompt tools APIs for generating, improving, and templatizing prompts (/v1/experimental/generate_prompt, /v1/experimental/improve_prompt, and /v1/experi…
• Fri 17 Jul New and changed features Product news · The legacy Workbench (platform.claude.com/workbench) in the Claude Console is being sunset with access ending on August 17, 2026.
• Wed 15 Jul New and changed features Product news · Mid-conversation system messages are available on Claude Fable 5, Claude Mythos 5, and Claude Opus 4.8, on the Claude API, Claude in Amazon Bedrock, and Google Cloud.
• Tue 14 Jul New and changed features Product news · You can now manage the people in your Claude Enterprise (claude.ai) organization with the Admin API, in beta for all Claude Enterprise organizations: list members and lo…
• Fri 10 Jul New and changed features Product news · Dreams (research preview) now supports Claude Fable 5 and Claude Sonnet 5.
• Fri 10 Jul New and changed features Product news · We've expanded the Access Transparency documentation of cmek_preserve events with a filter example, an example event payload, and two preservation reason codes (policy_v…
• Wed 8 Jul New and changed features Product news · You can now set an expiration when you create an API key or an Admin API key in the Claude Console.
• Thu 2 Jul New and changed features Product news · We've added the agent-memory-2026-07-22 beta header, which changes how listing memories (GET /v1/memory_stores/{memory_store_id}/memories) behaves: results are returned…
• Thu 2 Jul New and changed features Product news · The Python (0.116.0), TypeScript (0.110.0), Go (1.56.0), Java (2.48.0), Ruby (1.55.0), PHP (0.36.0), C# (12.35.0), and CLI (1.16.0) SDKs now send agent-memory-2026-07-22…
• Wed 1 Jul New and changed features Product news · We've restored access to Claude Fable 5 and Claude Mythos 5.

June 2026

• Tue 30 Jun New and changed features Product news · Claude Managed Agents vaults now support an injection_location setting on environment variable credentials (the Environment variable tab).
• Tue 30 Jun New and changed features Product news · Claude Managed Agents session event streams now support event deltas.
• Tue 30 Jun New and changed features Product news · We've launched Claude Sonnet 5 (claude-sonnet-5), the next generation of our Sonnet model family, at introductory pricing of $2 / $10 per MTok (made the standard price o…
• Tue 30 Jun New and changed features Product news · Webhooks for Claude Managed Agents now cover the agent, deployment, and deployment run lifecycle.
• Tue 30 Jun New and changed features Product news · When creating a Claude Managed Agents session, you can now override the agent's configuration for that session.
• Tue 30 Jun New and changed features Product news · Listing sessions for Claude Managed Agents now supports backward pagination.
• Mon 29 Jun New and changed features Product news · We've removed fast mode for Claude Opus 4.6.
• Fri 26 Jun New and changed features Product news · We've raised rate limits across the Claude API.
• Thu 25 Jun Retirements and dates Product news · We've deprecated fast mode for Claude Opus 4.7, with removal on July 24, 2026.
• Mon 22 Jun New and changed features Product news · MCP tunnels (research preview): the management API moved from /v1/organizations/tunnels on the Admin API to /v1/tunnels on the Claude API.
• Thu 18 Jun New and changed features Product news · The Python, TypeScript, Go, Java, Ruby, PHP, and C# SDKs now include support for code_execution_20260120, the code execution tool version that adds REPL state persistenc…
• Mon 15 Jun Retirements and dates Product news · We've retired the Claude Sonnet 4 model (claude-sonnet-4-20250514) and the Claude Opus 4 model (claude-opus-4-20250514).
• Thu 11 Jun New and changed features Product news · The code execution tool now supports code_execution_20260521, which discloses the 90-second per-cell execution time limit in the tool description so Claude can budget lo…
• Thu 11 Jun New and changed features Product news · The web search tool and web fetch tool now support web_search_20260318 and web_fetch_20260318, adding a response_inclusion parameter to drop consumed result blocks from…
• Wed 10 Jun New and changed features Product news · The GET /v1/environments/{id}/work endpoint, which lists pending work for a self-hosted sandbox, is now available on Claude Platform on AWS.
• Tue 9 Jun New and changed features Product news · The stop_details.category field on refusal responses now includes "reasoning_extraction" on Claude Fable 5, returned when a request is blocked under Anthropic's Terms of…
• Tue 9 Jun New and changed features Product news · Claude Fable 5 and Claude Mythos 5 use the tokenizer introduced with Claude Opus 4.7.
• Tue 9 Jun New and changed features Product news · We've launched Claude Fable 5 (claude-fable-5), our most capable model open to all customers, alongside Claude Mythos 5 (claude-mythos-5) for Project Glasswing participa…
• Tue 9 Jun New and changed features Product news · On Claude Fable 5 and Claude Mythos 5, thinking.display defaults to "omitted", the same as Claude Opus 4.8, Claude Opus 4.7, and Claude Mythos Preview; set display: "sum…
• Tue 9 Jun New and changed features Product news · On Claude Fable 5 and Claude Mythos 5, adaptive thinking is the only thinking mode: thinking: {"type": "disabled"} is not supported, and manual extended thinking budgets…
• Tue 9 Jun New and changed features Product news · Claude Fable 5 runs safety classifiers on requests and during response generation.

Sorted from how each source classifies its records: what's-new pages, releases, documentation changes, notices, roadmap items, and network changes. A kind is a reading aid, not Microsoft's own category.