Anthropic Releases
Anthropic news, Claude releases and SDK updates. New features, breaking changes, security advisories and deprecations - each summarised in plain English and updated continuously.
Tracking 218 Anthropic releases · Updated
- Claude Platform Release Notes aideprecationengineer ·
Claude Workbench and Prompt Tools APIs to be Retired
Anthropic is retiring the legacy Claude Console Workbench on August 17, 2026, and will no longer support saved prompts, variables, or evals. The experimental prompt tools APIs will also be retired on the same date. Users should export any necessary data from the legacy Workbench and be aware that API requests to the retired endpoints will fail after the sunset date.
deprecation - Claude Code Releases sdkaideprecationengineermediaenergy ·
Claude Code v2.1.212: New /fork behavior, background tasks, and fixes
This update for Claude Code introduces a new behavior for `/fork`, copying conversations to background sessions while users continue working. It also adds features like automatic mode reset, session limits for web searches and subagent spawns, and background processing for long-running MCP tool calls. Numerous bug fixes address issues with plan mode, worktree creation, tool failures, and UI elements, improving overall stability and user experience for engineers interacting with code.
patch - Claude Platform Release Notes aigadeprecationengineer ·
Claude Sonnet 5 Launched with 1M Token Context, New Tokenizer
Anthropic has launched Claude Sonnet 5, featuring a 1 million token context window and a new tokenizer that increases token count by approximately 30%. This release impacts users migrating from Sonnet 4.6 due to changes in adaptive thinking and the removal of manual extended thinking. Sonnet 5 is available at introductory pricing until August 31, 2026, with Priority Tier support not included.
feature deprecation patch - Claude Platform Release Notes aideprecation ·
Claude Platform Updates: New Models, Rate Limits, and Tooling
Anthropic has released significant updates to its Claude Platform, including new models like Claude Fable 5 and Claude Opus 4.8 with larger context windows and enhanced capabilities. Rate limits have been raised across the API, and several tools have been updated with new features and versions. The updates also include deprecations and retirements of older models, alongside new SDK support and platform features for managed agents and AWS integration.
feature patch deprecation - Claude Code Releases sdkaideprecationengineer ·
Claude Code v2.1.183: Enhanced Safety and UX Improvements
This release of Claude Code includes significant safety enhancements, particularly around destructive Git and infrastructure commands, and improves the user experience with clearer model warnings and streamlined configuration. It addresses several bugs impacting subagent performance, terminal interaction, and task handling. These updates are primarily for developers and engineers interacting with Claude Code for coding and infrastructure tasks.
patch deprecation - Anthropic Python SDK Releases sdkaideprecation ·
Anthropic SDK Python v0.106.0: Claude Opus 4.1 deprecated, client fixes
Anthropic has released version 0.106.0 of its Python SDK, marking Claude Opus 4.1 as deprecated. This release also includes bug fixes for the Foundry client's copy and with_options methods, and improves schema transformation to preserve $defs. Users of the Python SDK are advised to note the deprecation and benefit from the client enhancements.
feature patch - Claude Platform Release Notes aideprecation ·
Claude Platform Updates: New Models, Deprecations, and Tool Enhancements
Anthropic has released new flagship models, Claude Fable 5 and Claude Opus 4.8, featuring larger context windows and enhanced adaptive thinking. The company is also retiring older models like Claude Sonnet 4 and Opus 4.1, recommending upgrades. Several tools and platform features, including code execution, web search, and managed agents, have received updates and expanded availability on AWS, impacting developers and researchers using the Claude API.
feature deprecation patch - Claude Platform Release Notes aigapreviewdeprecation ·
Claude Platform Updates: Opus 4.8, Mid-conversation System Messages, and Tooling
Anthropic has launched Claude Opus 4.8, their most capable generally available model, featuring a 1M token context window and enhanced reasoning capabilities. The release also introduces mid-conversation system messages and publicly documents the `stop_details` field for refusal responses, benefiting developers integrating Claude into applications. Opus 4.8 is now available via Claude API, Amazon Bedrock, and Vertex AI.
feature patch - Anthropic Python SDK Releases sdkaideprecationengineer ·
Anthropic SDK Python v0.95.0 deprecates Sonnet and Opus 4
Anthropic's Python SDK has released version 0.95.0, marking Sonnet and Opus 4 models as deprecated. This change affects developers using these specific models and signals a shift towards newer model versions within the Anthropic ecosystem. The update also includes an authentication header adjustment for the Bedrock client. This release is now generally available.
feature - Claude Release Notes deprecation ·
Claude Opus 4 and 4.1 models deprecated
Anthropic has removed the Opus 4 and 4.1 model versions from Claude and Claude Code. This change affects users who were utilizing these specific model versions. The company provides an article for guidance on adapting to new model personas following this deprecation.
deprecation
About Anthropic release tracking on ReleaseBytes
Anthropic ships Claude model releases, API updates and SDK versions on a rapid cadence. ReleaseBytes tracks the official Anthropic announcement channels and SDK changelogs, summarising each release and flagging model deprecations and breaking changes so teams building on Claude stay ahead of them.
Frequently asked questions
How often are Anthropic release notes updated on ReleaseBytes? ›
Continuously. ReleaseBytes monitors the official Anthropic release channels around the clock and publishes a plain-English summary of each announcement shortly after it lands.
What kinds of Anthropic changes does ReleaseBytes track? ›
New features, enhancements, bug fixes, security advisories, breaking changes, deprecations and end-of-life announcements. Every item is tagged by type so you can filter to just the changes that need action.
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Set up a free email or Slack alert filtered to Anthropic, subscribe to the weekly digest, or follow the RSS feed. Teams can also install the ReleaseBytes GitHub App or connect via MCP.
Where does the Anthropic release data come from? ›
From the official sources: Anthropic news, Claude releases and SDK updates. Every item links back to the original vendor announcement.