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
- Anthropic Python SDK Releases sdkaiengineer ·
Anthropic Python SDK v0.109.0 adds Managed Agents API support
Anthropic's Python SDK has been updated to version 0.109.0, introducing support for Managed Agents deployments. This feature allows developers to leverage advanced agent capabilities within their applications. The update also includes support for environment variable credentials, simplifying authentication for users. This release is now available for all users of the Python SDK.
feature - Claude Code Releases sdkaigaengineer ·
Anthropic Claude Code v2.1.170: Fable 5, Session Fixes
Anthropic has released Claude Code version 2.1.170, introducing the new Mythos-class model Claude Fable 5, now safe for general use and exceeding previous model capabilities. This update also resolves an issue where sessions and transcripts were not saved or retrievable via `--resume` when launched from specific terminal environments. This patch is available now for all users.
feature patch - Claude Release Notes ai ·
Anthropic Launches Claude Fable 5 Model
Anthropic has released Claude Fable 5, a Mythos-class model that is now safe for general use. This launch provides a new, more broadly applicable AI model for users. Further details are available in a related blog post.
feature announcement - Anthropic Python SDK Releases sdkai ·
Anthropic SDK Python Adds New Claude Models and Fallback Support
Anthropic SDK Python version 0.108.0 introduces support for the new claude-mythos-5 and claude-fable-5 models. This release also adds client-side fallback middleware for API providers that do not support server-side fallbacks, enhancing resilience for users. These features are available now for developers using the Python SDK.
feature - Claude Platform Release Notes aipreviewengineer ·
Anthropic Launches Claude Fable 5 and Mythos 5 with 1M Token Context
Anthropic has released Claude Fable 5, their most capable widely available model, and Claude Mythos 5 for Project Glasswing participants. Both models feature a 1 million token context window and enhanced adaptive thinking capabilities. These updates impact users interacting with the Claude API, particularly concerning tokenizer changes, safety classifier responses, and data retention policies for Fable 5.
feature announcement - Anthropic News ai ·
Anthropic Launches Claude Fable 5 and Mythos 5 AI Models
Anthropic has released Claude Fable 5, a highly capable model for general use with safety safeguards, and Claude Mythos 5, a version with lifted safeguards for cybersecurity professionals. Fable 5 excels in software engineering, knowledge work, and vision tasks, while Mythos 5 demonstrates advanced capabilities in drug design and scientific hypothesis generation. Both models are priced significantly lower than their predecessors and are available with different access models.
feature announcement - Claude Code Releases sdkaiengineerfinance ·
Claude Code v2.1.169: Troubleshooting, Directory Navigation, and UI Fixes
This update to Claude Code introduces a `--safe-mode` flag for troubleshooting and a `/cd` command for changing directories mid-session without disrupting the prompt cache. It also includes numerous bug fixes addressing issues with UI responsiveness, enterprise policies, and agent management across platforms. These changes benefit developers and architects troubleshooting complex setups or working with large codebases, offering a more stable and efficient experience.
patch feature - Anthropic Python SDK Releases sdkai ·
Anthropic SDK Python v0.107.0 adds Managed Agents API types
Anthropic's Python SDK has been updated to version 0.107.0, introducing small enhancements to its Managed Agents API types. This update provides developers using the SDK with refined data structures for interacting with Anthropic's agent capabilities. The changes are available immediately for developers who update their SDK.
feature - 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 Code Releases sdkaiengineer ·
Claude Code v2.1.162: Enhanced Agent Features and Bug Fixes
This update for Claude Code introduces several enhancements, including new details in `claude agents --json` to clarify session blocking, improved handling of search tools, and persistent default settings for effort levels. It also addresses numerous bugs, such as silent startup hangs, incorrect permission rule application, and display issues within the agents view, improving overall stability and user feedback for developers using the integrated coding environment.
patch feature - Anthropic News ·
AI-enabled cyber threats analysis by Anthropic's Frontier Red Team
Anthropic's Frontier Red Team analyzed a year's worth of AI-enabled cyber threats, mapping attacker techniques to the MITRE ATT&CK framework. The analysis reveals that malicious actors are increasingly using AI for complex, autonomous operations, challenging traditional risk assessment methods. These findings are informing the development of safeguards for Anthropic's models and discussions with MITRE to evolve the ATT&CK framework.
announcement - Anthropic News ai ·
Anthropic Launches Claude Partner Network Services Track and Partner Hub
Anthropic is expanding its Claude Partner Network by introducing a Services Track with tiered levels and a Partner Hub portal. These initiatives aim to provide customers with clearer visibility into partner capabilities and qualifications for deploying AI in production. The program requires partners to meet specific criteria for certified individuals, deployed customers, and public endorsements, ensuring a consistent standard for firms of all sizes.
announcement feature - Claude Code Releases sdkai ·
Claude Code v2.1.161: Enhanced Usage Metrics, Tool Call Fixes, and UI Improvements
Claude Code version 2.1.161 incorporates `OTEL_RESOURCE_ATTRIBUTES` into metric datapoints for granular usage analysis, and enhances parallel tool call reliability by preventing failed Bash commands from canceling other operations. This patch also introduces UI refinements, improves handling of unused connectors, and addresses several regressions and bugs affecting sessions, policies, and terminal rendering for a smoother developer experience. The update is available now for all users.
patch feature - Claude Platform Release Notes aimedia ·
Claude Platform Enhancements: Output Capping and Refusal Billing
Claude Platform now supports a `max_tokens` parameter for the advisor tool to reduce latency and costs by capping output. Additionally, users are no longer billed for requests that result in a refusal without any output. These changes are available on the Claude API and aim to improve efficiency and cost management for developers utilizing the advisor tool and handling refusals.
feature patch - Anthropic News aisecurityengineer ·
Anthropic Expands Project Glasswing to 150 New Organizations
Anthropic is expanding Project Glasswing, an initiative to secure critical software, to approximately 150 new organizations across over 15 countries. This expansion aims to leverage AI, specifically Claude Mythos Preview, to scan codebases for vulnerabilities and promote more secure software development practices in the face of increasingly powerful AI models. The program now includes organizations in diverse sectors like power, water, and healthcare, and emphasizes the need for robust safeguards as AI capabilities advance. New partners will undergo security reviews before gaining access.
announcement feature - Claude Release Notes aiengineer ·
Anthropic adds custom admin roles for enterprise
Anthropic has extended its custom roles framework to include admin permissions for enterprise plans. This feature allows organizations to grant specific administrative access, such as managing billing or privacy settings, to team members without assigning them full owner privileges. This granular control is now available for enterprise customers.
feature - Anthropic News aiengineerfinance ·
Anthropic Confidentially Submits Draft S-1 to SEC for Proposed IPO
Anthropic has confidentially submitted a draft S-1 registration statement to the SEC for a proposed initial public offering, contingent on market conditions. This filing provides the option to go public following the SEC's review, with share numbers and pricing yet to be determined. The announcement is a notice under Rule 135 and is not an offer to sell securities.
announcement - Claude Platform Release Notes ai ·
Claude Platform Updates: New Models, Tools, and AWS Integration
Anthropic has released new models like Claude Fable 5 and Claude Opus 4.8, featuring expanded context windows and improved adaptive thinking. Updates to tools like the code execution and web search tools enhance agentic workflows. Key features include mid-conversation system messages and expanded Claude Managed Agents capabilities on AWS. These updates are relevant to developers and architects integrating Claude into applications.
feature deprecation patch - Anthropic Python SDK Releases sdkai ·
Anthropic SDK Python v0.105.0 adds Claude 4 Opus support and file size caps
Anthropic's Python SDK has been updated to version 0.105.0, introducing support for the Claude 4 Opus model and allowing for custom file size caps. This release also includes enhancements to mid-conversation system blocks and detailed token usage. These updates are available now for developers integrating Anthropic's models into their Python applications.
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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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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.