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 332 Anthropic releases · Updated
- Claude Code Releases sdkaigaengineermedia ·
Claude Code v2.1.283 Adds Gateway Hints, Model Controls, and Bug Fixes
Anthropic's Claude Code v2.1.283 introduces several new features, including `x-claude-code-prompt-id` for LLM gateways and managed settings for stricter control over available and denied models. The update also adds prompt auditing tools for `CLAUDE.md` files and an opt-in load test mode for gateway configurations. This release significantly improves stability and developer experience by addressing numerous bug fixes across SDK sessions, MCP server interactions, plugin management, and various UI/UX elements. Developers working with Claude Code, particularly those using gateways and custom plugins, will benefit from these enhancements and fixes.
feature patch - Claude Release Notes aigaengineer ·
Anthropic Launches Developer Portal for Claude Plugin Submissions
Anthropic has launched a new developer portal to streamline the submission and management of plugins for Claude. Developers can now submit their plugins to the Claude directory, track them through the review process, and monitor usage analytics once live. This initiative simplifies the integration of third-party tools, aiming to expand Claude's capabilities and ecosystem. The portal provides essential tools for developers looking to extend Claude's functionality.
feature announcement - Claude Release Notes aipreviewengineer ·
Claude Adds In-Conversation Design, Deck, and Document Creation
Anthropic's Claude now allows users to create and edit designs, presentations, and documents directly within any conversation, including in Claude Code and the Artifacts tab. These new capabilities, Claude Design, Claude Slides, and Claude Docs, enable collaborative generation and refinement of visual assets and structured content. They are accessible across all Claude plans, including Free, and support features like on-canvas editing and design system import. Enterprise plans can access these features in beta, which are off by default until enabled by an owner.
feature - Claude Release Notes aigaengineer ·
Claude Cowork Fully Integrated into All Conversations
Anthropic is rolling out a new Claude experience that integrates all Claude Cowork capabilities directly into every conversation. This change eliminates the need for users to select a specific mode, streamlining the process for both quick questions and larger tasks like report generation. Existing chats, Cowork tasks, projects, connectors, and skills will automatically carry over. The integrated experience is gradually becoming available to Pro and Max plan subscribers across web, desktop, and mobile platforms.
feature - Claude Code Releases sdkaigaengineerenergy ·
Claude Code v2.1.282 Patch Improves Stability and Usability
This patch release, Claude Code v2.1.282, introduces numerous fixes to enhance the stability and usability of the AI coding assistant. It addresses issues ranging from API interaction errors and session management inconsistencies to UI glitches and integration problems with third-party providers like Bedrock and Vertex AI. Users will experience a more reliable and polished environment, with notable improvements in handling web search results, continued sessions, and command-line interactions. Minor additions include a `maxProseWidth` setting for terminal display and improved telemetry reporting.
feature patch - Claude Platform Release Notes aipreviewengineer ·
Claude API Refines Cache Diagnostics Fingerprint Storage
The Claude API has updated its cache diagnostics, now storing a request's fingerprint only when the `diagnostics` object is explicitly included. Requests using only the `cache-diagnosis-2026-04-07` beta header will no longer store a fingerprint, leading to `previous_message_not_found` errors if referenced later. Developers using cache diagnostics are advised to include the `diagnostics` object on every turn, setting `"previous_message_id": null` for the first request. This change aims to provide more precise control over cache diagnosis data.
feature - Claude Platform Release Notes aigapreviewengineer ·
Claude API Cache Diagnostics Exits Beta
Anthropic has moved its Cache diagnostics feature for the Claude API out of beta, signifying enhanced stability and wider accessibility. This change allows developers to utilize cache diagnostics without needing a specific beta header, simplifying integration. To opt in, developers include a `diagnostics` object on Messages requests, and all `POST /v1/messages` responses will now consistently feature a `diagnostics` field, which is `null` if not explicitly requested.
feature announcement - Claude Platform Release Notes governancegapreviewengineer ·
Anthropic updates Claude platform billing for refusals and enhances Compliance API
Anthropic has updated its billing policy to resume charges for certain low false-positive refusal categories on the Claude platform, affecting how users manage costs for AI interactions. Additionally, local session endpoints for the Compliance API are now generally available for Claude for Microsoft 365, offering improved oversight for enterprise deployments. The Compliance API's Activity Feed has also been updated to no longer return file or document names, enhancing data privacy and requiring specific keys for name lookups.
feature announcement - Claude Code Releases sdksecuritygaengineerenergy ·
Claude Code v2.1.281 Delivers Security Enhancements and Stability Fixes
Anthropic has released Claude Code v2.1.281, a patch update focusing on improved stability, security, and developer control. This version introduces expanded Claude apps gateway support for newer Desktop keys, adds IAM role assumption and Bedrock guardrail application for Bedrock upstreams, and allows for custom telemetry attributes. The release also addresses numerous bugs, including critical fixes for session crashes, infinite retries, history integrity issues, and various tool call failures. These updates enhance the reliability and secure operation of Claude Code for developers using its interactive and non-interactive features, especially with AWS Bedrock integrations.
feature patch - Anthropic News aidata-scientist ·
Anthropic's Claude AI discovers novel enzyme system resembling CRISPR
Anthropic has launched a new life sciences research group and laboratory, demonstrating Claude's capability to accelerate fundamental biology research. In an early success, Claude autonomously discovered a novel enzyme system (ART) with properties reminiscent of CRISPR, identifying previously uncharacterized features. This initiative showcases a new methodology where AI agents collaborate with human scientists to generate and evaluate hypotheses at scale. A pre-print has been released, detailing the discovery and the AI-driven research process.
announcement - Claude Release Notes aigaengineer ·
Anthropic Launches Claude Opus 5.5 with Better Performance, Lower Cost
Anthropic has launched Claude Opus 5.5, introducing the first model in its new Claude 5.5 family. This model achieves performance comparable to Claude Fable 5.1 on most tasks. Notably, it reduces operational costs by 40% compared to Opus 5. This update aims to provide a more efficient and cost-effective advanced AI model for users.
feature - Claude Code Releases sdkaigaengineerenergy ·
Claude Code v2.1.280 Adds Opus 5.5 Model and Extensive Bug Fixes
Claude Code version 2.1.280 is now available, featuring the integration of Claude Opus 5.5 as the new default Opus model. This model offers a 1M context window and revised pricing tiers. The update also includes a broad array of bug fixes that enhance UI stability, improve auto-mode reliability, and address various input and interaction issues across the application. These changes aim to provide developers and users with a more robust and efficient coding environment.
feature patch - Claude Platform Release Notes aipreviewengineer ·
Anthropic Launches Claude Opus 5.5 Model, Introduces New API Capabilities
Anthropic has launched Claude Opus 5.5, an advanced model designed for long-running agentic coding and knowledge work. It features a larger context window and always-on adaptive thinking, alongside new API capabilities like Fast mode and inline tool definitions. This model aims to enhance complex automated workflows and offers developers more flexible ways to manage tools and model behavior. Developers using the Claude API across various cloud platforms will benefit, though some API changes introduce breaking changes for existing integrations, with specific features available in research preview or beta.
feature breaking - Anthropic Python SDK Releases sdkaipreviewengineermedia ·
Anthropic Python SDK v1.8.0 adds Claude Opus 5.5 and enhanced tool definitions
Anthropic has released version 1.8.0 of its Python SDK, introducing support for the `claude-opus-5-5` model. This update also brings beta support for inline tool definitions and tool-list pinning, allowing developers greater flexibility in integrating custom tools with Anthropic models. The release addresses several bug fixes, including improvements to streaming stability and immediate effect for `add_tools()` calls. These enhancements primarily benefit developers building AI applications using the Anthropic platform, enabling them to leverage newer models and more robust tool-use capabilities.
feature patch - endoflife.date eolclaude ·
Anthropic Claude claude-sonnet-4-5-20250929 reaches end of life in 7 days
Anthropic Claude claude-sonnet-4-5-20250929 reaches end of life on 2026-09-29 (7 days from now).
deprecation - Claude Code Releases sdkaiengineer ·
Anthropic Claude Code Auto Mode Defaults to Server-Side Classifier, Reduces Billing Overhead
Anthropic has updated the default behavior for Claude API, Enterprise, Bedrock, Vertex, Foundry, and gateway users employing auto mode. This change routes classifier operations to a server-side service, eliminating charges for classifier overhead. Users can opt out of this new default via an environment variable (`CLAUDE_CODE_AUTO_MODE_SERVER=0`) on supported platforms. A new status row in `/status` indicates if the server-side classifier is active for the session.
feature patch - Anthropic News aiarchitect ·
Anthropic Partners with Accenture for Independent Embedded AI Evaluation
Anthropic has announced a partnership with Accenture to establish independent embedded evaluation for its frontier AI models. This initiative, led by Accenture's specialist AI business Faculty, involves evaluating, red-teaming, and assessing the alignment and safeguards of Anthropic's models. Both companies commit to investing at least $1 billion over five years to build capacity in this new evaluation approach. Embedded evaluators will gain deep internal access to assess operations, verify safety commitments, and report incidents, enhancing accountability for AI safety.
announcement - Claude Code Releases sdkaideprecationengineerenergy ·
Anthropic Claude Code v2.1.277 Updates with AGENTS.md Support and Bug Fixes
This patch release for Anthropic Claude Code, version 2.1.277, introduces support for AGENTS.md as an alternative to CLAUDE.md for project instructions, alongside several enhancements for Claude apps gateways. Gateway improvements include options for egress proxy handling and sending static headers to upstream proxies. The update also delivers a significant number of bug fixes addressing issues like hung sessions, conversation failures, unexpected logouts, and problems with plugin management and tool execution. These changes improve stability, reliability, and configuration flexibility for developers using the Claude Code CLI, SDK, and related applications.
feature patch - Anthropic Python SDK Releases sdkaipreviewdeprecationengineer ·
Anthropic Python SDK v1.7.0 Adds Rate Limit Display Names and Tool Runner Updates
Anthropic has released version 1.7.0 of its Python SDK, introducing a new display name field for rate limits while deprecating the `group_type` parameter. This update also enhances the tool runner with a `compact_before_next_turn()` method, improving state and failure handling for tools. The release includes several bug fixes for API error handling and client response parsing, alongside various internal chores and documentation updates. These changes primarily affect developers building applications with the Anthropic API in Python.
deprecation feature patch - Claude Code Releases sdkaiengineer ·
Anthropic Claude Code v2.1.276 Fixes `400 Input tag` Error
Anthropic Claude Code v2.1.276 addresses a critical bug that caused all requests to fail with a `400 Input tag` error. This issue specifically affected users pointing `ANTHROPIC_BASE_URL` to a proxy or gateway. The patch resolves a regression introduced in version 2.1.275, ensuring proper functionality for these configurations.
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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.