Anthropic.

We launched a beta version of the Ruby SDK .

We've added the ability to group by API key on the Usage and Cost pages of the Developer Console .

We've added two new Last used at and Cost columns and the ability to sort by any column on the API keys page of the Developer Console .

We've retired the Claude 1 and Instant models. Read more in Model deprecations .

Claude Haiku 3.5 is now available on the Claude API as a text-only model.

We've added PDF support for use with the new Claude Sonnet 3.5. Read more in PDF support .

We've also added token counting, which allows you to determine the total number of tokens in a Message prior to sending it to Claude. Read more in Token counting .

The Message Batches API is now available in beta. Process large batches of queries asynchronously in the Claude API for 50% less cost. Read more in Batch processing .

We've loosened restrictions on the ordering of user / assistant turns in our Messages API. Consecutive user / assistant messages will be combined into a single message instead of erroring, and we no longer require the first input message to be a user message.

We've added the ability to disable parallel tool use in the API. Set disable_parallel_tool_use: true in the tool_choice field to ensure that Claude uses at most one tool. Read more in Parallel tool use .

We announced the deprecation of the Claude 1 models. Read more in Model deprecations .

Compare the outputs from different prompts side by side in the new output comparison mode in the Developer Console .

Automatically generate test cases for your prompts using Claude in the Developer Console .

We launched a beta version of the Ruby SDK .

We've added the ability to group by API key on the Usage and Cost pages of the Developer Console .

We've added two new Last used at and Cost columns and the ability to sort by any column on the API keys page of the Developer Console .

We've retired the Claude 1 and Instant models. Read more in Model deprecations .

Claude Haiku 3.5 is now available on the Claude API as a text-only model.

We've added PDF support for use with the new Claude Sonnet 3.5. Read more in PDF support .

We've also added token counting, which allows you to determine the total number of tokens in a Message prior to sending it to Claude. Read more in Token counting .

The Message Batches API is now available in beta. Process large batches of queries asynchronously in the Claude API for 50% less cost. Read more in Batch processing .

We've loosened restrictions on the ordering of user / assistant turns in our Messages API. Consecutive user / assistant messages will be combined into a single message instead of erroring, and we no longer require the first input message to be a user message.

We've added the ability to disable parallel tool use in the API. Set disable_parallel_tool_use: true in the tool_choice field to ensure that Claude uses at most one tool. Read more in Parallel tool use .

We announced the deprecation of the Claude 1 models. Read more in Model deprecations .

Compare the outputs from different prompts side by side in the new output comparison mode in the Developer Console .

Automatically generate test cases for your prompts using Claude in the Developer Console .

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 Enterprise organizations, with your existing Compliance Access Key and the read:compliance_user_data scope. See Sessions on users' machines .

We launched a beta version of the Ruby SDK .

We've added the ability to group by API key on the Usage and Cost pages of the Developer Console .

We've added two new Last used at and Cost columns and the ability to sort by any column on the API keys page of the Developer Console .

We've retired the Claude 1 and Instant models. Read more in Model deprecations .

Claude Haiku 3.5 is now available on the Claude API as a text-only model.

We've added PDF support for use with the new Claude Sonnet 3.5. Read more in PDF support .

We've also added token counting, which allows you to determine the total number of tokens in a Message prior to sending it to Claude. Read more in Token counting .

The Message Batches API is now available in beta. Process large batches of queries asynchronously in the Claude API for 50% less cost. Read more in Batch processing .

We've loosened restrictions on the ordering of user / assistant turns in our Messages API. Consecutive user / assistant messages will be combined into a single message instead of erroring, and we no longer require the first input message to be a user message.

We've added the ability to disable parallel tool use in the API. Set disable_parallel_tool_use: true in the tool_choice field to ensure that Claude uses at most one tool. Read more in Parallel tool use .

We announced the deprecation of the Claude 1 models. Read more in Model deprecations .

Compare the outputs from different prompts side by side in the new output comparison mode in the Developer Console .

Automatically generate test cases for your prompts using Claude in the Developer Console .

We launched a beta version of the Ruby SDK .

We've added the ability to group by API key on the Usage and Cost pages of the Developer Console .

We've added two new Last used at and Cost columns and the ability to sort by any column on the API keys page of the Developer Console .

We've retired the Claude 1 and Instant models. Read more in Model deprecations .

Claude Haiku 3.5 is now available on the Claude API as a text-only model.

We've added PDF support for use with the new Claude Sonnet 3.5. Read more in PDF support .

We've also added token counting, which allows you to determine the total number of tokens in a Message prior to sending it to Claude. Read more in Token counting .

The Message Batches API is now available in beta. Process large batches of queries asynchronously in the Claude API for 50% less cost. Read more in Batch processing .

We've loosened restrictions on the ordering of user / assistant turns in our Messages API. Consecutive user / assistant messages will be combined into a single message instead of erroring, and we no longer require the first input message to be a user message.

We've added the ability to disable parallel tool use in the API. Set disable_parallel_tool_use: true in the tool_choice field to ensure that Claude uses at most one tool. Read more in Parallel tool use .

We announced the deprecation of the Claude 1 models. Read more in Model deprecations .

Automatically generate test cases for your prompts using Claude in the Developer Console .

Compare the outputs from different prompts side by side in the new output comparison mode in the Developer Console .

We launched a beta version of the Ruby SDK .

We've added the ability to group by API key on the Usage and Cost pages of the Developer Console .

We've added two new Last used at and Cost columns and the ability to sort by any column on the API keys page of the Developer Console .

We've retired the Claude 1 and Instant models. Read more in Model deprecations .

Claude Haiku 3.5 is now available on the Claude API as a text-only model.

We've added PDF support for use with the new Claude Sonnet 3.5. Read more in PDF support .

We've also added token counting, which allows you to determine the total number of tokens in a Message prior to sending it to Claude. Read more in Token counting .

The Message Batches API is now available in beta. Process large batches of queries asynchronously in the Claude API for 50% less cost. Read more in Batch processing .

We've loosened restrictions on the ordering of user / assistant turns in our Messages API. Consecutive user / assistant messages will be combined into a single message instead of erroring, and we no longer require the first input message to be a user message.

We've added the ability to disable parallel tool use in the API. Set disable_parallel_tool_use: true in the tool_choice field to ensure that Claude uses at most one tool. Read more in Parallel tool use .

We announced the deprecation of the Claude 1 models. Read more in Model deprecations .

Automatically generate test cases for your prompts using Claude in the Developer Console .

Compare the outputs from different prompts side by side in the new output comparison mode in the Developer Console .

We launched a beta version of the Ruby SDK .

We've added the ability to group by API key on the Usage and Cost pages of the Developer Console .

We've added two new Last used at and Cost columns and the ability to sort by any column on the API keys page of the Developer Console .

We've retired the Claude 1 and Instant models. Read more in Model deprecations .

Claude Haiku 3.5 is now available on the Claude API as a text-only model.

We've added PDF support for use with the new Claude Sonnet 3.5. Read more in PDF support .

We've also added token counting, which allows you to determine the total number of tokens in a Message prior to sending it to Claude. Read more in Token counting .

The Message Batches API is now available in beta. Process large batches of queries asynchronously in the Claude API for 50% less cost. Read more in Batch processing .

We've loosened restrictions on the ordering of user / assistant turns in our Messages API. Consecutive user / assistant messages will be combined into a single message instead of erroring, and we no longer require the first input message to be a user message.

We've added the ability to disable parallel tool use in the API. Set disable_parallel_tool_use: true in the tool_choice field to ensure that Claude uses at most one tool. Read more in Parallel tool use .

We announced the deprecation of the Claude 1 models. Read more in Model deprecations .

Automatically generate test cases for your prompts using Claude in the Developer Console .

Compare the outputs from different prompts side by side in the new output comparison mode in the Developer Console .

We launched a beta version of the Ruby SDK .

We've added the ability to group by API key on the Usage and Cost pages of the Developer Console .

We've added two new Last used at and Cost columns and the ability to sort by any column on the API keys page of the Developer Console .

We've retired the Claude 1 and Instant models. Read more in Model deprecations .

Claude Haiku 3.5 is now available on the Claude API as a text-only model.

We've added PDF support for use with the new Claude Sonnet 3.5. Read more in PDF support .

We've also added token counting, which allows you to determine the total number of tokens in a Message prior to sending it to Claude. Read more in Token counting .

The Message Batches API is now available in beta. Process large batches of queries asynchronously in the Claude API for 50% less cost. Read more in Batch processing .

We've loosened restrictions on the ordering of user / assistant turns in our Messages API. Consecutive user / assistant messages will be combined into a single message instead of erroring, and we no longer require the first input message to be a user message.

We've added the ability to disable parallel tool use in the API. Set disable_parallel_tool_use: true in the tool_choice field to ensure that Claude uses at most one tool. Read more in Parallel tool use .

We announced the deprecation of the Claude 1 models. Read more in Model deprecations .

Automatically generate test cases for your prompts using Claude in the Developer Console .

Compare the outputs from different prompts side by side in the new output comparison mode in the Developer Console .

The Messages API can now compact a conversation on demand on the Claude API, in beta with the compact-2026-09-04 beta header. Send the top-level compaction parameter, and the API returns a signed compaction block that summarizes the messages you sent. On later requests, send that block first, in place of those messages. You choose when to compact, the request can run in the background, and you can keep recent turns word for word after the summary. On models with preserved thinking, the thinking in those kept turns can stay valid.

We launched a beta version of the Ruby SDK .

We've added the ability to group by API key on the Usage and Cost pages of the Developer Console .

We've added two new Last used at and Cost columns and the ability to sort by any column on the API keys page of the Developer Console .

We've retired the Claude 1 and Instant models. Read more in Model deprecations .

Claude Haiku 3.5 is now available on the Claude API as a text-only model.

We've added PDF support for use with the new Claude Sonnet 3.5. Read more in PDF support .

We've also added token counting, which allows you to determine the total number of tokens in a Message prior to sending it to Claude. Read more in Token counting .

The Message Batches API is now available in beta. Process large batches of queries asynchronously in the Claude API for 50% less cost. Read more in Batch processing .

We've loosened restrictions on the ordering of user / assistant turns in our Messages API. Consecutive user / assistant messages will be combined into a single message instead of erroring, and we no longer require the first input message to be a user message.

We've added the ability to disable parallel tool use in the API. Set disable_parallel_tool_use: true in the tool_choice field to ensure that Claude uses at most one tool. Read more in Parallel tool use .

We announced the deprecation of the Claude 1 models. Read more in Model deprecations .

Automatically generate test cases for your prompts using Claude in the Developer Console .

Compare the outputs from different prompts side by side in the new output comparison mode in the Developer Console .

We launched a beta version of the Ruby SDK .

We've added the ability to group by API key on the Usage and Cost pages of the Developer Console .

We've added two new Last used at and Cost columns and the ability to sort by any column on the API keys page of the Developer Console .

We've retired the Claude 1 and Instant models. Read more in Model deprecations .

Claude Haiku 3.5 is now available on the Claude API as a text-only model.

We've added PDF support for use with the new Claude Sonnet 3.5. Read more in PDF support .

We've also added token counting, which allows you to determine the total number of tokens in a Message prior to sending it to Claude. Read more in Token counting .

The Message Batches API is now available in beta. Process large batches of queries asynchronously in the Claude API for 50% less cost. Read more in Batch processing .

We've loosened restrictions on the ordering of user / assistant turns in our Messages API. Consecutive user / assistant messages will be combined into a single message instead of erroring, and we no longer require the first input message to be a user message.

We've added the ability to disable parallel tool use in the API. Set disable_parallel_tool_use: true in the tool_choice field to ensure that Claude uses at most one tool. Read more in Parallel tool use .

We announced the deprecation of the Claude 1 models. Read more in Model deprecations .

Automatically generate test cases for your prompts using Claude in the Developer Console .

Compare the outputs from different prompts side by side in the new output comparison mode in the Developer Console .

We launched a beta version of the Ruby SDK .

We've added the ability to group by API key on the Usage and Cost pages of the Developer Console .

We've added two new Last used at and Cost columns and the ability to sort by any column on the API keys page of the Developer Console .

We've retired the Claude 1 and Instant models. Read more in Model deprecations .

Claude Haiku 3.5 is now available on the Claude API as a text-only model.

We've added PDF support for use with the new Claude Sonnet 3.5. Read more in PDF support .

We've also added token counting, which allows you to determine the total number of tokens in a Message prior to sending it to Claude. Read more in Token counting .

The Message Batches API is now available in beta. Process large batches of queries asynchronously in the Claude API for 50% less cost. Read more in Batch processing .

We've loosened restrictions on the ordering of user / assistant turns in our Messages API. Consecutive user / assistant messages will be combined into a single message instead of erroring, and we no longer require the first input message to be a user message.

We've added the ability to disable parallel tool use in the API. Set disable_parallel_tool_use: true in the tool_choice field to ensure that Claude uses at most one tool. Read more in Parallel tool use .

We announced the deprecation of the Claude 1 models. Read more in Model deprecations .

Automatically generate test cases for your prompts using Claude in the Developer Console .

Compare the outputs from different prompts side by side in the new output comparison mode in the Developer Console .

We launched a beta version of the Ruby SDK .

We've added the ability to group by API key on the Usage and Cost pages of the Developer Console .

We've added two new Last used at and Cost columns and the ability to sort by any column on the API keys page of the Developer Console .

Claude Haiku 3.5 is now available on the Claude API as a text-only model.

We've added PDF support for use with the new Claude Sonnet 3.5. Read more in PDF support .

We've also added token counting, which allows you to determine the total number of tokens in a Message prior to sending it to Claude. Read more in Token counting .

The Message Batches API is now available in beta. Process large batches of queries asynchronously in the Claude API for 50% less cost. Read more in Batch processing .

We've loosened restrictions on the ordering of user / assistant turns in our Messages API. Consecutive user / assistant messages will be combined into a single message instead of erroring, and we no longer require the first input message to be a user message.

We've added the ability to disable parallel tool use in the API. Set disable_parallel_tool_use: true in the tool_choice field to ensure that Claude uses at most one tool. Read more in Parallel tool use .

We announced the deprecation of the Claude 1 models. Read more in Model deprecations .

Automatically generate test cases for your prompts using Claude in the Developer Console .

Compare the outputs from different prompts side by side in the new output comparison mode in the Developer Console .

We've retired the Claude 1 and Instant models. Read more in Model deprecations .

The ant CLI adds ant beta:sessions connect , which attaches your terminal to a Claude Managed Agents session. You can follow the session live, send messages, and allow or deny tool calls that are waiting for approval. Pass --web to serve the Claude Console's session viewer locally and open the session there instead. See Connect to a Managed Agents session from your terminal .

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. agent.tool_use and agent.mcp_tool_use events report how each call was evaluated in an evaluation field alongside evaluated_permission . See Let the server evaluate each call with auto .

The ant CLI adds ant beta:sessions connect , which attaches your terminal to a Claude Managed Agents session. You can follow the session live, send messages, and allow or deny tool calls that are waiting for approval. Pass --web to serve the Claude Console's session viewer locally and open the session there instead. See Connect to a Managed Agents session from your terminal .

Version 1.32.0 of the ant CLI adds ant beta:sessions connect , which attaches your terminal to a Claude Managed Agents session. You can follow the session live, send messages, and allow or deny tool calls that are waiting for approval. Pass --web to serve the Claude Console's session viewer locally and open the session there instead. See Connect to a Managed Agents session from your terminal .

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. agent.tool_use and agent.mcp_tool_use events report how each call was evaluated in an evaluation field alongside evaluated_permission . See Let the server evaluate each call with auto .

Version 1.32.0 of the ant CLI adds ant beta:sessions connect , which attaches your terminal to a Claude Managed Agents session. You can follow the session live, send messages, and allow or deny tool calls that are waiting for approval. Pass --web to serve the Claude Console's session viewer locally and open the session there instead. See Connect to a Managed Agents session from your terminal .

We launched a beta version of the Ruby SDK .

We've added the ability to group by API key on the Usage and Cost pages of the Developer Console .

We've added two new Last used at and Cost columns and the ability to sort by any column on the API keys page of the Developer Console .

We've retired the Claude 1 and Instant models. Read more in Model deprecations .

We've added PDF support for use with the new Claude Sonnet 3.5. Read more in PDF support .

We've also added token counting, which allows you to determine the total number of tokens in a Message prior to sending it to Claude. Read more in Token counting .

The Message Batches API is now available in beta. Process large batches of queries asynchronously in the Claude API for 50% less cost. Read more in Batch processing .

We've loosened restrictions on the ordering of user / assistant turns in our Messages API. Consecutive user / assistant messages will be combined into a single message instead of erroring, and we no longer require the first input message to be a user message.

We've added the ability to disable parallel tool use in the API. Set disable_parallel_tool_use: true in the tool_choice field to ensure that Claude uses at most one tool. Read more in Parallel tool use .

We announced the deprecation of the Claude 1 models. Read more in Model deprecations .

Automatically generate test cases for your prompts using Claude in the Developer Console .

Compare the outputs from different prompts side by side in the new output comparison mode in the Developer Console .

Claude Haiku 3.5 is now available on the Claude API as a text-only model.

We launched a beta version of the Ruby SDK .

We've added the ability to group by API key on the Usage and Cost pages of the Developer Console .

We've added two new Last used at and Cost columns and the ability to sort by any column on the API keys page of the Developer Console .

We've retired the Claude 1 and Instant models. Read more in Model deprecations .

We've added PDF support for use with the new Claude Sonnet 3.5. Read more in PDF support .

We've also added token counting, which allows you to determine the total number of tokens in a Message prior to sending it to Claude. Read more in Token counting .

The Message Batches API is now available in beta. Process large batches of queries asynchronously in the Claude API for 50% less cost. Read more in Batch processing .

We've loosened restrictions on the ordering of user / assistant turns in our Messages API. Consecutive user / assistant messages will be combined into a single message instead of erroring, and we no longer require the first input message to be a user message.

We've added the ability to disable parallel tool use in the API. Set disable_parallel_tool_use: true in the tool_choice field to ensure that Claude uses at most one tool. Read more in Parallel tool use .

We announced the deprecation of the Claude 1 models. Read more in Model deprecations .

Automatically generate test cases for your prompts using Claude in the Developer Console .

Compare the outputs from different prompts side by side in the new output comparison mode in the Developer Console .

Claude Haiku 3.5 is now available on the Claude API as a text-only model.

We launched a beta version of the Ruby SDK .

We've added the ability to group by API key on the Usage and Cost pages of the Developer Console .

We've added two new Last used at and Cost columns and the ability to sort by any column on the API keys page of the Developer Console .

We've retired the Claude 1 and Instant models. Read more in Model deprecations .

We've added PDF support for use with the new Claude Sonnet 3.5. Read more in PDF support .

We've also added token counting, which allows you to determine the total number of tokens in a Message prior to sending it to Claude. Read more in Token counting .

The Message Batches API is now available in beta. Process large batches of queries asynchronously in the Claude API for 50% less cost. Read more in Batch processing .

We've loosened restrictions on the ordering of user / assistant turns in our Messages API. Consecutive user / assistant messages will be combined into a single message instead of erroring, and we no longer require the first input message to be a user message.

We've added the ability to disable parallel tool use in the API. Set disable_parallel_tool_use: true in the tool_choice field to ensure that Claude uses at most one tool. Read more in Parallel tool use .