Claude API input_transformations adds thinking_mismatch_allowed entries in beta

BetaSep 14, 2026VerifiedAdded Sep 22, 2026

Under the thinking-binding-controls-2026-08-01 beta header, input_transformations can report thinking_mismatch_allowed for thinking blocks that failed an unenforced prefix check. Logging these entries helps find conversation history edits in production traffic.

LLMs Observability Developer tools

Read Anthropic's release notes

https://platform.claude.com/docs/en/release-notes/overview#september-14-2026

Summaries of vendors' own notes. Product names and logos belong to their owners; logos via logo.dev.

More Claude Platform releases

Claude PlatformSep 14, 2026

Messages API adds on-demand conversation compaction in beta

With the compact-2026-09-04 beta header, the top-level compaction parameter returns a signed compaction block summarizing prior messages, which you send in their place on later requests. You choose when to compact, it can run in the background, and recent turns can be kept verbatim.

BetaLLMsDeveloper toolsSource

Claude PlatformSep 18, 2026

Compliance API adds Claude in Chrome session transcripts in beta

Compliance API local session endpoints now return transcripts of Claude in Chrome sessions (product_surface claude_in_chrome) for Claude Enterprise organizations, using the existing Compliance Access Key and read:compliance_user_data scope.

BetaLLMsGovernanceDeveloper toolsSource

Claude PlatformSep 10, 2026

Claude Managed Agents permission policies add an auto mode

A new auto permission policy lets the server evaluate each agent or MCP tool call and run it, deny it, or pause for approval. agent.tool_use and agent.mcp_tool_use events now report how each call was evaluated.

UpdateAI agentsLLMsMCPSource

Claude PlatformSep 10, 2026

ant CLI 1.32.0 adds sessions connect for live Managed Agents sessions

ant beta:sessions connect attaches a terminal to a Claude Managed Agents session so you can follow it live, send messages and approve or deny pending tool calls. --web serves the Console session viewer locally.

BetaAI agentsLLMsDeveloper toolsSource

Claude PlatformSep 22, 2026

Claude Opus 5.5 launches with a 1M token context window and 128k output

Anthropic released Claude Opus 5.5 for long-running agentic coding and knowledge work, with a default 1M token context, 128k max output and always-on adaptive thinking. It costs $4 / $20 per MTok, below Claude Opus 5, and is on the Claude API, Bedrock, Google Cloud and Microsoft Foundry.

GAAI agentsLLMsDeveloper toolsSource

Claude PlatformSep 22, 2026

Claude Opus 5.5 breaking changes: thinking can't be disabled, forced tool_choice removed

On Claude Opus 5.5, disabling or manually enabling thinking returns a 400; control depth with the effort parameter instead. tool_choice any and tool also return 400, so use auto with strict tool use, and computer use requires the computer_toolset_20260801 toolset.

UpdateLLMsDeveloper toolsSource

Claude PlatformSep 22, 2026

Fast mode research preview available for Claude Opus 5.5 on the Claude API

Fast mode, in research preview, can now be used with Claude Opus 5.5 on the Claude API.

PreviewLLMsDeveloper toolsSource

Claude PlatformSep 22, 2026

Claude API beta lets tools be defined inside mid-conversation system messages

With the inline-tools-2026-09-15 beta header, a tool_addition block can carry a full tool definition, so agents can add tools, change schemas or upgrade server tools mid-conversation without invalidating the prompt cache. The same header covers adding and removing tools by reference.

BetaLLMsMCPData integrationSource

Also shipped on Sep 14, 2026

Google Cloud BigQuerySep 14, 2026

Metadata for BigQuery Graph is automatically ingested and searchable in Knowledge Catalog

Metadata for BigQuery Graph is automatically ingested and searchable in Knowledge Catalog . This feature is available in preview .

PreviewSQLGovernanceData integrationSource

Google Cloud BigQuerySep 14, 2026

BigQuery supports WHERE clauses inside aggregate function calls in preview

Aggregate function calls can now include a WHERE clause that filters their input with a boolean expression, simplifying conditional aggregation in SQL.

PreviewDeveloper toolsSource

Snowflake Snowflake Cortex AISep 14, 2026

Multimodal AI_SUMMARIZE for automatic theme summarization (Public Preview)

Snowflake Cortex AI_SUMMARIZE is now available in public preview, enabling customers to summarize text and multimodal content, including images and documents, directly in Snowflake.

PreviewSQLData integrationSource

Snowflake SnowflakeSep 14, 2026

Zero-copy support for all table formats in interactive warehouses (General availability)

Support for all table formats in interactive warehouses is now generally available and is no longer in Preview .

GASQLSource

Databricks AI/BI and GenieSep 14, 2026

Genie visualizations in Slack replies (Public Preview)

When a Genie response includes a chart, the visualization now appears as an image in the Slack reply. If you installed the Databricks Genie app for Slack previously, reinstall it to enable this. See Visualizations .

PreviewBISource

Google Cloud Dataplex Universal CatalogSep 14, 2026

Metadata for BigQuery Graph is now automatically ingested and searchable in Knowledge Catalog

Metadata for BigQuery Graph is now automatically ingested and searchable in Knowledge Catalog. This feature is available in preview . For more information, see Knowledge Catalog overview .

PreviewSQLGovernanceData integrationSource