Mid-conversation tool changes enter beta on the Claude API

BetaJul 24, 2026VerifiedAdded Sep 22, 2026

Add or remove tools between turns while preserving the prompt cache on Claude Fable 5, Mythos 5, Opus 4.8 and Opus 5, using the mid-conversation-tool-changes-2026-07-01 beta header.

LLMs

Read Anthropic's release notes

https://platform.claude.com/docs/en/release-notes/overview#july-24-2026

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

More Claude Platform releases

Claude PlatformJul 24, 2026

Claude Opus 5 launches with a 1M token context window at $5 / $25 per MTok

Claude Opus 5 improves on Opus 4.8 with a 1M token context window, 128k max output and thinking on by default, at the same $5 / $25 per MTok price. It is available on the Claude API, Bedrock, Google Cloud and Microsoft Foundry.

GALLMsPricingDeveloper toolsSource

Claude PlatformJul 24, 2026

Claude Opus 5 only allows disabling thinking at effort high or below

Disabling thinking with effort xhigh or max returns a 400 error on Claude Opus 5, a breaking change from Opus 4.8 that integrations should check before migrating.

UpdateLLMsSource

Claude PlatformJul 24, 2026

Effort is the primary control for Claude Opus 5

Claude Opus 5 supports the full effort ladder of low, medium, high, xhigh and max, with max intended for capability-critical work.

UpdateLLMsSource

Claude PlatformJul 24, 2026

Claude API fallbacks parameter adds a default mode for recommended fallbacks

The default mode applies Anthropic's recommended fallback models by refusal category. Server-side fallback is in beta and this mode requires the server-side-fallback-2026-07-01 header.

BetaDeveloper toolsSource

Claude PlatformJul 24, 2026

Fast mode removed for Claude Opus 4.7

Requests to claude-opus-4-7 with speed fast now return an error rather than falling back to standard speed. The model stays available at standard speed; migrate to Opus 5 or Opus 4.8 to keep fast mode.

DeprecationLLMsSource

Claude PlatformJul 22, 2026

Claude Managed Agents agents accept an effort level in model configuration

Pass effort inside the model object when creating a Claude Managed Agents agent to set its effort level.

UpdateAI agentsLLMsDeveloper toolsSource

Claude PlatformJul 22, 2026

Claude Managed Agents webhooks cover environment and memory store lifecycle

Four environment.* and three memory_store.* webhook event types let you react to environment and memory store lifecycle changes without polling.

UpdateAI agentsLLMsSource

Claude PlatformJul 22, 2026

Claude Managed Agents sessions can be seeded with initial events

POST /v1/sessions accepts initial_events with up to 50 user.message and user.define_outcome events, and a non-empty list starts the agent loop in the same call.

UpdateAI agentsLLMsSource

Also shipped on Jul 24, 2026

Snowflake Cortex CodeJul 24, 2026

Skill and plugin sharing in CoCo (Public Preview)

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PreviewObservabilityCoding agentsSource

Databricks Unity CatalogJul 24, 2026

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BetaGovernanceSource

Databricks Databricks Data Intelligence PlatformJul 24, 2026

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Databricks LakebaseJul 24, 2026

Diagnose and fix Lakebase issues with Genie, using telemetry in Unity Catalog (Beta)

Lakebase adds AI-assisted troubleshooting: database issues and early warnings are surfaced to you with Insights , and you can then investigate and fix them conversationally with Genie . Both draw on database telemetry captured to Unity Catalog. See Observability .

BetaGovernanceBIObservabilitySource

Google Cloud Dataplex Universal CatalogJul 24, 2026

Knowledge Catalog governance workflows for data product access in preview

Governance workflows add automated controls for data product access management through a request-review mechanism.

PreviewGovernanceSource

Vercel Vercel platformJul 24, 2026

Vercel WAF for Blob is now in beta

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BetaBIObservabilityDeveloper toolsSource