Coverage of Anthropic's September 22, 2026 release, including availability, operating costs, evaluation methods and safeguards.
Anthropic binds retained thinking to the instructions, tools and messages that preceded it. Integrations that rewrite earlier context can encounter a 400 error even when thinking blocks themselves are intact.
Anthropic's documentation separates classifier refusals from overload and rate limits, and identifies the serving model and per-attempt usage needed to audit a fallback.
Anthropic's discounted batch service requires teams to reconcile individual outcomes and retrieve results within 29 days of creation, even when processing finishes later.
Bedrock and Claude Platform on AWS expose different service experiences.
