Unverified50% confidenceFactExact time
Computer use tools must be declared as the computer_toolset_20260801 toolset and no longer require a beta header; Sonnet 5.5 rejects computer_20250124 on all platforms, with Amazon Bedrock as an exception retaining computer_20251124.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
10/15/2026
First Seen
Valid until: 1/13/2027
Sources
Related Entities
Related Claims
Unverifiedv1.11.0 marks the deprecation of Sonnet 4.5 in the Chores (routine maintenance) section, meaning Sonnet 4.5-related configurations have been deprecated at the client level.70% similarUnverifiedWhen Sonnet 5.5 acts as the executor, the advisor must be Opus 5, Opus 5.5, Sonnet 5.5, Fable 5/5.1 or Mythos 5/5.1; using Opus 4.8/4.7/4.6, Sonnet 5, Sonnet 4.6 or Haiku 5.5 as the advisor returns a 400.64% similarUnverifiedLeaked specifications show that Sonnet 5.5 has a 1 million token context window, a maximum output of 128,000 tokens, adaptive thinking enabled by default, and removal of forced tool calls.64% similarUnverifiedVersion v1.9.0 added support for the claude-sonnet-5-5 model.61% similar
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