Unverified50% confidenceFactExact time
Sonnet 5.5 has been available on all platforms since its launch date and is immediately accessible to users
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
9/28/2026
First Seen
Valid until: 12/27/2026
Sources
Related Entities
Related Claims
UnverifiedA similar Sonnet 5 leak (codenamed Phoenix) appeared in February of this year, but the model that was ultimately officially released was Sonnet 4.6, not Sonnet 5.70% similarUnverifiedSonnet 5 has switched to the tokenizer from Opus 4.7.70% similarUnverifiedAnthropic stated that Sonnet 5.5 and Haiku 5.5 are coming soon.70% similarUnverifiedBedrock Agent Core uses the Sonnet 4.5 model by default in demonstrations.67% 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.63% similar
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