Unverified50% confidenceFactExact time
Anthropic officially positions Sonnet 5.5 as an upgrade to Sonnet 5, with a 30% speed improvement and cost reductions of up to 30% for most workloads.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
10/1/2026
First Seen
Valid until: 12/30/2026
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 5.77% 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.73% similarUnverifiedOn the FrontierCode 1.1 benchmark, Sonnet 5.5 achieved notable improvement compared to its predecessor Sonnet 5.73% similarUnverifiedSonnet 5.5 is on par with Opus 5.5 in offensive and defensive cybersecurity capabilities, making it the first model in the Sonnet series to adopt equivalent cybersecurity protection mechanisms.73% similarVerifiedAnthropic stated that Sonnet 5.5 and Haiku 5.5 are coming soon.72% similar
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