Unverified50% confidenceBenchmarkExact time
On the FrontierCode 1.1 benchmark, Sonnet 5.5 achieved notable improvement compared to its predecessor Sonnet 5.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
9/28/2026
First Seen
Valid until: 12/27/2026
Sources
Related Entities
Related Claims
UnverifiedSonnet 5 has switched to the tokenizer from Opus 4.7.74% similarUnverifiedSonnet 5.5 has been available on all platforms since its launch date and is immediately accessible to users72% similarUnverifiedClaude Sonnet 4 is positioned above the previous Opus series, with the company officially describing it as a new category within the Sonnet series.70% similarUnverifiedA 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 5.68% similarUnverifiedBedrock Agent Core uses the Sonnet 4.5 model by default in demonstrations.67% similar
Cite This Claim
Stable URI
https://kongchang.com/claim/957491API
curl https://kongchang.com/api/v1/knowledge/claims/957491MCP
get_claim(id=957491)