←── back to digests
/digest/2026-09-29
tuesday, september 29, 2026
top 7 trending●previous 24h●generated 39d ago
Anthropic released Claude Sonnet 5.5, a mid-tier model positioned between Sonnet 5 and Opus 5.5 that delivers faster code review performance with more bug catches than its predecessor while scoring near Opus 5.5 on the Artificial Analysis Intelligence Index. The release includes pricing and tuning guidance, with users noting a widening capability gap between closed and open-source models.
- Sonnet 5.5 catches more code defects than Sonnet 5 in half the execution time
- Scores just behind Opus 5.5 on Artificial Analysis Intelligence Index benchmark
- Anthropic published System Card and pricing/tuning guidance for model selection
- Closed-source models like Sonnet 5.5 and Opus 5.5 now show agentic capabilities absent in open alternatives
- Released September 28, 2026