{"type":"raw_signal","id":"introducing-claude-sonnet-5-5-the-second-model-abbfb3","slug":"introducing-claude-sonnet-5-5-the-second-model-abbfb3","title":"Introducing Claude Sonnet 5.5, the second model in the Claude 5.5 family.","description":"Anthropic announced Claude Sonnet 5.5 on September 28, 2026, describing it as the second model in the Claude 5.5 family and saying it is available today.","retrieval_nugget":"Anthropic announced Claude Sonnet 5.5 on September 28, 2026, describing it as the second model in the Claude 5.5 family and saying it is available today.","observed_at":"2026-09-28","record_date":"2026-09-28","date_kind":"observed_at","why_it_matters":"Anthropic reports that Sonnet 5.5 generates outputs more than 30% faster than Sonnet 5 and retains the same listed token prices: $2 per million input tokens and $10 per million output tokens. It says the model typically uses fewer tokens and can cost up to 30% less per task. The company also reports a 70.6% score on Terminal-Bench 4.0, compared with 10.3% for Sonnet 5. These are vendor-reported fi","novelty":"notable","verification_level":"source-linked","signal_type":"release","source_platform":"anthropic.com","topics":["claude","anthropic"],"entities":[],"related_patterns":[],"source_url":"https://www.anthropic.com/claude-sonnet-5-5","source_urls":["https://www.anthropic.com/claude-sonnet-5-5"],"schema_version":"newruntime-agent-readable-v0.2","stable_id":"signal:introducing-claude-sonnet-5-5-the-second-model-abbfb3","status":"published","visuals":[],"editor":{"role":"editor","name":"Andrey Reshetnikov","profile":"https://newruntime.com/owner-profile.md","profile_json":"https://newruntime.com/owner-profile.json","same_as":["https://www.linkedin.com/in/reshetnikov1/","https://t.me/lapetuse"]},"routes":{"html":"https://newruntime.com/signals/introducing-claude-sonnet-5-5-the-second-model-abbfb3/","markdown":"https://newruntime.com/signals/introducing-claude-sonnet-5-5-the-second-model-abbfb3.md","json":"https://newruntime.com/signals/introducing-claude-sonnet-5-5-the-second-model-abbfb3.json"},"next_reads":[{"type":"topic","path":"/topics/claude/","url":"https://newruntime.com/topics/claude/","title":"Claude","reason":"Explore the claude topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/claude.md","json_url":"https://newruntime.com/topics/claude.json"},{"type":"topic","path":"/topics/anthropic/","url":"https://newruntime.com/topics/anthropic/","title":"Anthropic","reason":"Explore the anthropic topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/anthropic.md","json_url":"https://newruntime.com/topics/anthropic.json"},{"type":"collection","path":"/signals/","url":"https://newruntime.com/signals/","title":"Raw Signals","reason":"Open every source-linked raw signal.","media_type":"text/html","json_url":"https://newruntime.com/signals.json"},{"type":"collection","path":"/source-ledger.json","url":"https://newruntime.com/source-ledger.json","title":"Source Ledger","reason":"Inspect the public source evidence graph.","media_type":"application/json"}]}