Reasoning Models & the AGI Debate AnthropicSep 29, 2025

Anthropic releases Claude Sonnet 4.5

Claude Sonnet 4.5 released — OSWorld 61.4% and SWE-bench Verified 77.2% (company-reported), with pricing unchanged at $3/$15 per 1M tokens

Why it matters

Anthropic said it observed the model maintaining focus for more than 30 hours on complex multi-step tasks; released under ASL-3 protections together with the Claude Agent SDK

Source — Primary sources first; secondary reports are labelled “Press”

Officialanthropic.comhttps://www.anthropic.com/news/claude-sonnet-4-5

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