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Reasoning Models & the AGI DebateAnthropic

Anthropic releases Claude Sonnet 4.5

Made by AIWritten by AI (Claude) from the source below. Check anything important against the source.How it's made

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

Added in Week 41, 2026 · See that week

On the map — ⑥ Reasoning Models line

  1. Previous stopAnthropic releases Claude Opus 4 and Claude Sonnet 4
  2. This recordClaude Sonnet 4.5
  3. Next stopClaude Haiku 4.5
See it on the map

In the model family tree — Claude family · 20 versions

  1. Earlier versionClaude Opus 4.1
  2. This recordClaude Sonnet 4.5
  3. Later versionClaude Haiku 4.5
See the whole Claude family

Related notes — Notes on the same axis from the same week

A report that used numbers obtained by asking models as evidence

Same week

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Nearby on the same axis

DeepSeek-R1 paper published in NaturePaperAnthropic releases Claude Haiku 4.5OfficialA Definition of AGIPaperRemote Labor IndexPaper