Claude Sonnet 4.6

Claims and evidence

• Released 17 February 2026 ● Primary source[1] [2]Availability: Released

• Status Available ● Primary source[2]Availability [3]Model status table

• Successor of Claude Sonnet 4.5 ● Primary source[1]computer use section

• Change · Reasoning Adds support for adaptive thinking alongside extended thinking.Compared with Claude Sonnet 4.5 ● Primary source[1]
• Change · Availability Became the default model for Free and Pro plans on claude.ai and in Claude Cowork.Compared with Claude Sonnet 4.5 ● Primary source[1]
• Change · Safety Anthropic reports improved resistance to prompt injection compared with Sonnet 4.5.Compared with Claude Sonnet 4.5 ● Primary source[1]

• Input text, image ● Primary source[2]Capabilities: Input and output
• Output text ● Primary source[2]Capabilities: Input and output
• Context window 1M tokensThe launch announcement offered the 1M token context window in beta; the model page lists 1M tokens. ● Primary source[2]Capabilities: Context window
• Parameters Not disclosedNot disclosed by Anthropic. No claim madeNo source
• Access API, consumer app, cloud partner ● Primary source[1]availability paragraph

Lineage

Variants

No variants recorded in this record.

Related AI Radar coverage

• Gender Bias Study: Anthropic’s Claude Sonnet 4.6 And OpenAI’s GPT-5.5 Say It’s OK To Abuse A Man But Not A Woman To Prevent Nuclear Apocalypse, While DeepSeek’s V4-Flash Shows No Such BiasDeepSeek · wccftech.com · 1 October 2026

All model releases from Anthropic on AI Radar →