ModelClock
Release announced
Released on Sep 28, 2026
Impossibl announced this model on 2026-09-28. joins the ai api.
- Hosting route
- Impossibl platform
- Affected scope
- joins the ai api
- Announced
- Sep 28, 2026
- First seen by ModelClock
- Oct 4, 2026
What the provider published
impossibl.com ↗anthropic/claude-sonnet-5-5
new model
claude sonnet 5.5 joins the ai api. it is anthropic's successor to sonnet 5 for everyday coding and writing work.
Read from the provider's text; the quote is the provider's exact lines.