Release date: 2026-09-22. This update is based on the vendor’s announcement and was added to the Worksflow.ai guide on October 11, 2026.
Anthropic announced Claude Opus 5.5 on September 22, 2026 as the first model in its 5.5 family. The company positions it for complex work and reports improvements in coding, software changes, and alignment evaluations compared with Opus 5.
What the update means
The announcement includes Anthropic’s own benchmark and safety results and describes safeguards for higher-risk capabilities. Teams should review the linked system card and model availability, then test their own prompts, tools, and escalation paths instead of treating headline results as independent validation.
What to verify before you update a workflow
- Confirm the exact model or product identifier in the vendor’s live documentation.
- Check whether the announcement describes a general release, preview, or restricted rollout.
- Test the same representative tasks, tool calls, and failure cases used in your current workflow.
- Record the vendor’s source and the date your team checked it.
Official sources
Details and availability can change after publication. Recheck the source before acting on this guide.