Claude Code v2.1.170: Claude Fable 5 Support Added
Anthropic
Claude Code v2.1.170 (June 9, 2026) adds support for the newly released Claude Fable 5 model. The preceding v2.1.169 (June 8) introduced a --safe-mode flag and /cd command; v2.1.166 (June 6) added fallbackModel configuration supporting up to three alternative models for resilience under API overload; v2.1.163 (June 4) introduced version requirement policies (requiredMinimumVersion/requiredMaximumVersion) and a /plugin list command.
Why it matters
Same-day Fable 5 support shows tight Anthropic tooling integration. The fallbackModel feature from v2.1.166 is the more durable improvement: enterprise teams can configure automatic failover across up to three models without user intervention.
Importance: 2/5
Patch release adding Fable 5 support; fallbackModel from earlier in the week is the substantive capability addition.