Claude Opus 5.5 launched, first model in the Claude 5.5 family
Tech · Releases · Tue, September 22, 2026
Anthropic launched Claude Opus 5.5, the first model in the Claude 5.5 family. It performs at the level of Claude Fable 5.1 on most work and costs 40% less to run than Opus 5.
Every year
| Date | Event | When |
|---|---|---|
| Tue, Jun 30, 2026 | Claude Sonnet 5 launched | 3 mo ago |
| Wed, Jul 1, 2026 | Model entitlements for Enterprise plans (beta) | 3 mo ago |
| Thu, Jul 9, 2026 | Monthly recap in Settings > Reflect (beta), plus break reminders and quiet hours | 3 mo ago |
| Fri, Jul 24, 2026 | Claude Opus 5 launched | 2 mo ago |
| Thu, Aug 6, 2026 | Skill and plugin security scanning (beta) for Enterprise plans | 2 mo ago |
| Tue, Sep 1, 2026 | Claude Fable 5.1 and Claude Mythos 5.1 launched | 24 days ago |
| Thu, Sep 10, 2026 | Smart reports (beta) on Claude Enterprise analyze team usage and costs | 15 days ago |
| Tue, Sep 15, 2026 | Salesforce in Claude plugin (beta) with 37 pre-built sales skills | 10 days ago |
| Tue, Sep 22, 2026 | Claude Opus 5.5 launched, first model in the Claude 5.5 family | 3 days ago |
Also on Sep 22, 2026
| Date | Event | When |
|---|---|---|
| Tue, Sep 22, 2026 | September equinox | 3 days ago |
| Tue, Sep 22, 2026 | Mabon | 3 days ago |
| Tue, Sep 22, 2026 | 2026 Billie Jean King Cup Finals | Now |
| Tue, Sep 22, 2026 | UN General Assembly general debate 2026 | Now |
| Tue, Sep 22, 2026 | 300th anniversary: Bach led the first performance of his cantata Wer Dank opfert, der preiset... | 3 days ago |
| Tue, Sep 22, 2026 | Snowflake World Tour Dallas 2026 | 3 days ago |
Source, method and history
- Source
- anthropic
- How we know
- From the Releases API (releases.fru.dev), which reads each vendor's changelog.
- Who
- anthropic
- Recurs
- one-off
- More on fru.dev
- releases.fru.dev
- Feed
- Subscribe to Releases
- Changes
- 2026-09-25: added to 2026-09-22