# Claude Opus 5\.5, the first model in our new Claude 5\.5 family

[Reference page](https://posts.design/claude-opus-5-5-the-first-model-in-2026-09-22) · [Markdown](https://posts.design/claude-opus-5-5-the-first-model-in-2026-09-22.md) · [Original source](https://x.com/claudeai/status/2102435511222890900)

Introducing Claude Opus 5\.5, the first model in our new Claude 5\.5 family\.

It performs at the level of Claude Fable 5\.1 for most tasks, and costs 40% less to run than Opus 5\.

- Kind: post
- Media: video
- Posting account: Claude · @claudeai
- Account: [claudeai](https://x.com/claudeai)
- Represented brand: Claude
- Categories: Launch
- Subjects: AI
- Source published: 2026\-09\-22T16:31:01\.000Z
- Captured: 2026\-09\-22
- Added to posts.design: 2026\-09\-22T16:54:52\.505Z
- Recorded views: 28147212 · captured 2026\-10\-12T15:54:33\.032Z · refresh\-observed\-public

![Claude Opus 5\.5, the first model in our new Claude 5\.5 family — public x\-twitter post media curated for social post design inspiration\.](https://posts.design/images/posts/x-twitter-claudeai-2102435511222890900-claude-opus-5-5-first-model-image-4f7c46acd768820c0b30bc4bee1c7b7cbe248c18bfd715db8b366f12b8f7dd15.webp)

1280 × 720

Watch the video on its [reference page](https://posts.design/claude-opus-5-5-the-first-model-in-2026-09-22). See the [agent guide](https://posts.design/llms.txt) for available member tools.

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