---
title: "Anthropic releases Claude Opus 5.5, then Sonnet and Haiku 5.5"
description: "Anthropic launched Claude Opus 5.5 on September 22, saying it is faster, writes more clearly and costs about 40% less to run than its previous top model."
author: Graham
date: 2026-09-22
url: https://powerofai.ca/news/2026-09-22-claude-5-5-models
---

# Anthropic releases Claude Opus 5.5, then Sonnet and Haiku 5.5

Anthropic launched Claude Opus 5.5 on September 22, saying it is faster, writes more clearly and costs about 40% less to run than its previous top model.

September 22, 2026 · Launch

Anthropic launched Claude Opus 5.5 on September 22, saying it is faster, writes more clearly and costs about 40% less to run than its previous top model. Sonnet 5.5 followed on September 28 and Haiku 5.5 on October 7.

**Why it matters to you:** Faster, cheaper models usually show up as better answers and higher usage limits in the apps people use.

Source: [Anthropic: Opus 5.5](https://www.anthropic.com/claude-opus-5-5), [Sonnet 5.5](https://www.anthropic.com/claude-sonnet-5-5), [Haiku 5.5](https://www.anthropic.com/claude-haiku-5-5)

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