---
id: "2024-06-20-claude-3-5-sonnet"
url: "https://postcutoff.com/e/2024-06-20-claude-3-5-sonnet/"
as_of: "2026-11-13T13:49:00+01:00"
date: "2024-06-20"
date_precision: day
category: model-release
importance: 4
confidence: high
status: [Confirmed]
sources: 2
editor: human editor
human_review: null
version: "2026-10-04"
---

As of: 2026-11-13 13:49 CET.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/e/2024-06-20-claude-3-5-sonnet/

# Claude 3.5 Sonnet launches with Artifacts

Claude 3.5 Sonnet outperformed Claude 3 Opus at twice the speed and a fifth of the price, and quickly became developers' favorite coding model; claude.ai added Artifacts, a side panel for live code and documents.

## Key facts
- Released 20 June 2024
- Priced at $3 / $15 per million input/output tokens
- 200K context window
- Artifacts feature introduced in claude.ai
- An upgraded version released 22 October 2024 added computer use

## What happened

Anthropic's mid-tier model surpassed its previous flagship across reasoning, coding and vision evaluations.

## Why it matters

Established Claude as the leading coding model, driving adoption in tools like Cursor and paving the way for coding agents.

## Your AI and this story

- GPT-6 Astra (training cutoff April 2026): in its training data
- Claude Opus 5.5 (training cutoff June 2026): in its training data
- Gemini 4 Hydrogen (training cutoff March 2026): in its training data
- Grok 4.7 (training cutoff May 2026): in its training data

## Sources

1. [Introducing Claude 3.5 Sonnet (Anthropic)](https://www.anthropic.com/news/claude-3-5-sonnet) (anthropic.com, official)
2. [Wikipedia: Claude (language model)](https://en.wikipedia.org/wiki/Claude_(language_model)) (en.wikipedia.org, discussion)

## Changes

- 2026-09-29 (filed): Created

## Related

- 2024-10-22: [Anthropic releases computer use for Claude 3.5 Sonnet](https://postcutoff.com/e/2024-10-22-claude-computer-use/index.md)
- 2024-03-04: [Anthropic launches the Claude 3 family (Opus, Sonnet, Haiku)](https://postcutoff.com/e/2024-03-04-claude-3/index.md)