Model release · curated entry
Claude 4 strengthens long-horizon coding
Introducing Claude 4
- Date
- May 22, 2025
- Category
- Model release
- Organization / Model
- Anthropic
- Evidence
- 1 source · 1 evidence family
Anthropic released Claude Opus 4 and Sonnet 4 with better long-horizon coding and agentic task performance. Opus 4 was the first model publicly described as able to work for hours unattended.
Curator's note: Cross-checked against Anthropic's official announcement page.
Curated sources · 1
Cite this page
This page is a curated static snapshot and can be cited directly. Preferred format GB/T 7714—2025 (electronic resource [EB/OL]); the other 5 styles open below, together with the machine-readable files.
GB/T 7714—2025 (electronic resource [EB/OL])
AI 纪年. Claude 4 发布，长时程编码与智能体能力强化[EB/OL]. (2025-05-22)[2026-11-03]. https://aihist.net/e/claude-4-2025.html.
APA 7 · American Psychological Association
AI 纪年. (2025, May 22). Claude 4 发布，长时程编码与智能体能力强化 [Web page]. https://aihist.net/e/claude-4-2025.html
MLA 9 · Modern Language Association
"Claude 4 发布，长时程编码与智能体能力强化." AI 纪年, 22 May 2025, aihist.net/e/claude-4-2025.html. Accessed 3 Nov. 2026.
Chicago 17 · notes-bibliography
AI 纪年. "Claude 4 发布，长时程编码与智能体能力强化." Published May 22, 2025. Accessed Nov. 3, 2026. https://aihist.net/e/claude-4-2025.html.
IEEE · citation-reference list
"Claude 4 发布，长时程编码与智能体能力强化," AI 纪年, 22 May 2025. [Online]. Available: https://aihist.net/e/claude-4-2025.html. [Accessed: 3 Nov. 2026].
ACM · author-date variant
AI 纪年. May 22, 2025. Claude 4 发布，长时程编码与智能体能力强化. Retrieved November 3, 2026 from https://aihist.net/e/claude-4-2025.html.
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