Anthropic Claude LLM Series

Anthropic Large Language Model series called “Claude”

Anthropic released several large language models under the Claude umbrella, with the latest Claude 5 generation (June–July 2026) providing frontier performance with adaptive thinking capabilities.

Claude 5 Generation (2026 Frontier)

Latest frontier models with adaptive thinking (always-on, configurable depth, 1M-token context)

Unrestricted Public Release

• Claude Fable 5 — Frontier, most capable, widely available (June 9, 2026)
• Claude Opus 5 — Near-frontier, enterprise-grade (July 24, 2026)
• Claude Sonnet 5 — Upper-mid-tier, most agentic Sonnet (June 30, 2026)

Limited Release (Project Glasswing)

• Claude Mythos 5 — Frontier without safety classifiers, authorized users only (June 9, 2026)

Opus Series (Older)

• Claude Opus 4
• Claude Opus 4.1
• Claude Opus 4.5
• Claude Opus 4.6
• Claude Opus 4.6 - Adaptive Reasoning

Sonnet Series (Older)

• Claude Sonnet 3.5
• Claude Sonnet 3.7
• Claude Sonnet 4
• Claude Sonnet 4.5
• Claude Sonnet 4.6

Haiku Series (Older)

• Claude Haiku 3.5
• Claude Haiku 4.5

Other Variants

• Claude 4
• claude-os