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Claude Sonnet 4.5

Anthropic · Claude Sonnet line · lightweight

Released September 29, 2025Replaced by Claude Sonnet 4.6

What changed

No verified summary yet. We only publish what the maker's own numbers support, so this card fills in as the sources come in.

Where the Claude Sonnet line stands

Claude Sonnet 5 is the current model in this line. The card shows how long it has been since the last release against the line's usual gap and its recent ones — the rhythm, not a date.

Claude Sonnet 5

Anthropic · Claude Sonnet line · lightweight
Mid-cycle71 of ~133 days into its usual cycle

Replaced Sonnet 4.6 as the default model on Anthropic's Free and Pro plans, priced at $2 per million input tokens and $10 per million output tokens.

Released Jun 30, 2026 · what changed →
Days since last release
Claude Sonnet 5 · Jun 30, 2026
71
days
Usual gap
133
days
Recent gaps
Claude Sonnet 5 · Jun 2026
133
Claude Sonnet 4.6 · Feb 2026
141
Claude Sonnet 4.5 · Sep 2025
130
Claude Sonnet 4 · May 2025
86

Every Claude Sonnet release

Newest first. See the full line with every card →

  1. Jun 30, 2026Claude Sonnet 5
  2. Feb 17, 2026Claude Sonnet 4.6
  3. Sep 29, 2025Claude Sonnet 4.5 · this page
  4. May 22, 2025Claude Sonnet 4
  5. Feb 25, 2025Claude 3.7 Sonnet
  6. Jun 20, 2024Claude 3.5 Sonnet
  7. Mar 4, 2024Claude 3 Sonnet

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