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Claude Haiku 4.5

Anthropic · Claude Haiku line · lightweight

Released October 15, 2025Replaced by Claude Haiku 5.5

Claude Haiku 4.5 was released by Anthropic on October 15, 2025, as a lightweight model in the Claude Haiku line.

No detailed card for this model: we only add numbers published by the maker or by independent benchmarks. Sources: Anthropic

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Where the Claude Haiku line stands

Claude Haiku 5.5 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 Haiku

Anthropic · lightweight line

Latest: Claude Haiku 5.5 · Oct 7, 2026

Just released17 days since the last release · usual gap 345 days

Costs a tenth of Claude Haiku 4.5 for prompts under 100K tokens while raising its computer-use score from 15.7% to 72.4%, with a 1M-token context window.

What changed in Claude Haiku 5.5 →
Days since last release
17
days
Usual gap
345
days
Recent gaps
Claude Haiku 5.5 · Oct 2026
357
Claude Haiku 4.5 · Oct 2025
345
Claude 3.5 Haiku · Nov 2024
236

Every Claude Haiku release

Newest first. See the full line with every card →

  1. Oct 7, 2026Claude Haiku 5.5
  2. Oct 15, 2025Claude Haiku 4.5 · this page
  3. Nov 4, 2024Claude 3.5 Haiku
  4. Mar 13, 2024Claude 3 Haiku