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Claude Haiku 4.5

Available · Language, Multimodal, Reasoning

Claude Haiku 4.5 is a language model in Anthropic's Haiku line of small, fast models that accepts text and images, with a 200K-token context window and an extended thinking mode. It is offered in the Claude apps, Claude Code, on the Anthropic API, Amazon Bedrock and Google Cloud Vertex AI, and Anthropic presents it as a drop-in replacement for Claude 3.5 Haiku and Claude Sonnet 4. [1] [2]Capabilities [3] Primary source

Timeline of Claude Haiku 4.5 →

Claims and evidence

  • Released Primary source[3] [4]October 15, 2025 [2]Availability
  • Status AvailableListed as active; Anthropic commits to retirement not sooner than 2026-10-15. Primary source[5]Compare models [2]Availability [6]Model status
  • Change · Reasoning Adds an extended thinking mode, a first for the Haiku line; the system card notes that Claude 3.5 Haiku had none.Compared with Claude 3.5 Haiku Primary source[1]section 1.1.2 [2]Capabilities
  • Change · Other Trained to keep track of how much of its context window it has used; the window was 200K tokens at release.Compared with Claude 3.5 Haiku Primary source[1]
  • Input text, image Primary source[2]Capabilities [7]Claude Haiku 4.5 Summary Table, Modalities
  • Output text Primary source[2]Capabilities
  • Feature Reasoning mode Primary source[2]Capabilities [1]section 1.1.2
  • Context window 200K tokens Primary source[2]Capabilities [1]section 1.1.3
  • Parameters Not disclosedNot disclosed by Anthropic. No claim madeNo source
  • Access consumer app, API, cloud partner Primary source[3]

Lineage

Predecessors

Successors

No known successor.

Based on

Not derived from another model.

Variants and derived

None recorded.

Siblings

None recorded.

All ancestors

All descendants

None.

Variants

No variants recorded in this record.

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