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Claude Haiku 4.5
Anthropic's smallest Claude 4.5 model, released October 2025 and succeeded by Haiku 5.5 in October 2026. Sonnet 4-level coding at one-third the cost. $1/$5 per million tokens.
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Claude Haiku 4.5 is the Anthropic small model released in October 2025 and available through the Claude API as `claude-haiku-4-5`. Its successor, Claude Haiku 5.5, shipped on October 7, 2026. It delivers coding performance comparable to Claude Sonnet 4 at roughly a third of the cost, and runs up to 4-5x faster than Sonnet 4.5. It is the first Haiku model to ship with extended thinking, computer use, and context awareness, putting agent-grade capabilities into the cheapest tier of the Claude family. Pricing is $1 per million input tokens and $5 per million output tokens, making it the default choice for high-volume, latency-sensitive workloads and multi-agent swarms where cost per call compounds quickly. Available on the Claude API, Amazon Bedrock, and Vertex AI.
Claude Haiku 4.5 at a glance
Last verified
- Pricing
- Claude API - $1/MTok input, $5/MTok output
- Prompt caching - $1.25/MTok 5-minute cache write, $2/MTok 1-hour cache write, $0.10/MTok cache read
- Batch API - 50% discount on input and output
- Install
pip install anthropicnpm install @anthropic-ai/sdk- Models
- A single model, claude-haiku-4-5 (alias for the pinned snapshot claude-haiku-4-5-20251001), with a 200K context window, 64K max output and manual extended thinking via budget_tokens. It is also on Amazon Bedrock (anthropic.claude-haiku-4-5), Google Cloud (claude-haiku-4-5@20251001), Microsoft Foundry and Claude Platform on AWS.
- Recent changes
- Claude Haiku 5.5 is released as the current Haiku, with a 1M context window and pricing from $0.10/$0.50 per MTok; Haiku 4.5 moves to legacy status.
Sources: Claude Haiku 4.5 model page, Model deprecations, Claude Haiku 5.5 model page, Get started with Claude, anthropic-sdk-typescript README
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Get started with Claude Haiku 4.5
Anthropic's smallest Claude 4.5 model, released October 2025 and succeeded by Haiku 5.5 in October 2026. Sonnet 4-level coding at one-third the cost. $1/$5 per million tokens.
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