Claude Haiku 4.5
Anthropic's fastest, most affordable AI model that delivers near-frontier coding performance at one-third the cost of premium models.
What is Claude Haiku 4.5?
Claude Haiku 4.5 is Anthropic's smallest, fastest AI model that punches way above its weight class.
It matches the coding performance of Claude Sonnet 4 (which was state-of-the-art five months ago) but runs twice as fast and costs just $1 per million input tokens versus $3 for Sonnet.
Most builders use it for high-volume tasks like customer support bots, rapid prototyping, or orchestrating multiple AI agents in parallel. It's the first Haiku model with extended thinking, computer use, and context awareness built in.
Scores 73.3% on SWE-bench Verified (real GitHub coding tasks). Available through Claude.ai or the API at $1/$5 per million input/output tokens.
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Related Terms
A trained algorithm that takes inputs (text, images, data) and produces outputs (predictions, classifications, generated content).
AI agents that autonomously plan, write, test, and refactor code with minimal human prompting, handling entire workflows instead of single tasks.
Anthropic's command-line AI assistant that lives in your terminal, reads your codebase, and writes code across multiple files.
The text instruction you give an AI model to tell it what you want it to do, like asking ChatGPT to write code or explain a concept.
The practice of crafting specific instructions to get better outputs from AI models like ChatGPT, Claude, or Gemini.
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