AI / Claude Models Basics Interview Questions
What is Claude Haiku 4.5 and what are its key characteristics?
Claude Haiku 4.5 (claude-haiku-4-5-20251001, alias claude-haiku-4-5) is Anthropic's fastest and most cost-efficient model in the current generation. It is described as achieving near-frontier performance on coding, computer use, and agent tasks while being optimised for speed and low latency.
| Property | Value |
|---|---|
| API ID | claude-haiku-4-5-20251001 (alias: claude-haiku-4-5) |
| Context window | 200,000 tokens |
| Max output tokens | 64,000 tokens |
| Pricing (input) | $1 per million tokens |
| Pricing (output) | $5 per million tokens |
| Thinking | Extended thinking (opt-in, explicit reasoning blocks) |
| Context awareness | Yes — tracks its token budget throughout a conversation |
| Best for | High-throughput, latency-sensitive tasks; customer service; simple classification |
Extended thinking on Haiku 4.5: unlike the Opus and Sonnet tier which use adaptive thinking, Haiku 4.5 supports the explicit extended thinking mode where reasoning steps appear as visible <thinking> blocks in the API response. This is opt-in via the thinking parameter.
Haiku 4.5 was announced as matching Sonnet 4's performance on coding, computer use, and agent tasks while costing significantly less per token.
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