guideclaude haiku apiclaude haiku 4.5cheapest claudeanthropic apifast llmClaude Haiku API Guide: Cheapest Claude at $1/$5 per MillionA practical Claude Haiku 4.5 API guide — Anthropic's fastest, cheapest model at $1/$5 per million tokens. When Haiku is enough, and when to escalate to Sonnet or Opus.2026-07-10claire-lowe
