Claude Haiku 4.5 (batch)

Claude Haiku 4.5 in batch mode is Anthropic's fastest and most cost-efficient model, designed for asynchronous processing with a 200k-token context window.

Strengths

Delivers near-frontier reasoning performance at the lowest latency and cost among Claude models, matching Sonnet-tier intelligence in many tasks.

Best for

High-volume, time-insensitive workloads where speed and efficiency matter more than extended reasoning, such as classification, summarization, and straightforward question-answering at scale.

Limitations

The 200k-token context window is smaller than Opus or Sonnet, and batch processing introduces latency unsuitable for real-time applications; newer Sonnet and Opus releases have expanded capabilities that Haiku does not match on complex reasoning tasks.