Anthropic launches Claude Haiku 5.5

What changed

Anthropic launched Claude Haiku 5.5 (claude-haiku-5-5) for high-volume and latency-sensitive work. The model features a 1M token context window, 128k max output tokens, and adaptive thinking with the effort parameter. Code written for Claude Haiku 4.5 can break on Claude Haiku 5.5, because manual extended thinking returns a 400 error and adaptive thinking is enabled by default.

What it means for Zabio customers

Zabio offers some Anthropic models, but Claude Haiku 5.5 and Claude Haiku 4.5 are not in the Zabio catalog.

What Zabio does

Catalog change under review. Not in the Zabio catalog yet: claude-haiku-5-5.

Source

We’ve launched Claude Haiku 5.5 (claude-haiku-5-5), our most capable model tuned for high-volume and latency-sensitive work. It has a 1M token context window, 128k max output tokens, and adaptive thinking with the effort parameter.

Original announcement: Claude Platform release notes

Published automatically from the official announcement, minutes after it appeared. Reviewed by a person within the day.