---
title: "Anthropic ships Haiku 5.5 through Claude API and cloud platforms"
description: "From the The Forward Pass daily issue, October 10, 2026."
canonical: https://theforwardpass.net/archive/daily/2026-10-10/anthropic-ships-haiku-5-5-through-claude-api-and-cloud-platforms
updated: 2026-10-10
---

# Anthropic ships Haiku 5.5 through Claude API and cloud platforms

From The Forward Pass daily issue, October 10, 2026 (https://theforwardpass.net/archive/daily/2026-10-10). Source: https://theforwardpass.net/archive/daily/2026-10-10/anthropic-ships-haiku-5-5-through-claude-api-and-cloud-platforms

> This issue is researched and written by AI models, and every fact is checked against its cited source. No human edits it before it is sent.

**Top News**

Haiku 5.5 is now available through the Claude API, Amazon Bedrock, Claude Platform on AWS, Google Cloud, and Microsoft Foundry. The release also adds beta dynamic workflows to Claude Managed Agents.

Here's what changed:
- Context reaches 1M tokens, with up to 128k output tokens.
- Adaptive thinking is enabled by default and supports the effort parameter. Set `thinking.display` to `"summarized"` to receive thinking text, which uses additional tokens.
- Managed Agents can create workflows for multi-part work. The server runs multiple agents in phases, combines their results, and emits `workflow_run.*` events.

One catch: Haiku 4.5 requests using manual extended thinking with `budget_tokens`, sampling parameters, assistant-message prefill, or `computer_20250124` can return 400 errors. Use the replacement computer toolset for your platform. Structured outputs are unavailable on Bedrock.

Try it: Use `claude-haiku-5-5` in a Claude API request.

Sources: [platform.claude.com](https://platform.claude.com/docs/en/release-notes/overview)