---
title: "Anthropic ships Haiku 5.5 through Claude API and cloud platforms"
description: "From the The Forward Pass daily issue, October 15, 2026."
canonical: https://theforwardpass.net/archive/daily/2026-10-15/anthropic-ships-haiku-5-5-through-claude-api-and-cloud-platforms
updated: 2026-10-15
---

# Anthropic ships Haiku 5.5 through Claude API and cloud platforms

From The Forward Pass daily issue, October 15, 2026 (https://theforwardpass.net/archive/daily/2026-10-15). Source: https://theforwardpass.net/archive/daily/2026-10-15/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 Anthropic's model for high-volume, latency-sensitive work. It is available through the Claude API, Amazon Bedrock, Claude Platform on AWS, Google Cloud, and Microsoft Foundry.

Here's what changed:
- Haiku 5.5 supports a 1M-token context window and up to 128k output tokens.
- Adaptive thinking is enabled by default, with effort controls. Set `thinking.display` to `"summarized"` to receive thinking text, which counts toward token usage.
- OpenTelemetry export is in beta for tracing Messages API requests and Managed Agents sessions.
- Scheduled Claude Managed Agents deployments are available on Claude Platform on AWS.

One catch: Migration requires checking existing calls. Manual extended thinking, some sampling parameters, assistant message prefill, and the older computer-use tool can return 400 errors. Haiku 5.5 also lacks structured outputs on Bedrock.

Try it: Use `claude-haiku-5-5` through the Claude API.

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