Corrected: Claude Haiku 5.5 launches with lower prices and an effort setting

ClaudeNew modelConfirmed

Correction: Updated on 8 Oct: Claude Haiku 5.5 is now available. Pricing, limits and platforms come from Anthropic's 7 October launch.

Anthropic released Claude Haiku 5.5, which it calls its cheapest, fastest and most capable small model.

It is priced by prompt length: $0.10 per million input tokens and $0.50 per million output tokens for prompts up to 100,000 tokens, and $0.50 / $2.50 above that.
Anthropic says it costs around 75% less to run than Haiku 4.5 on average.
It has a 1M-token context window, 128k max output tokens and adaptive thinking with the effort parameter, making it the first Haiku-class model with an adjustable effort setting.
Code written for Haiku 4.5 can break: manual extended thinking (budget_tokens) returns a 400 error.

Who can use it: Developers on the Claude API (claude-haiku-5-5), Claude in Amazon Bedrock, Claude Platform on AWS, Claude on Google Cloud and Claude in Microsoft Foundry.
When: 2026-10-07 · date only
Available from October 7, 2026. First announced on September 22, 2026 as coming 'in the coming weeks'.

Read the official announcement for access details. Availability can depend on your plan, region or workplace settings.

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