What is Claude Haiku 5.5?

Claude Haiku 5.5 is an Anthropic AI model built for high-volume and latency-sensitive AI workloads that require a balance of speed, cost, context capacity, and reasoning. Its primary use cases include classification, routing, information extraction, and subagent tasks within larger AI systems. Claude Haiku 5.5 introduces adaptive thinking, which allows the model to decide when reasoning is needed and how much thinking to apply before producing a response. Adaptive thinking is enabled by default, while the effort parameter gives developers a way to trade response quality against latency and cost. Developers can disable thinking at high effort or below, but Anthropic recommends using effort as the primary mechanism for controlling the model's reasoning behavior. The model provides a 1 million token context window, representing a substantial increase from the 200,000-token context window available with Claude Haiku 4.5. It can generate as many as 128,000 output tokens compared with the previous model's 64,000-token maximum, although thinking tokens are included within the configured output allowance. Browser use is available through the Claude API and Google Cloud, enabling developers to incorporate the model into workflows that require interaction with browser-based environments. Claude Haiku 5.5 uses the newer tokenizer found in Claude 4.7 and later models, resulting in approximately 30% more tokens for the same text compared with Claude Haiku 4.5, depending on the content. The model also changes several API behaviors, including replacing manual extended thinking with adaptive thinking, rejecting non-default sampling parameters and assistant-message prefills, and requiring updated computer-use tooling for supported environments.

Pricing

Price Starts At:
$0.10 per 1M tokens (input)
Price Overview:
For prompts under 100K tokens, it's $0.10 input / $0.50 output per million tokens with cache reads at $0.01. Above 100K tokens, $0.50 input / output $2.50 per million, with cache reads at $0.05.

Integrations

Offers API?:
Yes, Claude Haiku 5.5 provides an API
All Claude Haiku 5.5 Integrations
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Screenshots and Video

Claude Haiku 5.5 Screenshot 1
Claude Haiku 5.5 Screenshot 1 Claude Haiku 5.5 Screenshot 2

Company Facts

Company Name:
Anthropic
Date Founded:
2021
Company Location:
United States
Company Website:
claude.ai

Product Details

Deployment
SaaS
Training Options
Documentation Hub
Support
Web-Based Support

Product Details

Target Company Sizes
Individual
1-10
11-50
51-200
201-500
501-1000
1001-5000
5001-10000
10001+
Target Organization Types
Mid Size Business
Small Business
Enterprise
Freelance
Nonprofit
Government
Startup
Supported Languages
English

Claude Haiku 5.5 Categories and Features

Multimodal Models

Large Language Models

Foundation Models

AI Vision Models

AI Reasoning Models

AI Models

AI Coding Models

Claude Haiku 5.5 Customer Reviews

Write a Review
  • Reviewer Name: A Verified Reviewer
    Position: Software Engineer
    Has used product for: 6-12 Months
    Uses the product: Daily
    Org Size (# of Employees): 100 - 499
    Feature Set
    Cost
    Would you Recommend to Others?
    1 2 3 4 5 6 7 8 9 10

    Finally a super fast/cheap model from Anthropic

    Date: Oct 07 2026
    Summary

    Claude Haiku 5.5 is an excellent choice when speed and efficiency matter more than having the absolute smartest model available. It's surprisingly capable for such a lightweight model and works especially well for high-volume workloads, quick coding tasks, and everyday automation. I wouldn't choose it for my hardest problems, but for routine work it's one of the most practical Claude models available.

    Positive

    Claude Haiku 5.5 is impressively fast while still being capable enough for a wide range of everyday AI tasks. I found it particularly good for quick coding work, summaries, classification, and other high-volume tasks where responsiveness matters. It's a substantial improvement over Haiku 4.5 and offers a great balance between intelligence, speed, and cost.

    Negative

    Haiku 5.5 is still designed as the lightweight model in the Claude lineup, and that becomes noticeable on more complicated reasoning and long-running tasks. For difficult coding problems or work that requires a lot of judgment, I'd still rather use Sonnet 5.5 or Opus 5.5.

    Read More...
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