claudekit / updates / claude-haiku-5-5
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Claude Haiku 5.5

Anthropic introduced Claude Haiku 5.5 on October 7, 2026: the cheapest, fastest, and most capable small model it has ever released, designed for high-volume, cost-sensitive tasks. For requests up to 100,000 tokens it is priced 90% lower than Claude Haiku 4.5, at $0.10 per million input tokens and $0.50 per million output tokens, and on average it costs around 75% less to run. It is the first Haiku-class model with an adjustable effort setting, and the model ID is claude-haiku-5-5.

Model
Official announcement →

This article is a summary based on official documentation.

Overview

Anthropic introduced Claude Haiku 5.5 on October 7, 2026 — the cheapest, fastest, and most capable small model it has ever released. Haiku 5.5 is designed for high-volume, cost-sensitive tasks. The model ID is claude-haiku-5-5, and on average it costs around 75% less to run than Haiku 4.5.

Key features

  • Built for high-volume, cost-sensitive tasks

    Haiku 5.5 is designed for high-volume work like summaries, compactions, database queries, and classification requests. It works especially well for speed-sensitive tasks like live customer support and browser use, and it pairs well with Opus 5.5 and Sonnet 5.5 as a subagent on coding work.

  • A much lower price than Haiku 4.5

    Haiku 5.5 is priced 90% lower than Claude Haiku 4.5 for requests up to 100,000 tokens, and 50% lower for requests over 100,000 tokens. It is especially good value for prompts up to 100,000 tokens, which make up around 90% of requests to the previous Haiku model. Prices per million tokens:

    Haiku 5.5 (≤100K)Haiku 5.5 (>100K)Haiku 4.5
    Input$0.10$0.50$1.00
    Output$0.50$2.50$5.00
    Cache reads$0.01$0.05$0.10
    Cache writes$0.125$0.625$1.25

  • The first Haiku-class model with adjustable effort

    Haiku 5.5 is Anthropic’s first Haiku-class model to come with an adjustable effort setting, so you can trade off cost and performance for each task.

  • Benchmark gains

    Haiku 5.5 scores 39.2% on Terminal-Bench 4.0, an agentic coding evaluation (Haiku 4.5: 0.0%), and 72.4% on OSWorld 2.1 for computer use (Haiku 4.5: 15.7%). Key results are below.

    BenchmarkHaiku 5.5Haiku 4.5Sonnet 5.5
    GDPval-AA v2.116207351840
    AA-Briefcase v1.115786141824
    OSWorld 2.172.4%15.7%83.9%
    Humanity’s Last Exam (no tools)45.9%10.2%56.9%
    Terminal-Bench 4.039.2%0.0%70.6%

Notes

  • Available on all platforms — Claude Haiku 5.5 is available now on all platforms, including Amazon Web Services, Google Cloud, and Microsoft Azure. On the Claude Platform, developers can get started with claude-haiku-5-5.
  • Cybersecurity safeguards — Haiku 5.5’s cybersecurity safeguards are more restrictive than Haiku 4.5’s, but somewhat less restrictive than those applied to other recent models. Its biology safeguards are the same as for Sonnet 5, Sonnet 5.5, and Opus 5.
  • Alignment — Haiku 5.5 shows major improvements across almost all of Anthropic’s alignment evaluations relative to Haiku 4.5.
  • Default Haiku model in Claude Code — starting with Claude Code 2.1.293, Haiku 5.5 is the default Haiku model on the Anthropic API.
  • Also announced
    • Cache reads on Claude Sonnet 5.5 now cost 50% less: $0.10 per million tokens rather than $0.20.
    • A new monthly API credit is rolling out to all Max and Team subscribers for use on the Claude Platform: $100 per month for Max 5x, $200 for Max 20x, and up to $500 for Team.
    • The Claude Python and TypeScript SDKs are adding support for computer use and browser use in beta.
§ 4

Frequently Asked Questions

frequently asked
§ 4.1
What is Claude Haiku 5.5?
Claude Haiku 5.5 is the cheapest, fastest, and most capable small model Anthropic has ever released. It is designed for high-volume, cost-sensitive tasks, and the model ID is `claude-haiku-5-5`.
§ 4.2
How much does it cost?
For requests up to 100,000 tokens, it costs $0.10 per million input tokens and $0.50 per million output tokens, 90% lower than Claude Haiku 4.5. Requests over 100,000 tokens cost $0.50 input and $2.50 output, 50% lower than Haiku 4.5. On average, it costs around 75% less to run.
§ 4.3
When and where is it available?
Claude Haiku 5.5 is available now on all platforms as of October 7, 2026, including Amazon Web Services, Google Cloud, and Microsoft Azure. On the Claude Platform, developers can get started with `claude-haiku-5-5`.
§ 4.4
What is Haiku 5.5 good for?
It is designed for high-volume tasks like summaries, compactions, database queries, and classification requests. It works especially well for speed-sensitive tasks like live customer support and browser use, and pairs well with Opus 5.5 and Sonnet 5.5 as a subagent on coding work.
§ 4.5
What else was announced alongside Haiku 5.5?
Cache reads on Claude Sonnet 5.5 now cost 50% less: $0.10 per million tokens rather than $0.20. Anthropic is rolling out a monthly API credit for Max and Team subscribers on the Claude Platform ($100 for Max 5x, $200 for Max 20x, up to $500 for Team), and adding computer use and browser use support in beta to the Claude Python and TypeScript SDKs.