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Anthropic Launches Claude Haiku 5.5 as a Faster, Cheaper Subagent for Claude Workflows

October 7, 2026 at 22:16 EDT

Foundation Models
AI Agents
Software Dev & Coding

Anthropic has released Claude Haiku 5.5, positioning the small model as a low-cost, high-speed worker for high-volume tasks and as a subagent for larger Claude models such as Opus 5.5 and Sonnet 5.5. The launch gives developers a clearer version of Anthropic's intended agent pattern: use a stronger model to plan and delegate, then send narrow, repetitive work to cheaper Haiku instances.

Oct. 8, 2026 · Anthropic

Haiku 5.5 becomes the cheap worker in Claude's agent stack

Anthropic is pitching Claude Haiku 5.5 for fast, narrow, high-volume work while larger Claude models plan and delegate. Early examples show the appeal: more parallel output in less time at lower cost.

$0.10

Input price per 1M tokens up to 100k prompts

75%

Lower average runtime cost than Haiku 4.5

72.4%

OSWorld 2.1 offline subset score

Haiku subagents in the egg-drop test

Egg-drop output, drawn to scale

The multi-agent run produced more designs while finishing faster and cheaper.

Opus 5.5 alone

Opus plus Haiku subagents

Where developers see fit

Brainstorming, summaries, retrieval, document lookup, compaction and coding side tasks that can be split into many narrow jobs.

Where limits remain

Complex agentic coding still points to Sonnet 5.5 or Opus 5.5, and delegation adds coordination and prompt-design overhead.

The emerging agent pattern

Lead model plans→Haiku workers run→Results return fast

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