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Anthropic: Claude Haiku 5.5 (fast) (Reasoning)

anthropic/claude-haiku-5.5:fast-reasoning

Anthropic: Claude Haiku 5.5 (fast) (Reasoning) is a 1,000,000-token model served on Composite at $0.0320 per million tokens in and $0.500 per million tokens out.

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Specifications

Specifications and pricing as served by Composite
Model IDanthropic/claude-haiku-5.5:fast-reasoning
ProviderClaude Platform on AWS
Context window1,000,000 tokens
Acceptstext, image, file
Returnstext
Input price$0.0320 per million tokens
Output price$0.500 per million tokens
Prompt cachingSupported — cached input is 60% off the list rate on pay-as-you-go credits
Web search$0.0100 per result
ThinkingOptional - see "Anthropic: Claude Haiku 5.5 (fast) (Reasoning) (Reasoning)" in the catalog to turn it on by default
ModeratedYes - by the provider
Cost on a monthly plan1 request of the daily allowance per call
Plans that may spend on itEvery plan, plus pay-as-you-go credits
Routing endpoints1

Measured on Composite

This model has not carried enough traffic on Composite yet to publish a success rate, a latency figure or a traffic rank. The numbers appear here once it has.

Pricing

$0.0320 per million tokens input · $0.500 per million tokens output

Input and output are charged at the provider’s list price.

On a monthly plan, one call costs 1 request of that day's allowance.

Provider

Claude Platform on AWS

Roleplay fit

Claude models are widely regarded for nuanced, in-character writing and for following detailed system prompts and character cards closely.

Context behavior

With a 1,000,000-token context window, it can hold a long-running roleplay or a full lorebook in memory without losing earlier plot details, so it suits multi-session campaigns and character cards with heavy backstory.

Cost for regular use

It is priced low enough for high-volume daily roleplay without the per-message cost adding up quickly.

From the provider

Claude Haiku 5.5 is Anthropic's small, fast model for high-volume, cost-sensitive work such as summarization, subagents, and browser use. It succeeds Claude Haiku 4.5 with stronger coding, computer use, and...

Supplied by Claude Platform on AWS, not written by Composite.