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Claude Haiku 5.5
Anthropic's fastest, lowest-cost model for high-volume work such as classification, extraction, routing, summaries, and sub-agent tasks. Text and image input, 1M context, 128K output including thinking, and medium default effort. Adaptive thinking is on by default; thinking can be disabled at high effort or below. Prompts over 100K tokens are billed at 5x rates.
Web Search
Web Fetch
Code Execution
Specifications
| Provider | Anthropic |
| Category | Text |
| Context window | 1M tokens |
Pricing (Starter tier)
13.00 credits / 1M input tokens
1.30 credits / 1M cached input tokens
16.25 credits / 1M cache-write tokens (5 minutes)
65.00 credits / 1M output tokens
Above 100K input: 5x all token rates
Higher tiers get volume discounts. See tiers
Quick Start
curl -N https://query.genx.sh/v1/chat/completions \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{"model":"claude-haiku-5-5","messages":[{"role":"user","content":"Classify this support ticket as billing, bug, or feature request: My invoice was charged twice this month."}],"max_tokens":2048,"reasoning_effort":"low","stream":true}'
Parameters
| Name | Type | Required | Default | Description |
|---|---|---|---|---|
prompt |
string | required | — | The input text prompt |
system_prompt |
string | optional | — | System instructions |
image_url |
string | optional | — | Image URL to analyze |
max_tokens |
number | optional | 128000 |
Maximum output tokens including thinking, up to 128000. Leave room for thinking on short-answer tasks. |
effort |
string | optional | medium |
low, medium, high, xhigh, or max. Use low for simple high-volume tasks. |
thinking |
object | optional | — | Omit or use type adaptive, optionally with display omitted or summarized. {type: disabled} is accepted at effort high or below. Manual budgets and between_tools are unsupported. |
tools |
array | optional | — | Built-in web_search, web_fetch, and code_execution. Code execution requires web_search or web_fetch version 20260209 or newer alongside it. Queue sessions do not support custom function tools. |
Availability
Claude Haiku 5.5 is available in the GenX Pro App and via the GenX Router API.