Claude Haiku 5.5 - Unifically

Claude Haiku 5.5 is Anthropic’s small, fast model from the Claude 5.5 family, released October 7, 2026, for high-volume, latency-sensitive work such as classification, extraction, routing and sub-agent tasks. It takes text and image input, outputs text, and carries a 1M token context window with up to 128k output tokens. It uses adaptive thinking steered by effort, which defaults to medium. Leave temperature, top_p and top_k unset; non-default values return a 400 error. Pricing is tiered by prompt length: when a request’s prompt (input plus cached tokens) is over 100,000 tokens, every token in that request bills at the higher tier. Both tiers are listed on the pricing page. Try it in the browser: Claude Haiku 5.5 API playground.

Model

anthropic/claude-haiku-5-5


Provider	Anthropic
Name	Claude Haiku 5.5

Supported Endpoints

All three API formats are supported:

Chat Completions — POST /v1/chat/completions
Responses — POST /v1/responses
Messages — POST /v1/messages

Example

curl -X POST https://api.unifically.com/v1/messages \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -d '{
    "model": "anthropic/claude-haiku-5-5",
    "max_tokens": 1024,
    "messages": [
      {"role": "user", "content": "Classify this ticket as billing, bug, or feature request and return JSON: \"I was charged twice for my top-up.\""}
    ]
  }'

Volume discounts are available for almost all models. Reach out at contact@unifically.com to discuss custom pricing.

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Supported Endpoints

Example