claude-haiku-5-5 — API, Pricing & Context Window | Vivgrid

claude-haiku-5-5 is the latest model in Anthropic's Haiku tier and the fastest model in the current Claude lineup, built for high-volume, latency-sensitive work such as classification, routing, extraction, and subagent tasks. Succeeding claude-haiku-4-5, it moves to a 1M-token context window and 128K-token max output at a lower per-token price, and runs with adaptive thinking on by default.

On Vivgrid, claude-haiku-5-5 is served through the native Messages API (/messages) with geo-distributed acceleration across AMER, EMEA, and APAC. It uses the same unified Vivgrid API key as the rest of the catalog, so moving an agent from claude-haiku-4-5 is a model-string change. It uses Anthropic's newer tokenizer, so the same text counts as roughly 30% more tokens than on claude-haiku-4-5.

Specifications

Pricing

Pricing in USD per 1M tokens, matching the provider's rates.

Quick start

Call claude-haiku-5-5 through Vivgrid's unified, OpenAI-compatible endpoint. Get an API key from the Vivgrid Console.

curl https://api.vivgrid.com/v1/messages \
  -H "Authorization: Bearer $VIVGRID_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-haiku-5-5",
    "max_tokens": 1024,
    "messages": [
      { "role": "user", "content": "Say hello in English, Chinese and Spanish." }
    ],
    "stream": true
  }'

Prompt caching is billed at $0.125 per 1M cache-write tokens on the 5-minute TTL and $0.20 per 1M on the 1-hour TTL, with cached reads at $0.01.

Prompts over 100K tokens (uncached input, cache reads, and cache writes combined) are billed at the long-context rate: $0.50 input / $0.05 cached read / $0.625 5-minute cache write / $1.00 1-hour cache write / $2.50 output per 1M tokens.

Ideal use cases

• High-volume classification, extraction, and routing
• Subagents and fast steps inside larger agent pipelines
• Real-time assistants where latency matters most
• Teams on claude-haiku-4-5 moving to a 1M-token context at a lower price

Related models

• claude-haiku-4-5 — the prior Haiku release
• claude-sonnet-5-5 — the latest Sonnet model, a step up in capability
• gpt-6-luna — the fast, low-cost gpt-6 model