Claude Sonnet 5.5 API: Pricing and Specs

Claude Sonnet 5.5 API

Claude Sonnet 5.5 is a large language model by Anthropic, available on the Venice API as claude-sonnet-5-5. Requests are anonymized, so the provider never sees your identity.Claude Sonnet 5.5 is a step-change improvement over Sonnet 5. It performs great with well-scoped everyday tasks like building features, fixing bugs, and creating polished documents, slides, and spreadsheets. Sonnet 5.5 also improves on communication and writes more clearly than Sonnet 5. It features a 1M token context window, 128K max output tokens, adaptive thinking, and strong document and vision understanding.

Claude Sonnet 5.5 API pricing

Model ID	Variant	Privacy	Price
`claude-sonnet-5-5`	Standard	Anonymized	$2.00 / $10.00 per 1M

Claude Sonnet 5.5 specifications

Spec	Value
Provider	Anthropic
Released	Sep 26, 2026
Privacy	Anonymized
Status	Stable
Context window	1M tokens
Max output	128K tokens
Reasoning effort	low, medium, high, xhigh, max

How to use the Claude Sonnet 5.5 API

Send requests to POST https://api.venice.ai/api/v1/chat/completions with "model": "claude-sonnet-5-5" and your API key.

curl https://api.venice.ai/api/v1/chat/completions \
  -H "Authorization: Bearer $VENICE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-sonnet-5-5",
    "messages": [{ "role": "user", "content": "Explain TEE attestation in two sentences." }],
    "reasoning_effort": "medium"
  }'

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