> ## Documentation Index
> Fetch the complete documentation index at: https://docs.venice.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Claude Sonnet 5.5 API

> Claude Sonnet 5.5 API on Venice: 1M context, $2.00 input and $10.00 output per 1M tokens. Anonymized access without your identity.

> [accordion] Plain-text specification
>
> ## 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.
>
> ```bash theme={"system"}
> 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"
>   }'
> ```
>
> ### Related models
>
> * [Claude Sonnet 5 API](https://docs.venice.ai/models/claude-sonnet-5.md): $2.00 / $10.00 per 1M
> * [Claude Sonnet 4.6 API](https://docs.venice.ai/models/claude-sonnet-4-6.md): $3.00 / $15.00 per 1M
> * [GPT-6.1 Sol API](https://docs.venice.ai/models/gpt-6-1-sol.md): $2.00 / $10.00 per 1M
> * [GPT-6 Sol API](https://docs.venice.ai/models/gpt-6-sol.md): $2.00 / $10.00 per 1M
> * [Kimi K3.1 Pro API](https://docs.venice.ai/models/kimi-k3-1-pro.md): $2.00 / $10.00 per 1M
> * [Qwen 3.8 2.4T API](https://docs.venice.ai/models/qwen-3-8-2-4t.md): $2.50 / $7.50 per 1M


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