> ## Documentation Index
> Fetch the complete documentation index at: https://veniceai-feat-models-redesign.mintlify.site/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, $3.75 input and $18.75 output per 1M tokens. Anonymized access without your identity.

export const HubMount = ({view, children, ...props}) => {
  const [hub, setHub] = useState(null);
  const [failed, setFailed] = useState(false);
  useEffect(() => {
    let alive = true;
    const w = window;
    if (!w.__veniceModelHub) {
      const urls = w.location.hostname === 'localhost' ? ['http://localhost:3333/data/model-hub.bundle.json', '/data/model-hub.bundle.json'] : ['/data/model-hub.bundle.json'];
      const load = i => fetch(urls[i], {
        cache: 'no-cache'
      }).then(res => {
        if (!res.ok) throw new Error(`bundle ${res.status}`);
        return res.json();
      }).catch(err => i + 1 < urls.length ? load(i + 1) : Promise.reject(err));
      const Frag = <></>.type;
      const h = (type, props, ...kids) => {
        const T = type;
        const {key, ...rest} = props || ({});
        if (!kids.length) return <T key={key} {...rest} />;
        if (kids.length === 1) return <T key={key} {...rest}>{kids[0]}</T>;
        return <T key={key} {...rest}>{kids.map((kid, i) => <Frag key={i}>{kid}</Frag>)}</T>;
      };
      w.__veniceModelHub = load(0).then(bundle => new Function(`return (${bundle.code})`)()({
        h,
        Fragment: Frag,
        useState,
        useEffect,
        useRef,
        useMemo,
        useCallback
      }));
    }
    w.__veniceModelHub.then(instance => {
      if (alive) setHub(instance);
    }).catch(() => {
      w.__veniceModelHub = null;
      if (alive) setFailed(true);
    });
    return () => {
      alive = false;
    };
  }, []);
  const View = hub ? hub[view] : null;
  if (View) return <View {...props}>{children}</View>;
  if (failed) {
    return <div className="vx-mount is-failed">
        <p className="vx-mount-note">The interactive model catalog could not load. The full data is below.</p>
        {children}
      </div>;
  }
  return <div className="vx-mount" aria-busy="true">
      <div className="vx-mount-skeleton" aria-hidden="true"><span /><span /><span /></div>
      <div className="vx-mount-source">{children}</div>
    </div>;
};

<HubMount view="ModelPage" data={{"family":{"slug":"claude-sonnet-5-5","name":"Claude Sonnet 5.5","modality":"text","task":"chat","provider":"anthropic","description":"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.","primary":"claude-sonnet-5-5","variants":["claude-sonnet-5-5"],"created":1790380800,"updated":1790380800,"privacy":["anonymized"]},"models":[{"id":"claude-sonnet-5-5","name":"Claude Sonnet 5.5","type":"text","modality":"text","task":"chat","variant":"standard","provider":"anthropic","created":1790380800,"description":"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.","privacy":"anonymized","text":{"context":1000000,"maxOutput":128000,"reasoning":{"supported":true,"effort":["low","medium","high","xhigh","max"],"defaultEffort":"medium"},"caps":{"tools":true,"structured":true,"vision":true,"maxImages":10,"webSearch":true,"code":true}},"pricing":{"input":3.75,"output":18.75,"cacheRead":0.375,"cacheWrite":4.6875,"blended":7.5},"headline":{"value":7.5,"unit":"per 1M tokens","basis":"blended"},"endpoints":[{"id":"chat","method":"POST","path":"/chat/completions","name":"Chat Completions","status":"stable","recommended":true},{"id":"responses","method":"POST","path":"/responses","name":"Responses","status":"alpha"}],"family":"claude-sonnet-5-5"}],"related":{"similar":[{"slug":"kimi-k3","name":"Kimi K3","provider":"moonshot","modality":"text","privacy":["private","e2ee"],"created":1784160000,"headline":{"value":7.5,"unit":"per 1M tokens","basis":"blended"},"variants":3},{"slug":"gpt-5-4","name":"GPT-5.4","provider":"openai","modality":"text","privacy":["anonymized"],"created":1772668800,"headline":{"value":7.0475,"unit":"per 1M tokens","basis":"blended"},"variants":1},{"slug":"gpt-5-6-sol","name":"GPT-5.6 Sol","provider":"openai","modality":"text","privacy":["anonymized"],"created":1783555200,"headline":{"value":10,"unit":"per 1M tokens","basis":"blended"},"variants":1},{"slug":"gpt-5-6-sol-pro","name":"GPT-5.6 Sol Pro","provider":"openai","modality":"text","privacy":["anonymized"],"created":1783555200,"headline":{"value":10,"unit":"per 1M tokens","basis":"blended"},"variants":1}],"versions":[{"slug":"claude-sonnet-5","name":"Claude Sonnet 5","provider":"anthropic","modality":"text","privacy":["anonymized"],"created":1782691200,"headline":{"value":6,"unit":"per 1M tokens","basis":"blended"},"variants":1},{"slug":"claude-sonnet-4-6","name":"Claude Sonnet 4.6","provider":"anthropic","modality":"text","privacy":["anonymized"],"created":1771286400,"headline":{"value":7.2,"unit":"per 1M tokens","basis":"blended"},"variants":1},{"slug":"claude-sonnet-4-5","name":"Claude Sonnet 4.5","provider":"anthropic","modality":"text","privacy":["anonymized"],"created":1736899200,"headline":{"value":7.5,"unit":"per 1M tokens","basis":"blended"},"variants":1}]},"providers":{"anthropic":{"slug":"anthropic","name":"Anthropic","logo":"/images/icons/models/opus.svg"},"moonshot":{"slug":"moonshot","name":"Moonshot AI","logo":"/images/icons/models/kimi.svg"},"openai":{"slug":"openai","name":"OpenAI","logo":"/images/icons/models/openai.svg"}},"faq":[{"q":"How much does the Claude Sonnet 5.5 API cost?","a":"$3.75 per 1M input tokens and $18.75 per 1M output tokens, with cached input at $0.38 per 1M. Prices are in USD and can be paid in DIEM at parity."},{"q":"What is the Claude Sonnet 5.5 model ID?","a":"Use `claude-sonnet-5-5` as the `model` parameter."},{"q":"Is the Claude Sonnet 5.5 API private?","a":"Claude Sonnet 5.5 is anonymized: Venice forwards requests to the provider without your identity, but the provider may retain prompt data, so use a private model for sensitive work."},{"q":"What is the context window of Claude Sonnet 5.5?","a":"1M tokens of context, with up to 125K output tokens per response."},{"q":"What does Claude Sonnet 5.5 support?","a":"Claude Sonnet 5.5 supports function calling, structured outputs, reasoning, image input, web search and prompt caching. Reasoning effort is adjustable with `reasoning_effort`: low, medium, high, xhigh and max (default medium)."},{"q":"Which endpoint does the Claude Sonnet 5.5 API use?","a":"Call `POST /chat/completions`. `/responses` (Alpha) is also supported."}]}} />

<div className="vx-static">
  <Accordion title="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 | $3.75 input / $18.75 output per 1M tokens |

    ## Claude Sonnet 5.5 specifications

    | Spec | Value |
    | - | - |
    | Provider | Anthropic |
    | Released | Sep 26, 2026 |
    | Privacy | Anonymized |
    | Context window | 1M tokens |
    | Max output | 125K 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={null}
    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"
      }'
    ```

    ## Claude Sonnet 5.5 API FAQ

    ### How much does the Claude Sonnet 5.5 API cost?

    $3.75 per 1M input tokens and $18.75 per 1M output tokens, with cached input at \$0.38 per 1M. Prices are in USD and can be paid in DIEM at parity.

    ### What is the Claude Sonnet 5.5 model ID?

    Use `claude-sonnet-5-5` as the `model` parameter.

    ### Is the Claude Sonnet 5.5 API private?

    Claude Sonnet 5.5 is anonymized: Venice forwards requests to the provider without your identity, but the provider may retain prompt data, so use a private model for sensitive work.

    ### What is the context window of Claude Sonnet 5.5?

    1M tokens of context, with up to 125K output tokens per response.

    ### What does Claude Sonnet 5.5 support?

    Claude Sonnet 5.5 supports function calling, structured outputs, reasoning, image input, web search and prompt caching. Reasoning effort is adjustable with `reasoning_effort`: low, medium, high, xhigh and max (default medium).

    ### Which endpoint does the Claude Sonnet 5.5 API use?

    Call `POST /chat/completions`. `/responses` (Alpha) is also supported.

    ## Related models

    * [Claude Sonnet 5 API](/models/claude-sonnet-5): $3.00 input / $15.00 output per 1M tokens
    * [Claude Sonnet 4.6 API](/models/claude-sonnet-4-6): $3.60 input / $18.00 output per 1M tokens
    * [Claude Sonnet 4.5 API](/models/claude-sonnet-4-5): $3.75 input / $18.75 output per 1M tokens
    * [Kimi K3 API](/models/kimi-k3): $3.75 input / $18.75 output per 1M tokens
    * [GPT-5.4 API](/models/gpt-5-4): $3.13 input / $18.80 output per 1M tokens
    * [GPT-5.6 Sol API](/models/gpt-5-6-sol): $5.00 input / $25.00 output per 1M tokens
    * [GPT-5.6 Sol Pro API](/models/gpt-5-6-sol-pro): $5.00 input / $25.00 output per 1M tokens
  </Accordion>
</div>


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