Claude Sonnet 5
Claude Sonnet 5 is the previous Sonnet generation from Anthropic; its weights are closed. Through our API it reads images as well as text, calls tools and returns structured output, with a context of up to a million tokens; our catalogue lists no separate reasoning mode for it. It is served by a third-party inference provider through our partner, not on Heabsy hardware: the same key and the same invoice, but no zero data retention, and the request may be processed outside the EEA.
model id: claude-sonnet-5
from openai import OpenAI client = OpenAI( api_key="hb-...", base_url="https://api.heabsy.com/v1",) r = client.chat.completions.create( model="claude-sonnet-5", messages=[{"role": "user", "content": "Hello"}],)print(r.choices[0].message.content)
curl https://api.heabsy.com/v1/chat/completions \ -H "Authorization: Bearer $HEABSY_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "model": "claude-sonnet-5", "messages": [{"role": "user", "content": "Hello"}] }'
import OpenAI from "openai"; const client = new OpenAI({ apiKey: process.env.HEABSY_API_KEY, baseURL: "https://api.heabsy.com/v1",}); const r = await client.chat.completions.create({ model: "claude-sonnet-5", messages: [{ role: "user", content: "Hello" }],});console.log(r.choices[0].message.content);
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Price list, updated 21 October 2026. No minimum spend, no subscription.
Claude and GPT through Heabsy: what changes
The weights of these models are closed, so nobody but the developer and the providers it works with can run them — including us. We pass your request to a partner provider and bill it on our invoice, with the same key you use for every other model in the catalogue.
What you do not get here is what our own models offer: there is no zero data retention, the provider handles the request under its own policy, and processing is not guaranteed to stay in the EEA. For personal or regulated data, use a model on Heabsy hardware.
Technical details
- Context window
- 1M tokens
- Max output
- 128,000 tokens
- Throughput limit
- —
- Tokenizer
- Other
- Streaming
- yes
- Open weights
- —
- max_tokens
- 1 … 128000
This model is served by a third-party inference provider through our partner, not on Heabsy hardware. You keep one key and one invoice from an EU company, but there is no zero data retention: the provider handles the request under its own policy, and processing may take place outside the EEA. For personal or regulated data, use a model on Heabsy hardware.
Questions about this model
›Where is Claude Sonnet 5 computed?
At a third-party inference provider that serves this model through our partner, outside our own infrastructure. Where exactly the request is computed is not fixed and may be outside the EEA. The contract and the invoice stay with our EU company.
›Does Claude Sonnet 5 store prompts and completions?
There is no zero-data-retention guarantee for this model: the request goes to a third-party provider, which handles it under its own policy and may keep logs. For personal or regulated data, use a model on Heabsy hardware.
›How large is the Claude Sonnet 5 context window?
1M tokens, with up to 128,000 tokens of output.
›What does Claude Sonnet 5 cost?
$2.40 per million input tokens and $12.00 per million output tokens. No minimum spend and no subscription; the same price list covers the API and the invoice.
›Is there a throughput limit on Claude Sonnet 5?
The catalog does not report a throughput limit for this model.
Compare with similar models
| Model | Developer | Parameters | Context | Licence | Input / 1M |
|---|---|---|---|---|---|
| Claude Sonnet 5 | Anthropic | — | 1M | — | $2.40 |
| Claude Sonnet 5.5 | Anthropic | — | 1M | — | $2.40 |
| Claude Opus 5.5 | Anthropic | — | 1M | — | $4.80 |
| Claude Opus 5 | Anthropic | — | 1M | — | $6.00 |
35 more models behind the same key and the same invoice.
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