Anthropic's latest mid-tier model, with strong reasoning, coding, and agentic tool use across a 1M-token context at half the list price of Opus 5.5. A strong default for high-volume production work.
Every rate is 50% of the provider's official list price. USD per million tokens.
| Token type | List price | Tokenless |
|---|---|---|
| Input | $2.00 | $1.00 |
| Output | $10.00 | $5.00 |
| Cache write | $2.50 | $1.25 |
| Cache read | $0.10 | $0.05 |
Tokenless speaks the OpenAI Chat Completions format. Point your client at the base URL, set model to sonnet-5.5, and you are done.
curl https://api.tokenless.store/api/v1/chat/completions \
-H "Authorization: Bearer $TOKENLESS_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "sonnet-5.5",
"messages": [{ "role": "user", "content": "Hello" }]
}'