Claude Sonnet 5.5
Claude Sonnet 5.5 is Anthropic's balanced model for everyday production work. It reads images and reasons step by step before it answers. It takes up to 1M tokens of context and writes up to 128K per response.
Output price
$6.30
USD / 1M tokens
37% below list price
Add $5, get $5 more on your first top-up.
Same Claude Sonnet 5.5. 37% less.
Specs.
- Model ID
- claude-sonnet-5-5
- Made by
- Anthropic
- Context window
- 1M tokens
- Max output
- 128K tokens
- Endpoint
- /v1/chat/completions
- Billing
- Per token, from one balance
Edge gateways
Requests enter at the gateway nearest your app and go straight to the model, so routing adds very little to each call.
One key, every model
Switch models by changing a string. One prepaid balance covers all of them, billed per token.
Nothing stored
We keep token counts for billing, never your prompts or responses.
Call Claude Sonnet 5.5 in a minute.
Point any OpenAI-compatible client at our base URL, keep your key in an environment variable, and use the model ID claude-sonnet-5-5.
import os
from openai import OpenAI
client = OpenAI(
base_url="https://api.promptsforless.com/v1",
api_key=os.environ["PFL_API_KEY"],
)
response = client.chat.completions.create(
model="claude-sonnet-5-5",
messages=[{"role": "user", "content": "Hello!"}],
)
print(response.choices[0].message.content)
Claude Code guide
Cursor guide
OpenAI SDK guideMore from Anthropic.
GoogleQuestions.
How much does Claude Sonnet 5.5 cost?
$6.30 / 1M tokens output and $1.26 / 1M tokens input, 37% below Anthropic's list price. You pay per token from a prepaid balance, with no subscription or minimum. We match your first $5 top-up, so you start with $10 of credit.
Is it the real Claude Sonnet 5.5?
Yes. Your requests run on Anthropic's Claude Sonnet 5.5, not a distilled copy or a substitute. The discount comes from how we buy capacity, not from changing the model.
Which tools can use Claude Sonnet 5.5?
Anything that speaks the OpenAI API: set the base URL to our endpoint and use the model ID claude-sonnet-5-5. Claude Code and the Anthropic SDKs connect through our Anthropic-compatible endpoint. We have setup guides for Cursor, Codex, OpenCode, the OpenAI and Vercel AI SDKs, LangChain and more.
How fast is it?
Requests go through our edge gateways, so the network hop adds very little on top of Claude Sonnet 5.5's own generation time. Responses stream back token by token.