Claude Sonnet 5.5 API price
On OpenCheap, Claude Sonnet 5.5 (Anthropic) costs $1.20 per 1M input tokens and $6.00 per 1M output tokens (cached input $0.100), through one OpenAI-compatible API.
Prices updated 2026-11-03 21:05 UTC.
Price per 1M tokens
| Input, our price | $1.20 |
|---|---|
| Output, our price | $6.00 |
| Cached input, our price | $0.100 |
| Context length | 1M tokens |
| OpenRouter list, input · output | $2.00 · $10.00 |
| vs list | −40% |
“vs list” compares our price with OpenRouter's list price on a 1:3 input:output blend, as on the Models page.
Variants
- Claude Sonnet 5.5 Thinking (
opencheap/claude-sonnet-5.5:thinking): $3.00 input · $15.00 output per 1M tokens
How to call Claude Sonnet 5.5
Base URL https://api.opencheap.si/v1, model id opencheap/claude-sonnet-5.5, and an API key from the console. Any OpenAI SDK works.
curl https://api.opencheap.si/v1/chat/completions \
-H "Authorization: Bearer $OPENCHEAP_API_KEY" -H "Content-Type: application/json" \
-d '{ "model": "opencheap/claude-sonnet-5.5", "messages": [{ "role": "user", "content": "Hi" }] }'import os
from openai import OpenAI
client = OpenAI(base_url="https://api.opencheap.si/v1", api_key=os.environ["OPENCHEAP_API_KEY"])
r = client.chat.completions.create(model="opencheap/claude-sonnet-5.5",
messages=[{"role": "user", "content": "Hi"}])
print(r.choices[0].message.content)FAQ
How much does the Claude Sonnet 5.5 API cost on OpenCheap?
On OpenCheap, Claude Sonnet 5.5 costs $1.20 per 1M input tokens and $6.00 per 1M output tokens, and cached input $0.100 per 1M tokens. Each request is routed to the cheapest healthy source for the model. You pay from one prepaid balance, with no monthly fee.
Is it OpenAI-compatible?
Yes. Point any OpenAI SDK or HTTP client at the base URL https://api.opencheap.si/v1 with an OpenCheap API key, and call /chat/completions with the model id opencheap/claude-sonnet-5.5. Requests and responses have the same shape as OpenAI's chat completions, streaming included.
Does it work with Cursor, Claude Code or Codex?
Yes. In Cursor, add the custom model opencheap/claude-sonnet-5.5 with the base URL https://api.opencheap.si/v1. In Claude Code, set ANTHROPIC_BASE_URL to https://api.opencheap.si and ANTHROPIC_MODEL to opencheap/claude-sonnet-5.5. In Codex, add OpenCheap as a model provider with base_url https://api.opencheap.si/v1. The quickstart has each setup step by step.