$50/week creditAnthropic
Use Sonnet 5.5 free
Use Sonnet 5.5 from Anthropic with $50 of free credit every week in the FreeFlow Harness, a desktop AI coding agent. No subscription, no API key.
Anthropic's balanced model for everyday coding.
- Input
- $2 / 1M tokens
- Output
- $10 / 1M tokens
- $50 buys
- 5M output tokens
- Typical tasks a week
- About 555
A typical task here reads about 30,000 tokens of code and writes about 3,000. Real tasks vary.
How to use Sonnet 5.5 for free
Create a free account
Email and password, no card. Then create an API key in your dashboard.
Install the Harness
Download it for Windows, macOS or Linux and paste your key.
Pick Sonnet 5.5
Choose it from the model picker, open a project folder and describe a change.
Questions about Sonnet 5.5
Something else? Ask support or read the docs.
- Is Sonnet 5.5 really free on FreeFlow?
- Yes. Every account gets $50 of free credit every Monday, and Sonnet 5.5 requests are paid from it at $2 per million input tokens and $10 per million output tokens. You never pay anything yourself.
- How far does $50 go on Sonnet 5.5?
- About 555 typical coding tasks a week, if a task reads around 30,000 tokens of code and writes 3,000. Your dashboard shows exactly what each request cost.
- What happens when my credit runs out?
- Sonnet 5.5 pauses until your credit refills on Monday at 00:00 UTC. Ling 3.1 Flash, Muse Spark 1.3 and GLM 5.3 Flash keep working with no limit.
- Can I use Sonnet 5.5 in my own app or editor?
- FreeFlow's models run inside the FreeFlow Harness, which works on any project folder alongside whatever editor you use. Requests from other software aren't supported, because the Harness's ads pay for the tokens.