Same frontier models (Anthropic, OpenAI, xAI) as the $20–$200 plans you already know — at half the price. Light is $10, Pro is $30, Heavy is $100.
$ curl -sSL https://storage.googleapis.com/assertion-downloads/install.sh | sh $ cd your-repo && assertion
One checksum-verified assertion binary in /usr/local/bin; assertion upgrade keeps it current.
Normal agents resend the whole conversation on every step, so the cost per step keeps climbing all day. Ours keeps the conversation in a fixed-size window and stores the rest outside the prompt, so the cost per step stays flat. We pass the difference on to you.
Measured on a real 24-step build task run twice with the same model: once on a normal agent, once on Assertion. Same prompts, same tests passing at the end.
You never see a token bill. Each plan includes a week of usage, shown as a percentage that resets every week.
| Plan | Price | Included |
|---|---|---|
| Free | $0 | About 15–20 prompts a week. Enough to see it work, not enough to live on. |
| Light | $10/mo | A working week for one person. |
| Pro | $30/mo | 3× Light. All-day use, the larger models when you want them. |
| Heavy | $100/mo | For people who run the agent all day, every day. |
For reference, the $20 tier elsewhere: Cursor Pro $20 · Claude Code Pro $20 · ChatGPT Plus with Codex $20. Light is $10. List prices, September 2026.
One plan per team. Buy seats — $20 a standard seat, $60 a premium seat (5× the allowance) — and hand them to people; only seat-holders draw on the plan. Usage is pooled across the team, so a quiet week for one person is slack for another.
Real compute, metered honestly — a larger model draws the week down faster, and the picker says so where you choose.
Go through Assertion's gateway to Anthropic, OpenAI or xAI on our keys — the same providers behind the plans you use today. You never hold or paste a provider key.
Your account, your plan and your usage, plus the agent's own working notes for your sessions, private to you. Not your repository.
SOC 2 audit in progress. Independent penetration test completed, with no critical, high or medium findings.
Owners buy seats and hand them to people. Only seat-holders draw on the plan, and owners manage members and seats.
No Intel build, no Windows or Linux app yet. The CLI installer is Apple silicon too.
It's new. Expect sharp edges, and tell us at support@assertion-ai.com when you hit one.
Already on Claude Code, Codex or Cursor? We ship a plugin for those too — install it here. The half price is the agent's, not the plugin's.
Not in the alpha. Models are included in the plan and go through our gateway; that's how usage stays a percentage instead of a bill.
The agent tells you plainly, with the reset day and an upgrade link. Nothing is lost; the week resets and you carry on.
On price: Light is $10 to Cursor Pro's $20, Pro is $30 to Pro+'s $60, Heavy is $100 to Ultra's $200, on the same frontier models (list prices, September 2026). On form: this is a terminal agent and a Mac app, not an IDE — so the closer comparison is Claude Code or Codex, and against those the difference is the price.
Yes. On a team plan the owner buys seats, standard or premium, and hands them to people. Everyone's agent draws on one pooled allowance, billed per seat.
Not yet. The installer and the Mac app are macOS on Apple silicon for now.