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OpenSpec vs Prime Agent
A side by side look at OpenSpec and Prime Agent: pricing, features and what each one is best for.
In this comparison
All comparisons
| Visit OpenSpec | Visit Prime Agent | |
|---|---|---|
| What it costs | ||
| Pricing | Open source | Open source |
| Pricing details | Free and MIT licensed. Installs with npm, pnpm, bun, yarn or nix. No pricing page, no paid tier and no hosted service. | Free and MIT licensed, installed with a checksum-verified script from app.primeintellect.ai. On first launch you run /login and pick either a subscription or an API-key provider, so inference is billed by whichever provider you choose. Prime Intellect publishes no pricing page for the agent itself. |
| Price range | $0/mo | No pricing page found |
| Free option | Free tier | Free tier |
| Plans |
|
|
| What it is | ||
| What it does | Open source spec-driven development CLI for coding agents. Slash commands make Claude Code, Codex, Cursor and 30+ others propose, apply and verify a spec. | An MIT-licensed coding and research agent from Prime Intellect built on a persistent Python REPL, where context is a variable and subagents are function calls. |
| The details | ||
| GitHub stars | 69,255stars | 21,423stars |
| Language | TypeScript | Rust |
| Last commit | 17 Sept 2026 | 30 Sept 2026 |
What it costs
- Pricing
- Open source
- Pricing details
- Free and MIT licensed. Installs with npm, pnpm, bun, yarn or nix. No pricing page, no paid tier and no hosted service.
- Price range
- $0/mo
- Free option
- Free tier
- Plans
- Free$0/mo
What it is
- What it does
- Open source spec-driven development CLI for coding agents. Slash commands make Claude Code, Codex, Cursor and 30+ others propose, apply and verify a spec.
The details
- GitHub stars
- 69,255stars
- Language
- TypeScript
- Last commit
- 17 Sept 2026
What it costs
- Pricing
- Open source
- Pricing details
- Free and MIT licensed, installed with a checksum-verified script from app.primeintellect.ai. On first launch you run /login and pick either a subscription or an API-key provider, so inference is billed by whichever provider you choose. Prime Intellect publishes no pricing page for the agent itself.
- Price range
- No pricing page found
- Free option
- Free tier
- Plans
- Free (MIT, bring your own provider)$0/mo
What it is
- What it does
- An MIT-licensed coding and research agent from Prime Intellect built on a persistent Python REPL, where context is a variable and subagents are function calls.
The details
- GitHub stars
- 21,423stars
- Language
- Rust
- Last commit
- 30 Sept 2026
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Read the full reviews
What each one is actually like to use, tested by hand rather than summarised from the vendor’s own page.
