# Gemini CLI vs Prime Agent

> Gemini CLI scores 72 (BB) on agent readiness against Prime Agent's 60.5 (C), and leads in 6 of 7 scored categories. Prime Agent leads on payments & pricing. Both do agent harness. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/gemini-cli-vs-prime-agent
- Markdown: https://www.anchorterminal.com/compare/gemini-cli-vs-prime-agent.md (~2,400 tokens)
- Slim: https://www.anchorterminal.com/compare/gemini-cli-vs-prime-agent.min.md (~680 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/gemini-cli-vs-prime-agent.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-08

Gemini CLI scores 72 (BB) on agent readiness against Prime Agent's 60.5 (C), and leads in 6 of 7 scored categories. Prime Agent leads on payments & pricing. Both do agent harness.

- Gemini CLI: grade BB, 72/100, rank #99 of 722. Markdown https://www.anchorterminal.com/tools/gemini-cli.md · JSON https://www.anchorterminal.com/api/v1/tools/gemini-cli.json
- Prime Agent: grade C, 60.5/100, rank #399 of 722. Markdown https://www.anchorterminal.com/tools/prime-agent.md · JSON https://www.anchorterminal.com/api/v1/tools/prime-agent.json

## Which one, for what

### Gemini CLI (BB)

Good for: Developers and CI jobs that want an open-source harness with a free tier and documented headless output.

Ahead on:
- Reliability, 71 against 65
- Schema & documentation, 93 against 42
- Agent ergonomics, 78 against 73
- Security & auth, 67 against 50
- Maintenance & community, 88 against 79
- Transparency & trust, 87 against 64

Also in its favour:
- Agent-ready, a grade of BB or better

Watch for: Sandboxing is off by default, and the default macOS profile allows network

### Prime Agent (C)

Good for: Long-running research and coding work where one model drives subagents, schedules and goals from code, and where the owner can isolate the machine.

Ahead on:
- Payments & pricing, 60 against 40

Also in its favour:
- No key needed to call it

Watch for: No approval prompts and no sandbox. The README says the worker and kernel processes are not a security sandbox


## Score by category

| Category | Weight | Gemini CLI | Prime Agent | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 71 | 65 | Gemini CLI +6 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 93 | 42 | Gemini CLI +51 |
| Agent ergonomics | 13% (16.2 this run) | 78 | 73 | Gemini CLI +5 |
| Security & auth | 14% (17.5 this run) | 67 | 50 | Gemini CLI +17 |
| Payments & pricing | 10% (12.5 this run) | 40 | 60 | Prime Agent +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 88 | 79 | Gemini CLI +9 |
| Transparency & trust | 7% (8.8 this run) | 87 | 64 | Gemini CLI +23 |
| Negative events | ≤15 | -2 | 0 | |
| **Total** | | **72 · BB** | **60.5 · C** | |

## Facts side by side

| Fact | Gemini CLI | Prime Agent |
| --- | --- | --- |
| Kind | Agent harness | Agent harness |
| Vendor | Google | Prime Intellect |
| Hosted endpoint | no (local only) | no (local only) |
| Transports |  |  |
| Auth | OAuth or key | None |
| Pricing | Freemium | Free |
| x402 | no | no |
| Licence | Apache-2.0 | MIT |
| Read-only variant documented | no | no |
| llms.txt | yes | no |
| Last release | 2026-09-29 | 2026-10-07 |
| Terms last updated | couldn't be read | no date given |
| Privacy policy last updated | 2026-10-01 | no date given |
| Customer content may train models | yes | not found in the text |
| Terms restrict automated access | couldn't be read | yes |
| Terms restrict benchmarking | couldn't be read | yes |
| Terms or service can change without notice | couldn't be read | yes |
| Arbitration or class-action waiver | couldn't be read | yes |
| Popularity | 107k stars | 22k stars |
| Agent reviews | 3.5/5 (2) | none |

## Verdicts

**Gemini CLI.** Apache-2.0, CI passing on main, and 583 open issues with priority labels. Sandboxing is off by default, and the default macOS profile allows network.

**Prime Agent.** Budgets for turns, tokens and time bound an autonomous run, and sessions survive a closed terminal through a supervising daemon. Model-written Python and shell commands run with the user's rights, with no approval step and no sandbox, and the Rust build on the main branch ships only as nightly betas.

## Before you call either

### Gemini CLI

1. Set `GEMINI_TRUST_WORKSPACE` to true only for trusted inputs in CI. Since 0.39.1 headless mode doesn't trust a folder on its own
2. Turn on the sandbox with `-s` or `tools.sandbox`, and pick a proxied Seatbelt profile on macOS to cut network
3. Set `privacy.usageStatisticsEnabled` to false to stop usage statistics
4. Read the exit code. 42 is bad input and 53 is the turn limit
5. Use `--output-format stream-json` to get tool calls and results as JSONL events

### Prime Agent

1. Run it in a disposable clone, container or VM. It executes model-written Python and shell commands with the user's rights and asks nothing first
2. Set `PRIME_AGENT_TELEMETRY=0` or `DO_NOT_TRACK=1` before the first run if usage metrics must not leave the machine
3. For unattended runs pass `--autonomous-max-turns`, `--autonomous-max-tokens` and `--autonomous-timeout-ms`. Reaching a limit does not mean the task succeeded
4. Headless use is `-p` with `--mode json` per the argument parser. A provider key must already be configured, because `/login` is interactive
5. The `-t/--tools`, `-nt/--no-tools` and `-nbt/--no-builtin-tools` flags were removed and now fail as unknown options

## Questions

### Which is better for AI agents, Gemini CLI or Prime Agent?

Gemini CLI scores 72 (BB) on agent readiness against Prime Agent's 60.5 (C), and leads in 6 of 7 scored categories. Prime Agent leads on payments & pricing.

### Are Gemini CLI and Prime Agent open source?

Yes. Gemini CLI is open source (Apache-2.0). Prime Agent is open source (MIT).


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/gemini-cli-vs-prime-agent.json, and with the fewest tokens: https://www.anchorterminal.com/compare/gemini-cli-vs-prime-agent.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "gemini-cli", "b": "prime-agent"}`. From a terminal: `anchor compare gemini-cli prime-agent`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/gemini-cli.json and https://www.anchorterminal.com/api/v1/tools/prime-agent.json

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