Head to head · Agent harness · October 2026 research run

Kilo Code CLI vs Prime Agent

Kilo Code CLI scores 75.4 (BB) on agent readiness against Prime Agent's 60.5 (C), and leads in 5 of 7 scored categories. Prime Agent leads on payments & pricing. Both do agent harness.

Which one, for what

Kilo Code CLI BB

Good for Developers who want an open-source terminal agent with per-tool permission rules, an optional sandbox and a choice of provider, and the same engine in VS Code and JetBrains.

Ahead on

  • Reliability, 85 against 65
  • Schema & documentation, 90 against 42
  • Security & auth, 66 against 50
  • Maintenance & community, 87 against 79
  • Transparency & trust, 76 against 64

Also in its favour

  • Agent-ready, a grade of BB or better

Watch for

Telemetry to PostHog is on by default, and the privacy policy and PRIVACY.md don't mention it

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 50

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

CategoryWeight this runKilo Code CLIPrime AgentEdge
Reliability16%208565Kilo Code CLI +20
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.29042Kilo Code CLI +48
Agent ergonomics13%16.27273Prime Agent +1
Security & auth14%17.56650Kilo Code CLI +16
Payments & pricing10%12.55060Prime Agent +10
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88779Kilo Code CLI +8
Transparency & trust7%8.87664Kilo Code CLI +12
Negative events≤1500
Total75.4 · BB60.5 · C

Facts side by side

FactKilo Code CLIPrime Agent
KindAgent harnessAgent harness
VendorKilo Code Inc.Prime Intellect
Hosted endpointno (local only)no (local only)
Transports
AuthOAuth or keyNone
PricingFreemiumFree
x402nono
LicenceMITMIT
Read-only variant documentednono
llms.txtyesno
Last release2026-10-072026-10-07
Terms last updated2026-09-30no date given
Privacy policy last updated2026-05-29no date given
Customer content may train modelsnot found in the textnot found in the text
Terms restrict automated accessyesyes
Terms restrict benchmarkingnot found in the textyes
Terms or service can change without noticeyesyes
Arbitration or class-action waiveryesyes
Popularity28k stars, 33k npm/wk22k stars

Verdicts

Kilo Code CLI

Shell commands ask before running by default, and an optional operating-system sandbox blocks writes outside the workspace and outbound network. Telemetry to PostHog is on by default and the sandbox is off, so an unattended kilo run --auto approves everything not denied unless both are configured first.

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

Kilo Code CLI

  1. Set sandbox.enabled to true in the global kilo.jsonc before kilo run --auto. --auto approves every permission request not explicitly denied
  2. Set experimental.openTelemetry to false, or KILO_TELEMETRY_LEVEL to a value other than all, to stop telemetry
  3. Add needed hosts to sandbox.allowed_hosts in global config. MCP tool calls are unavailable while network restriction is on
  4. Without --auto a non-interactive run rejects every permission prompt and exits 1
  5. Put provider keys in global config or the environment. {env:VAR} in a project kilo.json is ignored

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, Kilo Code CLI or Prime Agent?

Kilo Code CLI scores 75.4 (BB) on agent readiness against Prime Agent's 60.5 (C), and leads in 5 of 7 scored categories. Prime Agent leads on payments & pricing.

Are Kilo Code CLI and Prime Agent open source?

Yes. Kilo Code CLI is open source (MIT). Prime Agent is open source (MIT).

Other comparisons with Kilo Code CLI or Prime Agent

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