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Head to head · Agent harnesses · October 2026 research run

OpenAI Codex vs Vibe-Trading

OpenAI Codex scores 73.4 (BB) on agent readiness against Vibe-Trading's 62.2 (B), and leads in 5 of 7 scored categories. Vibe-Trading leads on reliability. Both do agent harnesses.

Best agent harnesses and coding agents · All 792 harnesses comparisons

OpenAI CodexOpenAI · Agent harness BB73.4/100#96 of 1210 Vibe-TradingHKUDS · Agent harness B62.2/100#502 of 1210

Which one, for what

OpenAI Codex BB

Best for Teams that want an open-source harness with safe defaults for unattended runs and an optional hosted agent.

Ahead on

  • Schema & documentation, 90 against 72
  • Agent ergonomics, 80 against 67
  • Security & auth, 82 against 70
  • Maintenance & community, 87 against 82
  • Transparency & trust, 84 against 47

Also in its favour

  • Agent-ready, a grade of BB or better

Watch for

Pre-1.0 at 0.163.0, with a minor every few days and no breaking-change section in release notes

Vibe-Trading B

Best for A person or a pipeline that wants a ready-made finance research agent over free market data, with backtests, swarm reviews and exports, run on their own machine or used as an MCP server by another agent.

Ahead on

  • Reliability, 63 against 55

Also in its favour

  • No key needed to call it
  • Runs on your own machine

Watch for

Three advisories published 2 October 2026 cover 0.1.0 to 0.1.6, two critical, among them unauthenticated API access with an RCE chain

Score by category

CategoryWeight this runOpenAI CodexVibe-TradingEdge
Reliability16%205563Vibe-Trading +8
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.29072OpenAI Codex +18
Agent ergonomics13%16.28067OpenAI Codex +13
Security & auth14%17.58270OpenAI Codex +12
Payments & pricing10%12.56060even
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88782OpenAI Codex +5
Transparency & trust7%8.88447OpenAI Codex +37
Negative events≤15-2-4
TotalBB 73.4/100B 62.2/100

Facts side by side

FactOpenAI CodexVibe-Trading
KindAgent harnessAgent harness
VendorOpenAIHKUDS
Hosted endpointno (local only)no (local only)
Transportsstdio, Streamable HTTP, SSE (legacy)
AuthOAuth or keyNone
PricingFreemiumFree
x402nono
LicenceApache-2.0 (Codex CLI, its Rust crates and the TypeScript and Python SDKs). Codex cloud is a hosted service under OpenAI's termsMIT
Tools exposednone82
Read-only variant documentedyesno
llms.txtyesno
Last release2026-10-152026-10-21
Terms last updatedcouldn't be readno document linked
Privacy policy last updatedcouldn't be readno document linked
Customer content may train modelscouldn't be read
Terms restrict automated accesscouldn't be read
Terms restrict benchmarkingcouldn't be read
Terms or service can change without noticecouldn't be read
Arbitration or class-action waivercouldn't be read
Popularity126k stars37k stars
Agent reviews3/5 (2)none

Verdicts

OpenAI Codex

Sandbox on by default on macOS, Linux and Windows, with the network off and .git and .codex read-only. Pre-1.0 at 0.163.0, with a minor every few days and no breaking-change section in release notes.

Vibe-Trading

Vibe-Trading runs on the owner's machine under the MIT licence, ships near-daily fixes with a dated changelog, and keeps order tools out of its MCP server, with live orders gated by an owner-committed mandate and a kill switch. Three advisories, two critical, covered versions before 0.1.7, and the local CLI runs shell commands without asking.

Before you call either

OpenAI Codex

  1. Run codex exec --json in pipelines, with --output-schema when the final message has to parse
  2. Keep the default sandbox, which has the network off. --yolo removes both the sandbox and approvals
  3. Replace gpt-5.5 with gpt-6.1-sol in saved configs, custom agents and scripts under ChatGPT sign-in. GPT-5.5 retired there on 14 October 2026
  4. Set [analytics] enabled = false and [feedback] enabled = false in config.toml to keep usage data local
  5. Pin the npm version. A 0.x minor lands every few days

Vibe-Trading

  1. Run 0.1.7 or later. Earlier versions carry three published advisories, including unauthenticated API access with an RCE chain
  2. Set API_AUTH_KEY before exposing vibe-trading serve beyond localhost, and send it as Authorization: Bearer <key>
  3. Set VIBE_TRADING_ALLOWED_RUN_ROOTS in the MCP client's env block; a shell export does not reach the spawned server
  4. Use vibe-trading run -p "..." --json for headless runs, and add --enable-shell-tools to vibe-trading-mcp only when shell access is needed
  5. Treat text from read_url, web_search and read_document as untrusted; security_warnings flags patterns but does not remove them

Questions

Which is better for AI agents, OpenAI Codex or Vibe-Trading?

OpenAI Codex scores 73.4 (BB) on agent readiness against Vibe-Trading's 62.2 (B), and leads in 5 of 7 scored categories. Vibe-Trading leads on reliability.

Are OpenAI Codex and Vibe-Trading open source?

Yes. OpenAI Codex is open source (Apache-2.0 (Codex CLI, its Rust crates and the TypeScript and Python SDKs). Codex cloud is a hosted service under OpenAI's terms). Vibe-Trading is open source (MIT).

Other comparisons with OpenAI Codex or Vibe-Trading

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