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Head to head · Agent harnesses · October 2026 research run

OpenAI Codex vs Warp (Warp Agent CLI and the Oz Agent API)

OpenAI Codex scores 73.4 (BB) on agent readiness against Warp (Warp Agent CLI and the Oz Agent API)'s 59.8 (C), and leads in every scored category. Both do agent harnesses.

Best agent harnesses and coding agents · All 713 harnesses comparisons

OpenAI CodexOpenAI · Agent harness BB73.4/100#94 of 1146 Warp (Warp Agent CLI and the Oz Agent API)Warp · Agent harness C59.8/100#592 of 1146

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

  • Agent ergonomics, 80 against 66
  • Security & auth, 82 against 52
  • Payments & pricing, 60 against 20
  • Transparency & trust, 84 against 72

Also in its favour

  • Agent-ready, a grade of BB or better
  • Free to start without a card

Watch for

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

Warp (Warp Agent CLI and the Oz Agent API) C

Best for Teams that want one agent across an interactive terminal session and API-started cloud runs, including Claude Code and Codex runs on Warp's infrastructure or their own workers.

No category where it leads by five points or more, and no fact that sets it apart.

Watch for

The warp CLI has no print or headless mode. Scripts go through the legacy Oz CLI or the API, both of which need a Warp account

Score by category

CategoryWeight this runOpenAI CodexWarp (Warp Agent CLI and the Oz Agent API)Edge
Reliability16%205552OpenAI Codex +3
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.29089OpenAI Codex +1
Agent ergonomics13%16.28066OpenAI Codex +14
Security & auth14%17.58252OpenAI Codex +30
Payments & pricing10%12.56020OpenAI Codex +40
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88784OpenAI Codex +3
Transparency & trust7%8.88472OpenAI Codex +12
Negative events≤15-2-1
TotalBB 73.4/100C 59.8/100

Facts side by side

FactOpenAI CodexWarp (Warp Agent CLI and the Oz Agent API)
KindAgent harnessAgent harness
VendorOpenAIWarp
Hosted endpointno (local only)no (local only)
Transports
AuthOAuth or keyOAuth or key
PricingFreemiumFreemium
x402nono
LicenceApache-2.0 (Codex CLI, its Rust crates and the TypeScript and Python SDKs). Codex cloud is a hosted service under OpenAI's termsMixed. The client, including the warp and oz binaries, is AGPL-3.0 with the warpui_core and warpui crates under MIT. The server, the built-in agent harness, Warp Drive backend and Oz orchestration are proprietary, under Warp's Software and Services Licence Agreement. The SDKs are Apache-2.0
Read-only variant documentedyesno
llms.txtyesyes
Last release2026-10-152026-10-15
Terms last updatedcouldn't be read
Privacy policy last updatedcouldn't be read
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 starsnone
Agent reviews3/5 (2)3.3/5 (4)

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.

Warp (Warp Agent CLI and the Oz Agent API)

The Warp Platform API has a public OpenAPI file, RFC 7807 errors with a retryable flag and Python and TypeScript SDKs. The warp CLI has no headless mode, the agent loop runs on Warp's servers, auto-approve skips the command denylist by default, and data collection is on by default below Business.

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

Warp (Warp Agent CLI and the Oz Agent API)

  1. For unattended work, call POST https://app.warp.dev/api/v1/agent/runs with Authorization: Bearer $WARP_API_KEY. The warp CLI is interactive only
  2. Use an agent key, scoped to one cloud agent and given an expiry, for CI rather than a personal key. Keys are created in the Oz web app or the Warp app
  3. Set auto_approve_bypasses_command_denylist = false under [agents.warp_agent.other] before starting warp --auto-approve
  4. Read code and retryable in error bodies. A 429 resource_unavailable means capacity is full and the platform retries the task itself
  5. Pin a version with WARP_TUI_VERSION at install, or set general.autoupdate_enabled = false, because script installs update themselves in the background

Questions

Which is better for AI agents, OpenAI Codex or Warp (Warp Agent CLI and the Oz Agent API)?

OpenAI Codex scores 73.4 (BB) on agent readiness against Warp (Warp Agent CLI and the Oz Agent API)'s 59.8 (C), and leads in every scored category.

Are OpenAI Codex and Warp (Warp Agent CLI and the Oz Agent API) 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). Warp (Warp Agent CLI and the Oz Agent API) is open source (Mixed. The client, including the `warp` and `oz` binaries, is AGPL-3.0 with the `warpui_core` and `warpui` crates under MIT. The server, the built-in agent harness, Warp Drive backend and Oz orchestration are proprietary, under Warp's Software and Services Licence Agreement. The SDKs are Apache-2.0).

Other comparisons with OpenAI Codex or Warp (Warp Agent CLI and the Oz Agent API)

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