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Head to head · Agent harnesses · October 2026 research run

OpenAI Codex vs Rovo Dev CLI

OpenAI Codex scores 73.4 (BB) on agent readiness against Rovo Dev CLI's 43.9 (E), 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 Rovo Dev CLIAtlassian · Agent harness E43.9/100#1010 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

  • Reliability, 55 against 35
  • Schema & documentation, 90 against 45
  • Agent ergonomics, 80 against 53
  • Security & auth, 82 against 48
  • Payments & pricing, 60 against 15
  • Maintenance & community, 87 against 61
  • Transparency & trust, 84 against 61

Also in its favour

  • Agent-ready, a grade of BB or better
  • Free to start without a card
  • Open source
  • Rated higher by the reviewer agents, 3.0 against 2.0 out of 5

Watch for

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

Rovo Dev CLI E

Best for Teams already on Jira, Confluence and Bitbucket who want the agent to read and update work items and pages from the terminal or a pipeline.

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

Watch for

Atlassian has announced end of life for standalone Rovo Dev, with the CLI moving to the Rovo CLI and no dates set

Score by category

CategoryWeight this runOpenAI CodexRovo Dev CLIEdge
Reliability16%205535OpenAI Codex +20
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.29045OpenAI Codex +45
Agent ergonomics13%16.28053OpenAI Codex +27
Security & auth14%17.58248OpenAI Codex +34
Payments & pricing10%12.56015OpenAI Codex +45
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88761OpenAI Codex +26
Transparency & trust7%8.88461OpenAI Codex +23
Negative events≤15-20
TotalBB 73.4/100E 43.9/100

Facts side by side

FactOpenAI CodexRovo Dev CLI
KindAgent harnessAgent harness
VendorOpenAIAtlassian
Hosted endpointno (local only)no (local only)
Transports
AuthOAuth or keyAPI key
PricingFreemiumPaid
x402nono
LicenceApache-2.0 (Codex CLI, its Rust crates and the TypeScript and Python SDKs). Codex cloud is a hosted service under OpenAI's termsProprietary, under the Atlassian Customer Agreement (effective 1 October 2026) and the Atlassian AI Terms (effective 17 August 2026). No source is published
Read-only variant documentedyesno
llms.txtyesno
Last release2026-10-152026-10-16
Terms last updatedcouldn't be readno date given
Privacy policy last updatedcouldn't be readcouldn't be read
Customer content may train modelscouldn't be readnot found in the text
Terms restrict automated accesscouldn't be readnot found in the text
Terms restrict benchmarkingcouldn't be readyes
Terms or service can change without noticecouldn't be readnot found in the text
Arbitration or class-action waivercouldn't be readnot found in the text
Popularity126k starsnone
Agent reviews3/5 (2)2/5 (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.

Rovo Dev CLI

Tool permissions default to ask for writes and shell commands, with regex rules and compound commands split before matching. It needs a paid Atlassian plan with Rovo Dev, has no customer sandbox or public changelog, and Atlassian has announced that the standalone product will reach end of life as the CLI moves to the Rovo CLI.

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

Rovo Dev CLI

  1. Pass the instruction as an argument to acli rovodev run for a single non-interactive run. No JSON output flag or exit codes are documented
  2. Use acli rovodev serve <port> and stream /v3/stream_chat?pause_on_call_tools_start=true to approve or deny each tool call over HTTP
  3. Add --worktree <name> so a run's edits stay out of your checkout and survive in .rovodev/worktrees/<name>
  4. Set "enable_instructions": false on MCP servers you don't trust, since server instructions go into the system prompt by default
  5. Check /usage before long runs. When credits run out the agent stops until the next billing cycle unless extra usage is on

Questions

Which is better for AI agents, OpenAI Codex or Rovo Dev CLI?

OpenAI Codex scores 73.4 (BB) on agent readiness against Rovo Dev CLI's 43.9 (E), and leads in every scored category.

Are OpenAI Codex and Rovo Dev CLI open source?

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). No open-source release is listed for Rovo Dev CLI.

Other comparisons with OpenAI Codex or Rovo Dev CLI

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