ToolScore

OpenAI Codex

OpenAI · ai coding agents · Source: data snapshot · data as of 2026-09-16

OpenAI's terminal + cloud agent: strong reasoning, open-source CLI, and the same $20-tier squeeze as its rivals.

71/100 Get it →
Real price
$20/mo
subscription
BYOK (own key)
Yes ✓
The CLI is open-source and runs against your OpenAI API key (pay-per-token); the ChatGPT-integrated experience
Limits
5.5/10
$20 Plus (small credit) · $200 Pro · API per-token · OSS CLI free
Verdict
STRONG
ChatGPT plans meter Codex through credit windows that reset periodically; API mode uses standard OpenAI rate l

ToolScore breakdown — why 71/100

Price / Value
6.5
Token & Rate Limits
5.5
Speed / Latency
8.0
Privacy & Retention
5.5
BYOK (Own API Key)
8.0
Output Quality
9.0
Stability
7.0
Ease of Setup
8.0
Billing Transparency
6.0
Support & Community
7.5

10 criteria × 10 points. Low pillars are visible on purpose — that's the point of a score you can audit. Methodology →

✅ What it does well

  • ▸Frontier reasoning quality — near the top of every agentic coding benchmark
  • ▸Cloud agent mode: hand it a task, get a reviewed pull request
  • ▸Open-source CLI with clean BYOK path via your API key
  • ▸Sandboxed execution is a genuinely thoughtful security model

⚠️ Where it costs you

  • ▸Serious usage means $200/mo or API spend — Plus credits evaporate quickly
  • ▸Credit windows reset on their own schedule, not your deadline's
  • ▸OpenAI-only: no provider routing

Hidden traps — the stuff the pricing page doesn't say

medium riskCloud tasks burn credits quietly

Asynchronous cloud runs keep consuming credits while you're on another tab — a queue of parallel tasks is an easy way to drain a plan. Watch the activity feed on batch days.

low riskAPI-tier rate limits gate the good mode

The BYOK route is throttled by your OpenAI org's rate tier; fresh keys start low and upgrade with spend history. Heavy day-one use needs planning (or a pre-warmed org).

Try OpenAI Codex

Know the limits before you pay: read the traps above, then decide with eyes open.

Visit official site →

Affiliate link where available — never affects the score.

⚠️ What the advertised price hides
$20 Plus includes modest agent credit; real agent workloads push toward Pro ($200) or API billing.
Sources & freshness

Data as of 2026-09-16. Prices and limits change monthly — report anything stale. How we verify: methodology.

Closest alternatives

GitHub Copilot 71.5/100

The corporate default: predictable per-seat pricing, boring in the best way — and the free tier fina
Claude Code 73/100

The quality benchmark for terminal coding agents — best-in-class output with 2nd-gen token economics
Cline 76.5/100

Open-source VS Code agent with BYOK transparency — powerful, but famous for eating tokens by design.

OpenAI Codex review

In-depth analysis · last updated 2026-09-16

The reasoning specialist

Codex is OpenAI's agent stack rebuilt for 2025+: an open-source terminal CLI, an IDE extension, and a cloud agent that takes a task, works in a sandbox, and returns a reviewed pull request. On hard reasoning-heavy tasks it sits near the top of the class (quality 9/10) — with speed and sandboxing as genuine differentiators.

The same ladder, different brand

Economically it mirrors its biggest rival: $20/mo Plus includes a taste of agent credits, while real usage points you at $200/mo Pro or the API. Credit windows reset on OpenAI's schedule; queues of parallel cloud tasks drain them faster than most people expect — the classic trap of a metered resource that feels unlimited.

The open-source escape hatch

The CLI itself is open source and runs on your API key, which is why BYOK scores 8/10: you can bypass subscription ceilings entirely and pay per token — subject to your org's rate tier.

Verdict

71/100, Strong. Pick it when the bottleneck is reasoning difficulty rather than volume; check the credit math before you commit a sprint to it.