Codex provider verdict · snapshot 2026-06-19

How much Codex headroom does ChatGPT Plus/Pro actually buy you?

Plus/Pro is appropriate for interactive Codex work that fits shared rolling ChatGPT plan headroom. API/BYO is safer for bursty, CI, team, programmatic, or spend-controlled workflows.

Local Codex CLI and ChatGPT cloud Codex share ChatGPT plan headroom. OpenAI publishes five-hour estimate ranges and states weekly rolling caps exist, but the exact weekly ceiling is not published here as a number.

Codex pricing · 2026-06-19 Using Codex with ChatGPT plan · 2026-06-19 OpenAI API pricing · 2026-06-19

Evidence before tiers

One shared subscription bucket; an unpublished weekly ceiling.

Interpret Plus and Pro as subscription headroom for local + cloud Codex, not as a guaranteed API-style token allotment.

Shared window

Local + cloud

Codex CLI and ChatGPT cloud Codex draw from ChatGPT plan headroom.

Using Codex with ChatGPT plan · 2026-06-19

Rolling bucket

5 hours

Tier ranges below are five-hour GPT-5.5 message estimates.

Codex pricing · 2026-06-19

Weekly ceiling

Unpublished

A weekly rolling cap exists; no exact weekly number is shown here.

Codex pricing · 2026-06-19

Escape route

API/BYO

Metered API usage is a spend-control decision, not a ChatGPT cap.

OpenAI API pricing · 2026-06-19

Tier evidence

Plus / Pro 5× / Pro 20×, with estimate labels intact.

ChatGPT Plus

GPT-5.5 · ~15–80 GPT-5.5 msgs / 5h (local+cloud shared)

$20.00/mo

estimateshared local + cloudnot a guarantee

5h messages: ~15–80 GPT-5.5; shared estimate
Tokens / mo: 39M; 25,000 tok/msg
Eff. $/M: $0.513/M; price ÷ est. tokens
API equiv.: 13×; derived vs OpenAI API

OpenAI publishes five-hour estimate ranges and a weekly rolling-cap concept, not an exact weekly ceiling to copy here.

Codex pricing Codex by plan Methodology

ChatGPT Pro 5×

GPT-5.5 · ~75–400 GPT-5.5 msgs / 5h

$100/mo

estimateshared local + cloudnot a guarantee

5h messages: ~75–400 GPT-5.5; shared estimate
Tokens / mo: 199M; 25,000 tok/msg
Eff. $/M: $0.502/M; price ÷ est. tokens
API equiv.: 13×; derived vs OpenAI API

OpenAI publishes five-hour estimate ranges and a weekly rolling-cap concept, not an exact weekly ceiling to copy here.

Codex pricing Methodology

ChatGPT Pro 20×

GPT-5.5 · ~300–1600 GPT-5.5 msgs / 5h

$200/mo

estimateshared local + cloudnot a guarantee

5h messages: ~300–1600 GPT-5.5; shared estimate
Tokens / mo: 780M; 25,000 tok/msg
Eff. $/M: $0.256/M; price ÷ est. tokens
API equiv.: 26×; derived vs OpenAI API

OpenAI publishes five-hour estimate ranges and a weekly rolling-cap concept, not an exact weekly ceiling to copy here.

Codex pricing Methodology

Subscription vs API/BYO

The risk model changes at the quota wall.

Subscription headroom

Fixed price, quota-wall risk

Choose ChatGPT Plus/Pro Codex when work is interactive. The upside is predictable monthly spend; the downside is rolling-limit drain across the shared local + cloud Codex bucket.

Using Codex with ChatGPT plan · 2026-06-19

OpenAI API / BYO

Metered spend, explicit controls

Choose API/BYO when work is bursty, CI-driven, team-distributed, programmatic, or needs spend attribution. ChatGPT subscription rolling caps are not the API risk.

OpenAI API pricing · 2026-06-19

Choose Codex subscription when…

Interactive Codex headroom is the thing you are buying.

You mostly run local CLI or ChatGPT cloud Codex in human-paced loops.
A shared rolling window is acceptable because monthly price is predictable.
You can pause or defer work when the ChatGPT plan wall appears.

Use API/BYO instead when…

A hidden ceiling would stop work at the wrong time.

CI, batch refactors, agents, or scheduled jobs need to keep running.
Teams need spend controls, attribution, or programmable routing.
Your buyer question is what a run costs, not how much interactive headroom a plan has.

Source receipts

Compact dated receipts for the decisive claims.

Date	Source	Claim used	Label	Link
2026-06-19	OpenAI Codex pricing	ChatGPT Plus is $20/mo with an estimated ~15–80 GPT-5.5 messages per 5 hours; ChatGPT Pro 5× is $100/mo with ~75–400; ChatGPT Pro 20× is $200/mo with ~300–1600.	official price + range	open source
2026-06-19	OpenAI ChatGPT plan help	Local Codex CLI and ChatGPT cloud Codex usage share ChatGPT plan headroom; treat the five-hour window as one shared local + cloud bucket.	official plan mechanics	open source
2026-06-19	OpenAI Codex pricing	Weekly rolling caps exist for Codex subscription usage, but the exact weekly ceiling is not published; this page does not invent one.	unpublished cap	open source
2026-06-19	OpenAI API pricing	OpenAI API/BYO usage is metered separately by API pricing, making spend control the risk model instead of a ChatGPT subscription quota wall.	metered API escape	open source