On 18 October 2026, OpenAI's Codex pricing page lists ChatGPT Plus at $20 a month, Go at $8, and Pro from $100. The API charges per million tokens. This post sets the two side by side using only OpenAI's own pages, and says plainly where OpenAI does not publish the number you would want.
One limit on this post: OpenAI's main chatgpt.com pricing page returned an access error when we fetched it, so the plan details below come from OpenAI's Codex pricing page at learn.chatgpt.com. That page covers coding usage across the plans, not every ChatGPT feature.
What the plans cost
| Plan | Price as published |
|---|---|
| Free | $0 a month |
| Go | $8 a month |
| Plus | $20 a month |
| Pro | From $100 a month, with tiers at $100, $200 and $500 |
| Business | $20 per user a month on annual billing (2 or more users), $25 monthly |
| Enterprise and Edu | Contact sales |
What the usage wording says
The page does not publish token caps. For Plus and standard Business plans it gives estimated local messages per five hours, and says they are "not fixed message limits" and that weekly limits may also apply:
| Model | Estimated messages per five hours |
|---|---|
| GPT-6 Astra | 5 to 45 |
| GPT-6.1 Sol | 15 to 160 |
| GPT-6 Sol | 15 to 150 |
| GPT-6 Luna | 350 to 3,000 |
The ranges are wide because message cost depends on the model, task size and complexity. The page says Pro plans currently have no five hour limit.
The API side
From OpenAI's API pricing page, Standard tier, per million tokens:
| Model | Input | Cached input | Output |
|---|---|---|---|
| gpt-6-astra | $10.00 | $1.00 | $50.00 |
| gpt-6.1-sol | $2.00 | $0.10 | $10.00 |
| gpt-6-luna | $0.10 | $0.01 | $0.50 |
| gpt-5.5 | $5.00 | $0.50 | $30.00 |
Batch is about half of Standard, and the page lists a Fast tier at roughly 2.5x Standard for many models. Prompts above 272,000 input tokens have their own higher rates.
Credits connect the two
The Codex pricing page also uses credits for usage beyond plan limits. Its example rates per million input tokens are 50 credits for GPT-6.1 Sol, 2.5 for GPT-6 Luna and 250 for GPT-6 Astra. Dividing those by the API input prices above gives the same ratio each time, 25 credits per API dollar. OpenAI's page does not state a dollar value per credit in the text we fetched, so treat that ratio as our arithmetic, not a published price.
Try it yourself
This snippet gives the API list price of one session on GPT-6.1 Sol. Replace the token counts with yours.
# gpt-6.1-sol Standard tier, USD per million tokens, from developers.openai.com on 18 Oct 2026
IN, CACHED, OUT = 2.00, 0.10, 10.00
def cost(fresh_in, cached_in, out):
return (fresh_in * IN + cached_in * CACHED + out * OUT) / 1_000_000
c = cost(fresh_in=200_000, cached_in=800_000, out=20_000)
print(round(c, 2), "per session;", round(20 / c, 1), "sessions equal $20")
That tells you what $20 of API spend buys. It does not tell you what Plus includes, because OpenAI publishes message estimates, not tokens.
Quick check
Does OpenAI publish a token limit for Plus?
Not on the page we fetched. It publishes estimated messages per five hours that vary by model and are explicitly not fixed limits.
Sources
- OpenAI Codex pricing and plans, fetched 18 October 2026
- OpenAI API pricing, fetched 18 October 2026
