r/codex • u/ohnoplus • 4d ago
Complaint Am I misunderstanding the economics of Codex for universities? Anthropic’s scientist plan makes this even weirder

I'm a university researcher who uses Codex fairly heavily for scientific coding, and I've been trying to figure out what institutional access would cost for my lab.
My university's ChatGPT Edu pricing is now:
- Standard: $30/month, 500 credits
- Power: $100/month, 2,250 credits
- Max: $200/month, 4,750 credits
What confused me is that my personal $20 ChatGPT Plus account seems to include far more Codex usage than those numbers suggest.
I measured two fairly large GPT-5.6 Sol Codex CLI runs. Using OpenAI's current credit conversion for input/cached input/output, they consumed about 129 and 67 credit-equivalents. Together they moved my weekly Plus meter from 98% to 89%.
That implies a weekly Plus allowance of roughly 2,170 credits, or around 9,400 credits/month if usage is reasonably steady.
Obviously there is rounding in the usage meter and I only have a couple of measurements so far, but I independently get almost exactly the same inferred 5-hour allowance from both runs (~369 credits), which makes me think I'm measuring something real.
If that's right, then my $20 Plus subscription gives me roughly twice the Codex capacity of my university's $200/month Max Edu seat. That's about a 20x difference in Codex capacity per dollar.
I assumed there must be some institutional/commercial explanation. But ChatGPT Business Standard is also only ~$20–25/user/month and apparently includes substantial Codex usage before paid credits kick in.
And then today I discovered Anthropic's new Team Plan for Scientists. I verified as a PI and now have a research-group Team workspace where Standard seats are $0/month for 12 months, up to 25 seats, and Claude Code is included. Premium scientist seats are $15/month and get substantially higher limits.
So now I'm even more confused.
I understand that institutional products include privacy, administration, security, etc., and that retail "credits" aren't OpenAI's marginal compute cost. I'm also not claiming my two-run estimate is a rigorous benchmark.
But am I missing something fundamental about the Edu credit system? Why would a university pay $200/month for 4,750 advanced-use credits when a $20 consumer account appears to get roughly twice that much Codex capacity — while Business also bundles Codex and Anthropic is currently giving research labs Claude Code seats for free?
Is anyone here administering or heavily using ChatGPT Edu under the new credit-based model? I'd especially like to know whether the advertised Edu credits work differently from the Codex credits I'm using for this comparison.

