OpenAI Codex for Open Source

LLM 9.7/10

Reported free ChatGPT Pro and Codex credits for maintainers of public open-source projects, applied via an official OpenAI form.

OpenAI Codex for Open Source scores 9.7/10 for free value in LLM. The main constraint: Reported: free ChatGPT Pro / Codex credits for roughly 6 months — verify current terms, duration, and eligibility on the official form.

Category LLM Kind Open-source grant Caveats Approval is not guaranteed and you must describe a genuine project; the reported ~6-month duration and any credit amounts are approximate, may change, and should be verified on the official OpenAI form before relying on them. Card required No Eligibility open source projects, approval required

Free value score

9.7 / 10

Show the math

Value 10/10

value = 1200 $ one-time

weighted score = 0.7 * 10/10

Model Quality 9.8/10

value = 55 artificial_analysis_score

weighted score = 0.2 * 9.8/10

Volume 7.1/10

value = 106666667 tok/mo

weighted score = 0.1 * 7.1/10

Access 4/10

value = 4/10

score = 4/10

Key metrics

gpt-5.5 55 Best model

$1,200 Credit

No Commercial use OSS maintainer workflows only

Models

6 free · 6 total

Model	Family	AA	Access
gpt-5.5	GPT	54.8	free
gpt-5.4	GPT	51.4	free
gpt-5.3-codex	GPT	44.3	free
gpt-5.3-codex-spark	GPT	44.3	free
gpt-5.2	GPT	42.2	free
gpt-5.4-mini	GPT	40	free

What you get

Reported free ChatGPT Pro / Codex credits

For maintainers of public OSS projects

Applied via official OpenAI form

Approval not guaranteed; verify current limits

Limitations

6-month access window

ChatGPT Pro with Codex is granted for six months only; access does not automatically renew after the period ends.
OSS core maintainer gate

Applicant must be a core maintainer with write access to a widely-used public open-source project; hobbyist or placeholder projects are not eligible.
Manual application and approval

Access is not self-serve — applicants submit an OpenAI form and approval is not guaranteed; OpenAI reviews each case individually.
API credits finite pool

API credits come from the Codex Open Source Fund ($1 M pool); amounts are unspecified per applicant and will not regenerate once the fund is exhausted.
OSS project use only

Benefits are granted specifically for open-source maintainer workflows (PR review, automation, releases); commercial or personal projects are outside the program scope.

Sources

"Selected maintainers receive: 6 months of ChatGPT Pro, which includes Codex; Conditional access to Codex Security; API credits for coding, maintainer automation, release workflows, and core open source work"
https://openai.com/form/codex-for-oss/
"The fund now supports eligible maintainers by offering six months of ChatGPT Pro with Codex and conditional access to Codex Security for core maintainers with write access."
https://developers.openai.com/community/codex-for-oss
"The latest models, including GPT-5.5, GPT-5.4, and GPT-5.3-Codex ... Pro: Choose 5x or 20x higher rate limits than Plus. From $100/month"
https://developers.openai.com/codex/pricing
"GPT-5.4 (xhigh) scores 57 on the Artificial Analysis Intelligence Index, placing it well above average among comparable models (averaging 36)."
https://artificialanalysis.ai/models/gpt-5-4

credits open-source openai

Open service Source ← All LLM