Free AI platform comparison

OpenAI vs ChatGPT (OpenAI): Free Tier and API

OpenAI vs ChatGPT (OpenAI) is a practical comparison for developers choosing an AI platform with usable free access. OpenAI offers ChatGPT free tier unlimited on the free tier, while ChatGPT (OpenAI) offers Limited requests/day on the free tier. For API usage, OpenAI includes $5 with a 3 RPM (free tier) limit, and ChatGPT (OpenAI) does not advertise a free API plan. This page compares the two tools across free tier, free API, rate limits, open-source availability, model coverage, and GitHub traction, then gives a quick recommendation so you can decide whether to test OpenAI, ChatGPT (OpenAI), or both.

Quick decision

OpenAI vs ChatGPT (OpenAI): pricing, free API, and limits

Quick answer: choose OpenAI if its free tier, model family, or ecosystem fits your app better; choose ChatGPT (OpenAI) if it gives better free API credits, pricing, or access for your workflow. This comparison focuses on free tier, API pricing, limits, setup, and practical alternatives.

Free tierOpenAI: ChatGPT free tier unlimited · ChatGPT (OpenAI): Limited requests/day
Free API$5 vs No
Best checkCredits, rate limits, setup friction
DecisionTest both if rank, latency, or access matters
OpenAI detailsFree tier, API credits, limits and setupChatGPT (OpenAI) detailsFree tier, API credits, limits and setupFree AI API directoryCompare all free credits and limits
👑OpenAI

OpenAI

70pts
1 wins
VS
ChatGPT (OpenAI)

ChatGPT (OpenAI)

55pts
1 wins

🏆 Overall, OpenAI offers more free value (1/6 categories)

📊 Side-by-Side

Category
OpenAI
ChatGPT (OpenAI)
Free Tier
✅ ChatGPT free tier unlimited
✅ Limited requests/day
Free API
✅ $5
❌ None
Rate Limit
3 RPM (free tier)
N/A
Open Source
❌ No
❌ No
Free Models
3
6
GitHub Stars
-
-

🧠 Model Details

OpenAI3 models
GPT-5.2
📐 128k⚡ 80 RPM
Latest flagship model, strong multimodal capabilities
GPT-5.4 mini
📐 128k⚡ 200 RPM
Lightweight fast model, cost-effective
GPT Image 2
📐 N/A⚡ 50 RPD
Latest image generation model
ChatGPT (OpenAI)6 models
GPT-5.5
📐 1000k⚡ Plus/Pro only
Released April 2026, smartest model, major upgrade for coding/research/analysis. API $5/M input, $30/M output
GPT-5.5-Cyber
📐 1000k⚡ Trusted Access / enterprise-limited
GPT-5.5 variant for trusted-access cybersecurity use cases, including security evaluation, vulnerability analysis, and defensive workflows; availability is gated through OpenAI trusted access.
GPT-5.5 Pro
📐 1050k⚡ Pro only
Deep reasoning variant for complex high-stakes tasks. API $30/M input, $180/M output
GPT-5.4
📐 128k⚡ Plus/Pro
Previous flagship, still powerful
GPT-4o mini
📐 128k⚡ Rate limited
Available to free users, fast
GPT-4o
📐 128k⚡ Very limited
Very limited for free users

🎯 Which should you choose?

Choose OpenAI if…

you want ChatGPT free tier unlimited on the free tier, plus $5 for API tests.

Choose ChatGPT (OpenAI) if…

you want Limited requests/day on the free tier.

FAQ

Which is better, OpenAI or ChatGPT (OpenAI)?

OpenAI scores higher in this free-tier comparison because it wins more of the measured categories. Still, the best choice depends on your exact needs: free chat access, API credits, open-source models, or rate limits.

Does OpenAI have a free tier?

Yes. OpenAI lists ChatGPT free tier unlimited for free users.

Does ChatGPT (OpenAI) have a free tier?

Yes. ChatGPT (OpenAI) lists Limited requests/day for free users.

Which one is better for API experiments?

OpenAI offers $5; ChatGPT (OpenAI) has no clearly listed free API credits. Choose the option with enough credits and rate limits for your prototype.

View OpenAI →View ChatGPT (OpenAI) →
🐑 小羊助手