OpenAI API – Model Access & GPT-5 Enablement Guide

1. Is there a Free Tier to test OpenAI API?

No. There is NO free tier for OpenAI API.

Important clarification:

• ChatGPT (website/app) ≠ OpenAI API
• Even if someone uses ChatGPT for free or has ChatGPT Plus, API usage is always paid
• New OpenAI API accounts do not receive free credits

What is free?

• Only listing models (/v1/models) is free
• Generating responses (/v1/responses) is always paid

Conclusion:
👉 There is no free testing tier for OpenAI API.

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2. Where to buy OpenAI API access?

OpenAI API access is purchased via billing setup, not a separate product.

Steps to buy API access:

1. Create OpenAI account
2. Go to OpenAI Platform → Billing
3. Add credit/debit card
4. Enable pay-as-you-go
5. Generate an API key

Once billing is enabled:

3.If API is already purchased, how to verify it is PAID?

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✅ COMMANDS TO CHECK IF OPENAI API IS PAID

Platform: Windows CMD
Requirement: OPENAI_API_KEY must be set

set OPENAI_API_KEY=sk-xxxxxxxxxxxxxxxx

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✅ Command 1 (MOST IMPORTANT): Paid API Verification Test

This is the definitive test.

curl https://api.openai.com/v1/responses ^
  -H "Authorization: Bearer %OPENAI_API_KEY%" ^
  -H "Content-Type: application/json" ^
  -d "{ \"model\": \"gpt-4.1-mini\", \"input\": \"hi\", \"max_output_tokens\": 16 }"

✅ If API is PAID → You will see:

"status": "completed",
"billing": {
  "payer": "developer"
},
"usage": {
  "total_tokens": 18
}

❌ If API is NOT PAID → You will see:

"code": "insufficient_quota"

📌 Manager takeaway:
✔ payer: developer = PAID API

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✅ Command 2: Token Charging Proof

Run the same command again and look for:

"usage": {
  "input_tokens": X,
  "output_tokens": Y,
  "total_tokens": Z
}

📌 Why this proves payment

• Tokens are counted only for paid requests
• Free / unpaid API calls never consume tokens

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❌ Command 3 (Common Mistake): This DOES NOT Prove Payment

curl https://api.openai.com/v1/models ^
  -H "Authorization: Bearer %OPENAI_API_KEY%"

Why this is NOT valid proof:

• This endpoint is free
• Works even without billing
• Lists models only

📌 Never use /v1/models to verify payment

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✅ Command 4: Billing Capability Check (Behavior Test)

curl https://api.openai.com/v1/responses ^
  -H "Authorization: Bearer %OPENAI_API_KEY%" ^
  -H "Content-Type: application/json" ^
  -d "{ \"model\": \"gpt-4.1-mini\", \"input\": \"test\" }"

Result meaning:

Response	Meaning
Response generated	API is PAID
insufficient_quota	API NOT paid / no balance
invalid_api_key	Key problem

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🧾 FINAL VERIFICATION CHECKLIST

Check	Expected
Command 1 returns completed	✅
Response shows payer: developer	✅
Tokens are counted	✅
GPT-4.1-mini responds	✅

✅ Final conclusion:

The OpenAI API key is PAID and BILLING IS ACTIVE

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🚨 IMPORTANT NOTES (Executive Level)

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4. Why only GPT-4.1 (or earlier) models are working?

This is NOT a bug and NOT a billing issue.

OpenAI uses tier-based model access.

Current state:

• gpt-4.1-mini → ✅ Works
• gpt-5, gpt-5-mini, gpt-5.2 → ❌ Not working

Error shown:

insufficient_quota

What this really means:

• The API key is valid
• Billing is active
• Account tier does not yet allow GPT-5 models

This is common for:

• New accounts
• Low historical spend
• Short billing history

Conclusion:
👉 GPT-4.1 works because it is allowed in the current account tier.

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5. Why GPT-5 / GPT-5.2 is not working?

GPT-5 models are restricted to higher trust tiers.

They are unlocked automatically based on:

• Account age
• Paid usage history
• Total spend
• Stable, non-abusive usage patterns

There is:

• ❌ No “Enable GPT-5” button
• ❌ No manual approval request
• ❌ No shortcut

This is OpenAI’s security and cost-control policy.

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6. How to unlock GPT-5 / GPT-5.2 (Official & Practical Method)

Step 1: Use allowed models consistently

Use:

• gpt-4.1-mini (currently enabled)

Daily real usage:

• Content generation
• Summaries
• Blog sections
• Internal tools

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Step 2: Build paid usage history

Recommended pattern:

• 300–1000 API requests per day
• Spread across the day (not bursts)
• Real prompts (not repeated spam)

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Step 3: Increase billing limits

In OpenAI Billing Dashboard:

• Set Monthly limit: $50–$100
• Set Alert threshold: 80%

This does not mean spending all money, but signals readiness for higher tiers.

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Step 4: Wait for automatic tier upgrade

Typical unlock timeline:

• 2–7 days for active paid usage
• Sometimes faster if spend reaches ~$50+

Once unlocked:

• gpt-5-mini works first
• Then gpt-5
• Then gpt-5.2

No code changes required.

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7. How to check which models are supported by our API key?

There is NO dashboard or API endpoint that shows “allowed models”.

The only valid method:

• Make a small test request to the model
• Observe the result

Interpretation:

Result	Meaning
Response completed	Model supported
insufficient_quota	Model exists but tier locked
model_not_found	Wrong model name
invalid_api_key	Key problem

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8. Recommended Production Strategy (Best Practice)

Use auto-fallback logic:

1. Try gpt-5.2
2. If blocked → try gpt-5
3. If blocked → try gpt-5-mini
4. If blocked → use gpt-4.1-mini

This ensures:

• System works today
• Automatically upgrades when GPT-5 unlocks
• No redeployment needed later

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9. Final Summary

• ✅ OpenAI API is paid only
• ❌ No free tier exists for API testing
• ✅ Our API key is active and billed
• ✅ GPT-4.1 works because our tier allows it
• ❌ GPT-5 / 5.2 are blocked due to account tier
• ✅ Unlock happens automatically with usage + spend
• ❌ No manual enablement possible
• ✅ Best current approach: use GPT-4.1-mini + auto-fallback

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Add the following environment variables to your Laravel .env file:

OPENAI_API_KEY=XXXXXXXXXXXXXXXXXXXXXXX
OPENAI_MODEL=gpt-4o-mini