Hard facts side by side: free tiers, prices, limits, SDKs and privacy. Every value links to the official page it came from and is re-checked every week.
| For image gen |  Replicate |  Stability AI |  OpenAI |
|---|---|---|---|
| Free tier | Yes Selected Try for Free models run a limited number of times without a card. Source, Nov 15, 2026 | 25 free credits New accounts created with Google login get 25 free credits, enough for 8 Stable Image Core images. Source, Nov 15, 2026 | Not listed |
| Starting price | $0.000025 per second CPU (Small) hardware, $0.09/hr; many models are priced per output instead. Source, Nov 15, 2026 |
| $0.03 per Core image Credits cost $1 per 100 (1 credit = $0.01). Stable Image Core is 3 credits; Ultra is 8 credits. Source, Nov 15, 2026 |
| $2 per 1M input tokens GPT-6.1 Sol and GPT-6 Sol; $10 per 1M output tokens (GPT-6 Luna from $0.10 input). Source, Nov 15, 2026 |
| Rate limit | 600 predictions per minute Accounts with credit but no payment method: 6 requests per minute. Source, Nov 15, 2026 | 150 requests per 10 seconds Going over returns 429 and blocks requests for 60 seconds. Higher limits by contacting support. Source, Nov 15, 2026 | 5,000 requests/min Build tier ($5 in total credit purchases), GPT-6 Sol; 1,000,000 tokens/min. Source, Nov 15, 2026 |
|---|
| Size limit | 100 MB per input file Local file uploads via client; data URIs recommended only under 1 MB. Source, Nov 15, 2026 | Not listed | 1.05M token context GPT-6 Astra, GPT-6.1 Sol, GPT-6.1 Terra and GPT-6 Luna. Source, Nov 15, 2026 |
|---|
| Storage | Files kept 1 hour API prediction inputs, outputs, files and logs are removed after an hour by default. Source, Nov 15, 2026 | Async results kept 24 hours Results of async jobs (like Creative Upscale) are stored for 24 hours and fetched with the same API key. Source, Nov 15, 2026 | 1 GB free File search storage, then $0.10 per GB per day. Source, Nov 15, 2026 |
|---|
| Official SDKs | PythonJavaScript / TypeScriptGoSwiftSource, Nov 15, 2026 | Not listed | PythonJavaScript / TypeScript |
|---|
| Open source | Partly Cog, the model packaging tool, is open source; the platform is not. Source, Nov 15, 2026 | Not listed | Not listed |
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| Trains on your data | Not listed | Not listed | No API data is not used for training unless you explicitly opt in. Source, Nov 15, 2026 |
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| EU hosting | Not listed | Not listed | Yes Europe (EEA + Switzerland) data residency via eu.api.openai.com for eligible orgs; image support needs approval. Source, Nov 15, 2026 |
|---|
| Compliance | Not listed | Not listed | SOC 2ISO 27001GDPRHIPAASource, Nov 15, 2026 |
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