Opper API alternatives

EU-hosted OpenAI-compatible gateway to 700+ models from 50+ providers, with free models. If it doesn't fit your project, here are the 10 best free Machine Learning APIs to use instead in 2026, out of 58 in the directory.

For reference, Opper API: 100% uptime (30 days) · Callable from the browser (CORS) · HTTPS.

1. 1

   TensorFeed API

   Online · 397 ms

   Real-time AI news, model pricing, service status, and agent activity feeds.

   • No API key needed
   • 100% uptime (30 days)
   • Fast: 397 ms response
   • Callable from the browser (CORS)

   No authHTTPSCORS
2. 2

   AI Economics Tools API

   Online · 1036 ms

   Token cost, LLM energy, agent-hour and Proof-Adjusted Autonomy calculators by Michał Piszczek.

   • No API key needed
   • 100% uptime (30 days)
   • Returns JSON at its URL
   • Callable from the browser (CORS)

   No authHTTPSCORS
3. 3

   Nonobench API

   Online · 679 ms

   Open-source benchmark of how well LLMs solve nonogram puzzles.

   • No API key needed
   • 100% uptime (30 days)
   • Callable from the browser (CORS)
   • HTTPS

   No authHTTPSCORS
4. 4

   Tanvo API

   Online · 373 ms

   Image, video and song generation on 30 AI models (Nano Banana, Kling, Veo, Suno), with a free tier.

   • 100% uptime (30 days)
   • Fast: 373 ms response
   • Callable from the browser (CORS)
   • HTTPS

   apiKeyHTTPSCORS
5. 5

   Modelfax API

   Online · 617 ms

   LLM pricing, context windows and deprecation dates, schema-validated and updated daily.

   • No API key needed
   • 100% uptime (30 days)
   • Callable from the browser (CORS)
   • HTTPS

   No authHTTPSCORS
6. 6S

   Statlyte API

   Online · 503 ms

   Live pricing, context windows and model ids for major LLM APIs.

   • No API key needed
   • 100% uptime (30 days)
   • Callable from the browser (CORS)
   • HTTPS

   No authHTTPSCORS
7. 7

   Cloudmersive API

   Online · 947 ms

   Image captioning, face recognition, NSFW classification.

   • 100% uptime (30 days)
   • Callable from the browser (CORS)
   • HTTPS

   apiKeyHTTPSCORS
8. 8

   Cohere API

   Online · 1145 ms

   NLP API for text generation, embeddings, classification and summarization with a free trial tier.

   • 100% uptime (30 days)
   • Callable from the browser (CORS)
   • HTTPS

   apiKeyHTTPSCORS
9. 9

   DeepAI API

   Online · 760 ms

   Provides AI-powered APIs for text generation, image processing, and more.

   • 100% uptime (30 days)
   • Callable from the browser (CORS)
   • HTTPS

   apiKeyHTTPSCORS
10. 10

    Groq API

    Online · 828 ms

    Fast AI inference API with free tier, supports Llama, Mixtral, Gemma models.

    • 100% uptime (30 days)
    • Callable from the browser (CORS)
    • HTTPS

    apiKeyHTTPSCORS

Opper API vs alternatives

Opper API compared with its alternatives

API	API key	HTTPS	CORS	Uptime	Response	Rating
Opper	Required	Yes	Yes	100%	1242 ms	Not rated
TensorFeed	No	Yes	Yes	100%	397 ms	Not rated
AI Economics Tools	No	Yes	Yes	100%	1036 ms	Not rated
Nonobench	No	Yes	Yes	100%	679 ms	Not rated
Tanvo	Required	Yes	Yes	100%	373 ms	Not rated
Modelfax	No	Yes	Yes	100%	617 ms	Not rated
SStatlyte	No	Yes	Yes	100%	503 ms	Not rated
Cloudmersive	Required	Yes	Yes	100%	947 ms	Not rated
Cohere	Required	Yes	Yes	100%	1145 ms	Not rated

See also: best Machine Learning APIs · all Machine Learning APIs