Best AI API Gateway 2026: Riven vs OpenRouter vs Together AI vs OpenAI
# Best AI API Gateway 2026: Riven vs OpenRouter vs Together AI vs OpenAI
If you are building with LLMs in 2026, you have a choice: manage individual API keys for every provider — or use a unified gateway that gives you one endpoint, one bill, and access to every model.
We compared the four most popular options on the metrics that matter: model count, pricing, routing, developer experience, and platform features.
The contenders
| Platform | Models | Endpoint | Pricing model | Free tier | |----------|--------|----------|---------------|-----------| | Riven | 75+ | OpenAI-compatible | Per-token PAYG + subscription | 300 credits/mo | | OpenRouter | 300+ | OpenAI-compatible | Per-token (markup varies) | Limited | | Together AI | 200+ | OpenAI-compatible | Per-token | $5 credit | | OpenAI | 15+ | Native | Per-token | None |
Model coverage
OpenRouter wins on raw model count (300+), but many are duplicates or niche fine-tunes. Riven covers 75+ frontier and mid-tier models from every major provider. Together AI focuses on open-weight models with fast inference.
The practical difference: Riven includes both proprietary and open-weight models behind one key. OpenRouter does too, but at a markup. Together AI is open-weights only. OpenAI is OpenAI only.
Pricing
Riven offers the most complete pricing ladder in the space:
| Plan | Price | Credits | |------|-------|---------| | Free | $0 | 300/mo | | Pro | $15/mo ($12.50/mo annual) | 1,500/mo | | Max 5x | $100/mo | 10,000/mo | | Max | $200/mo | Highest personal tier | | Business | $25/seat/mo | Shared workspaces | | Max Team | $325/seat/mo | Max scale per seat | | Enterprise Max | Custom | Federated identity, audit |
Pro includes 1,500 Computer credits, unlimited chat, Deep Research, and 1M API PAYG tokens per month. That is $5/mo cheaper than Perplexity Pro or ChatGPT Plus, with more model coverage and a full developer API included.
For API-only users, Rivens PAYG starts at $1 with no subscription. No minimum spend requirements.
OpenRouter charges per-token with a variable markup (typically 5-15% over provider cost). Together AI has competitive per-token pricing but only for open models. OpenAIs pricing is set by them — no discounts.
Routing intelligence
Rivens ultra-router is the standout feature. Instead of manually picking a model for each request, the ultra-router analyzes the prompt and automatically selects the best model based on capability, cost, and latency. You can also pin specific models if you prefer.
OpenRouter has a route feature but it is primarily cost-based — it picks the cheapest provider for a given model, not the best model for a given task.
Together AI and OpenAI do not offer automatic model routing — you specify the model in each request.
Developer experience
All four platforms offer OpenAI-compatible endpoints, meaning you can switch by changing your base URL. But the DX beyond that varies:
Riven includes a full developer console (Code surface), API key management, usage analytics, and team governance. The platform also includes chat, agents, research, and image generation — all sharing the same credits and login.
OpenRouter is API-only. No chat interface, no agents, no code console. It is purely a routing layer.
Together AI offers fine-tuning and hosted inference but no consumer-facing chat or agent platform.
OpenAI has the best-documented API and the largest ecosystem, but you are locked into their models only.
When to pick which
Pick Riven if: You want one platform for chat, code, agents, AND API access. You want the best price-to-model ratio. You want automatic model routing. You want both proprietary and open-weight models.
Pick OpenRouter if: You need access to obscure or fine-tuned models not available elsewhere. You are purely an API consumer and do not need a chat/agent platform.
Pick Together AI if: You are primarily using open-weight models and want fast, cheap inference. You need fine-tuning capabilities.
Pick OpenAI if: You only need OpenAI models and want the most mature ecosystem.
The bottom line
For most developers and teams in 2026, a unified gateway makes more sense than managing multiple provider relationships. Riven offers the best combination of model coverage, pricing, routing intelligence, and platform features — especially if you want a single platform that serves both your development and productivity needs.
Start free at rivenai.io — 300 credits/month, no card required. API access starts at $1.