Searches like https openrouter ai api v1 chat/completions show developers want one HTTP shape that reaches many model vendors. OpenRouter is the popular aggregator for that pattern.
What OpenRouter does
OpenRouter exposes an OpenAI-compatible chat completions URL. You:
1. Create an account and fund credits or billing.
2. Send model ids that map to third-party hosts (OpenAI, Anthropic, open models, etc.).
3. Pay OpenRouter's marked-up $/M or per-request fees.
Pros
- Fast model switching without rewriting client code
- Single invoice for experiments
- Easy A/B tests across SKUs
Cons
- Another party in the data path — read their privacy terms
- Markups vs direct vendor pricing at scale
- Support boundaries blur when a model fails
Review provider data sharing.
OpenRouter vs direct APIs
| OpenRouter | Direct OpenAI / Google / Anthropic |
|---|---|
| Speed to try many models | Best enterprise contracts & SLAs |
| Unified SDK | Native feature rollout (tools, audio) |
OpenRouter vs flat multi-model APIs
Aggregators still meter tokens. If traffic is steady, compare:
- OpenRouter monthly spend projections
- Daymora flat $25/month with GPT-5, Claude Sonnet 4, and Gemini 2.5 Pro
- Flat-rate worth it?
Implementation note
Point your OpenAI SDK at OpenRouter's base URL and pass their API key. Keep routing logic server-side — never expose aggregator keys in browsers (key management).
Bottom line
OpenRouter AI API is excellent for routing experiments. For production economics, spreadsheet direct vs aggregator vs flat-rate once monthly usage stabilizes.