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Routing is crowded. A baseline count is the open ground.
Routers such as OpenRouter and Not Diamond already route across providers. Parezen switches a route only after a cheaper model matches quality on your own replayed requests, then counts the saving against your own baseline and checks it against your provider bill. This page does not quote competitor prices.
OpenRouter
Stripe agreed to acquire it, August 2026. Model router and marketplace.
Portkey
AI gateway.
Langfuse
Acquired by ClickHouse, January 2026. Open-source LLM observability.
Arize
Acquired by Dynatrace, completed 1 October 2026. AI observability.
LiteLLM
Independent open-source gateway. Core is free.
Ascerta
Enterprise AI cost and value tracking. Raised an $18M Series A on 30 September 2026.
Cloudflare and Datadog also ship gateway or cost features inside larger platforms. Dated notes below are from 25 September 2026 and do not claim a competitor’s current price list. Provider and company names are not customers.
| Question | Parezen |
|---|---|
| Counted against your own baseline? | Yes. A saving is estimated first, realised once measured on your traffic, and verified when the month's ledger is within 2% of your provider bill. Only verified savings are billed. |
| Guarantee | If we don't save you more than we charge, you pay nothing that month. That sentence is the monthly savings share only, judged on savings after the cost of quality checks. It does not apply to the usage fee. The fee is capped at 5% of the pre-change AI spend of the workloads we optimise (measured in your savings forecast). No spend-band platform fee. |
| Cost per task | Part of FinOps: tag a request with the task it serves and see the cost of each successful task, not only cost per token. |
| Privacy | Metadata only by default. Content logging is off unless a workspace turns it on, with a retention period. Parezen runs the gateway at api.parezen.com. |
What to ask any gateway
- Do they count a saving against your own baseline, or only estimate it?
- Is there a month where you pay nothing if the saving does not beat the fee?
- Can finance see cost per successful task, not only cost per token?
- Are prompts and responses off by default, and logged only where you turn it on?
- OpenRouter
Dated notes. No invented feature matrix.
- LiteLLM
Dated notes. No invented feature matrix.
- Portkey
Dated notes. No invented feature matrix.
- Helicone
Dated notes. No invented feature matrix.
- Cloudflare
Dated notes. No invented feature matrix.
- Vercel
Dated notes. No invented feature matrix.
- Kong
Dated notes. No invented feature matrix.