Invite-only beta is live

One API for
every model.

Sincere.dev routes every request to the best model for the job — by quality, latency, or cost — and generates text, images, audio, and video at scale. Swap providers without changing a line of code.

Request access View the API

router — live trafficstreaming

time	routed to	decision	latency	cost
12:04:01.212	claude-fable-5	best_quality	398ms	$0.0062
12:04:01.480	gpt-5.6-sol	policy: pro-tier	441ms	$0.0074
12:04:01.733	gpt-5.6-luna	best_price	212ms	$0.0008
12:04:02.101	claude-haiku-4-5	fallback: timeout	186ms	$0.0009
12:04:02.386	flux-2-pro	media: image	1.1s	$0.0300

410ms

p50 latency

99.99%

uptime

120+

models routed

38%

avg. cost saved

Route across every major provider

OpenAIAnthropicGoogleMetaMistralDeepSeekBlack Forest LabsElevenLabsRunwayCoherexAIOpenAIAnthropicGoogleMetaMistralDeepSeekBlack Forest LabsElevenLabsRunwayCoherexAI

Platform

Everything between your app and the models

Consistent APIs, strong guarantees, and practical controls — so shipping AI to production feels boring, in the best way.

Policy-driven LLM routing

Declare what matters — quality, latency, or cost — and the router picks the optimal vendor and model per request. Automatic fallbacks, A/B tests, and shadow traffic included.

policy checkout-flow {

objective: best_quality

fallback: on timeout > 2s → claude-haiku-4-5

ab_test: 10% gpt-5.6-sol vs claude-sonnet-5

}

Multimodal generation

Four modalities, one SDK, budget-aware model selection.

Text & chat120+ models
Imagesup to 4K
Audio & voice40+ voices
Video4K · 60fps

Unified interface

One API across providers. Swap vendors without touching your app code.

Enterprise-ready

RBAC, SSO, audit logs, and region controls for compliance from day one.

Deep observability

Metrics, logs, and distributed traces for every request, streamed live.

Price / performance

Smart routing, caching, and autoscaling cut TCO without quality loss.

How it works

Request to response in three steps

Send

Call one consistent API with your prompt or media spec — SDK or REST, streaming by default.

Route

The router applies your policy and live provider telemetry to pick the optimal model, with instant fallbacks.

Deliver

Results stream back with full metrics, logs, and traces attached — every request fully observable.

Developer experience

One client. Every modality.

Text and media across every provider — with routing, budgets, and observability built into the same call.

main.ts

1import { Sincere } from "@sincere/sdk";
2
3const client = new Sincere({ apiKey: process.env.SINCERE_API_KEY });
4
5// Chat — routed by your policy
6const chat = await client.chat.generate({
7  prompt: "Summarize this document.",
8  routing: {
9    objective: "best_quality",
10    fallbackTimeoutMs: 2000,
11    abTest: { percent: 10, a: "gpt-5.6-sol", b: "claude-sonnet-5" },
12  },
13});
14
15// Media — same client, same key
16const image = await client.media.image({
17  prompt: "A calm, minimalist workspace in natural light",
18  size: "2048x2048",
19});

FAQ

Common questions

Get early access

We're onboarding teams gradually to keep the experience great. Tell us what you're building.

One API forevery model.