Ssylphx.ai
Public Beta

The Open AI Gateway

One API. 200+ models. Route traffic across Anthropic, ZAI, and more — with automatic failover, cache affinity, and detailed usage analytics.

quick start
import Anthropic from "@anthropic-ai/sdk"

const client = new Anthropic({
  apiKey: "sk-sx-...",
  baseURL: "https://api.sylphx.ai",
})

const msg = await client.messages.create({
  model: "anthropic/claude-sonnet-4-6",
  max_tokens: 1024,
  messages: [{ role: "user", content: "Hello!" }],
})

console.log(msg.content)

Everything you need to ship AI products

sylphx.ai handles the infrastructure complexity so you can focus on building.

OpenAI-Compatible API

Drop in your existing code. sylphx.ai speaks the same language as OpenAI and Anthropic — switch with a single base URL change.

Prompt Cache Affinity

Requests are intelligently routed to keep your prompts warm in provider-side caches, slashing latency and cost on repeated workloads.

Automatic Failover

If a provider endpoint returns an error or rate-limits you, we automatically retry against the next healthy provider — transparently.

Usage Tracking

Per-key token usage, cost breakdown by model and provider, and latency percentiles — all in your dashboard, updated in real time.

One API Key

Stop managing credentials for a dozen providers. Your sylphx.ai API key is the only secret you need.

Fine-Grained Access

Issue scoped API keys per project, team, or environment. Set rate limits and model restrictions per key.

Top models, one endpoint

Access frontier models from the world's leading AI labs.

GLM-5.1Coding
ZAI
200K ctx
Input

$1.20/MTok

Output

$4.00/MTok

zai/glm-5.1
GLM-5
ZAI
200K ctx
Input

$1.00/MTok

Output

$3.20/MTok

zai/glm-5
Claude Opus 4.6Most Capable
Anthropic
200K ctx
Input

$5.00/MTok

Output

$25.00/MTok

anthropic/claude-opus-4-6
Claude Sonnet 4.6
Anthropic
200K ctx
Input

$3.00/MTok

Output

$15.00/MTok

anthropic/claude-sonnet-4-6
GLM-4.7Value
ZAI
200K ctx
Input

$0.60/MTok

Output

$2.20/MTok

zai/glm-4.7
View all models →

Ready to build?

Get your API key in 30 seconds. No credit card required to start.