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Chat Completions

POST /v1/chat/completions — the OpenAI wire format across every text and code model, with streaming and exact usage.

Endpoint

Standard OpenAI request and response shapes — messages in, choices out. Existing OpenAI SDK code works unchanged after swapping the base URL and key.

POST https://api.companyfabric.com/v1/chat/completions

Streaming

Set stream: true for server-sent events. Delta chunks arrive in the OpenAI format; the final chunk before [DONE] carries the usage object including cost_usd — read it to reconcile spend without a second request.

const completion = await client.chat.completions.create({
  model: "anthropic/claude-sonnet-4-5",
  messages: [{ role: "user", content: "Stream me." }],
  stream: true,
})
for await (const chunk of completion) {
  process.stdout.write(chunk.choices[0]?.delta?.content ?? "")
  if (chunk.usage) console.error("cost:", chunk.usage.cost_usd)
}

Request tracing

Every response carries an x-fabric-request-id header. Include it when reporting an issue — it links your request to the exact ledger row and upstream trace.