# Celeris

> Celeris is an OpenAI-compatible inference API for celeris-1, a diffusion
> LLM tuned for fast, short, structured responses (classification, extraction,
> judging, query rewriting) with latency in the tens of milliseconds.

- Console: https://console.cloud.celeris.ai
- Docs: https://docs.celeris.ai

## Docs

- [Quickstart](https://docs.celeris.ai/quickstart.md): Create an API key and make your first Celeris request in about five minutes.
- [Authentication](https://docs.celeris.ai/authentication.md): How Celeris API keys work — creating, sending, rotating, and revoking them.
- [Models](https://docs.celeris.ai/models.md): The celeris-1 model, what it is built for, and how model routing works.
- [Making requests](https://docs.celeris.ai/making-requests.md): OpenAI compatibility, supported parameters, browser calls, and response behavior.
- [Errors](https://docs.celeris.ai/errors.md): Every error the API returns — status, body, causes, and how to handle each one.
- [Rate limits](https://docs.celeris.ai/rate-limits.md): What's limited, 429 handling, and how to back off well.
- [Prompt engineering](https://docs.celeris.ai/prompting.md): How to prompt a diffusion LLM for short, structured, reliable outputs.
- [Agentic workloads](https://docs.celeris.ai/agentic-workloads.md): Request patterns celeris-1 is built for — classify, extract, judge, and rewrite inside agent loops.
- [Measuring latency](https://docs.celeris.ai/measuring-latency.md): Use the Server-Timing header to separate server processing from network latency.
- [Going to production](https://docs.celeris.ai/going-to-production.md): A production-readiness checklist for keys, retries, timeouts, concurrency, observability, and billing.
- [Console & billing](https://docs.celeris.ai/console.md): The Customer Console — API keys, the Playground, usage, credits, Commercial access, and your team.
- [Account & sign-in](https://docs.celeris.ai/account.md): Signing up, verification codes, password resets, workspace invites, and what to do when an email doesn't arrive.
- [Pricing](https://docs.celeris.ai/pricing.md): Token rates, what is and isn't charged, estimating costs, and how prepaid credits work.
- [Security and data handling](https://docs.celeris.ai/security.md): How Celeris protects API credentials, separates workspaces, and records usage.
- [Glossary](https://docs.celeris.ai/glossary.md): The terms used across Celeris — the model, the API, the Console, and billing.
- [Troubleshooting & support](https://docs.celeris.ai/support.md): Diagnose common failures fast, and what to include when you contact support.
- [API reference](https://docs.celeris.ai/api-reference.md): The Celeris HTTP API — endpoints, request fields, response schema, and headers.