Build with Apertis
Guides, API reference and articles for building with every leading model through one API key.
- OpenAI
- Anthropic
- SpaceXAI
- DeepSeek
- Meta
- Qwen
- Mistral
- and 27 more
New models
The latest additions to the catalog, available with the same key.
- GPT-6.1 SolGPT-6.1 Sol is an upgraded high-end model in OpenAI's GPT-6 series, positioned below the flagship GPT-6 Astra. It is optimized for agentic coding, computer…
- Claude Sonnet 5.5Claude Sonnet 5.5 is Anthropic's Sonnet-class model for well-scoped everyday work, serving as a direct upgrade to Sonnet 5. It excels at feature development…
- Perceptron Mk1.5Perceptron Mk1.5 chat model that accepts audio input. Audio and text input are billed per token.
- Gemini 3.5 TranscribeGoogle Gemini 3.5 Transcribe speech-to-text. Billed per input and output token.
- Transcribe 1 ProFish Audio Transcribe 1 Pro speech-to-text with speaker labels; transcripts include speaker tags such as <|speaker:0|>. Billed per second of audio.
- Universal-3.5 ProAssemblyAI Universal-3.5 Pro speech-to-text. Billed per second of audio.
Start building
- Introduction
What Apertis is, and how one key reaches every provider.
- Models
Compare models across providers and pick one for each task.
- API reference
Chat completions, Messages, streaming and every other endpoint.
- Coding agents
Connect Claude Code, Cursor, Cline and other coding tools.
- SDKs
Point the OpenAI SDK you already use at Apertis.
- Plans and billing
Subscription plans with fixed quota, or pay as you go per token.