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Every model you and your agent need — one OpenAI-compatible key.

FlexAI Token Factory is an OpenAI-compatible inference API for open text, code, reasoning, vision, and embedding models. Point any OpenAI SDK at tokens.flex.ai and your existing code works unchanged.

Add a billing address and card to create your API key, then pay per token — no packs, no subscriptions. See billing.

Get an API keyRead the quickstart

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Drop-in OpenAI compatibility

Already have code that calls OpenAI? Change the base URL and key — nothing else. 
curl https://tokens.flex.ai/v1/chat/completions \
  -H "Authorization: Bearer $FLEXAI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "Meta-Llama-3.1-8B-Instruct-FP8",
    "messages": [{"role": "user", "content": "Say hello in one line."}]
  }'
Browse the live catalog at flex.ai/models, then follow the full Quickstart to get a key and make your first request.

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Why Token Factory

OpenAI-compatible

A drop-in for the OpenAI SDK. Swap the base URL and model id — keep your code, prompts, and tools.

Agent-ready

Tool calls, streaming, structured output, and vision — all native. See the streaming and vision guides.

Every model, discoverable

Text, code, reasoning, vision, and embedding models behind one key. Filter the live catalog from code with model discovery.

Transparent per-token pricing

Dollar-denominated, per-token billing — no token packs, no subscriptions. Account-level budgets and rate limits.

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Start building

Overview

What the API is, what you get, and where everything lives.

Quickstart

Get a key and make your first request in under two minutes.

Guides

Streaming, tool use, vision, embeddings, model discovery, batching, and concurrency.

API reference

Endpoints, the compatibility matrix, errors, and billing.

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Scale beyond serverless

The serverless API is the fastest way to start. When you need more, the FlexAI platform also offers dedicated inference endpoints, fine-tuning, training, and private deployments.

Explore the platform

Dedicated endpoints, fine-tuning, training, and platform services.

flex.ai

Pricing, the full product story, and scaling to private AI cloud.

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Ready to build?

Get an API key and make your first request in minutes.

Get an API keyTalk to us
Need help? Email support@flex.ai, join our Slack community, or check status.flex.ai.