OpenAI model on Crazyrouter
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Try OpenAI o3 online — then use the API with one key

OpenAI o3 is available on Crazyrouter through the OpenAI-compatible endpoint and the native OpenAI Responses protocol. Switch models without changing your integration, and see every request in one billing view.

Use this model via API

This model is available through the paid API. Create an account, add funds and create an API key. The $2 Playground credit is for supported text models only, not API calls.

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OpenAI compatibleReasoningMathCoding
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OpenAI
o3
See current pricing
Model ID
o3
Provider
OpenAI
Endpoint
/v1/chat/completions
Task
chat
Context window
200K tokens
Input modalities
Text, image
Output modalities
Text

What is OpenAI o3?

OpenAI o3 is a o-series model from OpenAI for chat, reasoning, coding and agent workflows. On Crazyrouter it runs behind the same API key and billing account as 300+ other models, so you can benchmark it against alternatives and route traffic without new credentials.

Drop-in OpenAI compatibility

Works with the OpenAI SDKs, LangChain, Cursor, Cline and any tool that accepts a custom base URL.

Streaming and tool use

Streaming, tools and structured output depend on the model and upstream channel. Check the required feature on your channel before production use.

Live, discounted pricing

Rates on this page come straight from the billing table and already include the Crazyrouter discount.

One account for every model

Compare against Claude, GPT, Gemini, DeepSeek and more without juggling vendor accounts.

OpenAI o3 API quickstart

Point your OpenAI SDK at https://api.crazyrouter.com/v1 and set the model to o3. If your client speaks OpenAI Responses natively, use the second example instead.

cURL
curl https://api.crazyrouter.com/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $CRAZYROUTER_API_KEY" \
  -d '{
    "model": "o3",
    "messages": [{"role": "user", "content": "Explain the tradeoffs of this architecture decision."}],
    "stream": true
  }'
Show OpenAI-compatible migration example
cURL
curl https://api.crazyrouter.com/v1/responses \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $CRAZYROUTER_API_KEY" \
  -d '{
    "model": "o3",
    "input": "Explain the tradeoffs of this architecture decision.",
    "stream": true
  }'

Best use cases

Coding assistants and agent loops with tool calls
Long-document analysis, summarisation and extraction
Customer-facing chat with streaming responses
Evaluation and A/B tests across model vendors
Batch classification, tagging and structured extraction
Technical writing, design docs and code review

Works with developer tools

OpenAI SDKs

Set base_url to https://api.crazyrouter.com/v1 and model to o3.

Cursor, Cline, Continue

Add Crazyrouter as a custom OpenAI-compatible provider and pick the model from the list.

LangChain / LlamaIndex

Use the OpenAI chat model class with the Crazyrouter base URL.

Claude Code / Codex CLI

CLI compatibility requires the native protocol and a supported model/channel. Follow the integration guide and verify compatibility before use.

OpenAI o3 FAQ

What base URL do I use for OpenAI o3?

https://api.crazyrouter.com/v1. Chat completions go to /v1/chat/completions; native OpenAI Responses requests use their usual path.

How is usage billed?

Per token, at the input/output rates shown on this page. Your balance is debited per request; there is no subscription.

Does it support streaming and function calling?

Support varies by model and upstream channel. The request example is a starting point; verify streaming, tools and structured output separately before production use.

Can I switch to another model later?

Change the model string. The same key works for every model in the Crazyrouter catalogue.

Where do I see the current price?

The pricing page lists live rates for every model, including group discounts if you are logged in.

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