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OpenAI
o3:free
o3 is a well-rounded and powerful model across domains. It sets a new standard for math, science, coding, and visual reasoning tasks. It also excels at technical writing and instruction-following....
TextReasoningToolsFilesVision200KCache
InputFree
OutputFree
Context200K
Endpointsopenai
Capabilities
ReasoningToolsVisionFilesCacheStructured
Modalities
Input
imagetextfile
Output
text
Quick stats
Context window200K
Max output100K
Modechat
TokenizerGPT
Knowledge cutoff2024
ModeratedYes
Performance
Loading performance data...
Supported parameters
| Parameter | Always | Default |
|---|---|---|
| include_reasoning | - | |
| max_tokens | - | |
| reasoning | - | |
| response_format | - | |
| seed | - | |
| structured_outputs | - | |
| tool_choice | - | |
| tools | - |
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Pricing
| Input price | $0.00 · 1M tokens |
| Output price | $0.00 · 1M tokens |
| Context window | 200K tokens |
| Compatible endpoints | openai |
| Vendor | OpenAI |
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Call o3:free from your code
Point any OpenAI-compatible SDK at UnoRouter and request the model by name. Replace YOUR_API_KEY with a real key from your dashboard.
bash
curl https://api.unorouter.com/v1/chat/completions \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "o3:free",
"messages": [{"role": "user", "content": "Hello!"}]
}'§ 03
Frequently asked questions
How much does o3:free cost per 1M tokens?
Input is priced at $0.00 per 1M tokens, output at $0.00 per 1M tokens. Billing is per token, no rounding to batch sizes.
How do I access o3:free via API?
Send requests to the UnoRouter /v1/chat/completions endpoint with model=o3:free. Any OpenAI-compatible client library works. Authentication uses a standard Bearer token.
What is the context window of o3:free?
o3:free supports a context window of 200K tokens, shared between your prompt and the model's response.
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