OpenAIMediumUltra

o3

OpenAI's frontier reasoning model. Uses extended chain-of-thought to solve complex problems in science, coding, and math with high accuracy at a competitive price.

3,716/14,864credits

input / output · per 1M tokens

Frontier chain-of-thought reasoning

200K context window

100K max output tokens

Vision capabilities

Function calling support

Discounted cached input tokens

Run it right now

Test this model instantly in the Console Playground — no code required

Use with AI Assistant

Copy usage instructions for Claude, ChatGPT, or other AI

llms.txtllms.txt ↗

Model Specifications

Context Window

200K

tokens

Max Output

100K

tokens

Training Cutoff

2024-06

Compatible SDK

OpenAI

Capabilities

Vision

Function Calling

Streaming

JSON Mode

System Prompt

Token Pricing (per 1M tokens)

Token Type	Credits	USD Equivalent
Input Tokens	3,716	$2.48
Output Tokens	14,864	$9.91
Cached Tokens	929	$0.62

* 1,500 credits ≈ $1 (actual charges may vary based on usage)

Quick Start

curl -X POST "https://api.core.today/llm/openai/v1/chat/completions" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer cdt_your_api_key" \
  -d '{
  "model": "o3",
  "messages": [
    {
      "role": "user",
      "content": "Find all integer solutions to x^2 + y^2 = z^2 where x, y, z are consecutive terms of an arithmetic progression. Show your reasoning."
    }
  ],
  "reasoning_effort": "high"
}'

Parameters

Parameter	Type	Required	Default	Description
`messages`	array	Yes	-	Array of message objects
`model`	string	Yes	o3	Model identifier
`max_completion_tokens`	integer	No	-	Maximum tokens for completion (includes reasoning tokens)
`reasoning_effort`	string	No	medium	Reasoning effort level: low, medium, high lowmediumhigh

Examples

Complex Math

Solve advanced math problems with o3

curl -X POST "https://api.core.today/llm/openai/v1/chat/completions" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer cdt_your_api_key" \
  -d '{
  "model": "o3",
  "messages": [
    {
      "role": "user",
      "content": "Find all integer solutions to x^2 + y^2 = z^2 where x, y, z are consecutive terms of an arithmetic progression. Show your reasoning."
    }
  ],
  "reasoning_effort": "high"
}'

Code Debugging

Deep debugging with step-by-step reasoning

curl -X POST "https://api.core.today/llm/openai/v1/chat/completions" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer cdt_your_api_key" \
  -d '{
  "model": "o3",
  "messages": [
    {
      "role": "user",
      "content": "This async Python function deadlocks intermittently under load. Walk through the possible interleavings and find the bug: [code snippet]"
    }
  ],
  "max_completion_tokens": 8000
}'