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OpenAI · Balanced

OpenAI o3

Added Apr 16, 2025

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Use in the app

OpenAI o3 is a reasoning model for complex analytical, coding, mathematical, and scientific tasks.

  • Reasoning
Input
Text
Output
Text
Reasoning effort
low · medium · high
Discovery tier
Balanced

Pricing

USD per 1M tokens
Input
$2.00
Output
$8.00
Cache read
$1.00

Reference prices as published by the model provider. API example

Specifications

Context window
200K
Max output
100K
Average output (7 days)
205 tokens
Longer than 22% of 465 models

Side by side

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TryQwen3.8 27B TEELing 3.0 FlashMiniMax M2.1All 3

Public evaluations

Benchmarks

Independent evaluation results, with how each score ranks among the models in the Noumen catalog.

Intelligence Index

20.2

Better than 50% of 326 scored models

3.8Catalog models by score55.1

Indexes

  • Math Index

    88.3

    Composite of the math evaluations

    Better than 85% of 118 scored models

Document reasoning

  • AA-LCRv1.1

    74.7%

    Reasoning across long documents

    Better than 59% of 309 scored models

Reasoning and knowledge

  • Humanity’s Last Exam

    20.1%

    Expert-level questions across academic fields

    Better than 48% of 323 scored models

  • GPQA Diamond

    82.7%

    Graduate-level science questions

    Better than 53% of 291 scored models

  • MMLU-Pro

    85.3%

    Multi-subject knowledge and reasoning

    Better than 88% of 132 scored models

  • IFBench

    71.4%

    Following precise output instructions

    Better than 75% of 215 scored models

Coding

  • LiveCodeBench

    80.8%

    Recent competitive programming problems

    Better than 88% of 129 scored models

Math

  • AIME 2025

    88.3%

    Competition mathematics, 2025 problems

    Better than 85% of 118 scored models

  • AIME

    90.3%

    Competition mathematics

    Better than 95% of 72 scored models

  • MATH-500

    99.2%

    Competition math problems

    Better than 98% of 73 scored models

Legacy evaluations

  • Terminal-Bench Hard

    37.1%

    Earlier terminal task suite

    Better than 73% of 212 scored models

  • τ²-Bench Telecom

    80.7%

    Tool use in a customer-support simulation

    Better than 62% of 214 scored models

  • AA-LCR (unversioned)

    74.7%

    Long-context reasoning, earlier grading

    Better than 59% of 309 scored models

Scores from Artificial Analysis, updated Oct 26, 2026. Artificial Analysis

Developers

Use it through the API

Noumen’s API is OpenAI-compatible: any Chat Completions client works with a base URL and a key.

Read the quickstart
curl https://www.noumen.xyz/api/v1/chat/completions \
  -H "Authorization: Bearer $NOUMEN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/o3",
    "reasoning_effort": "medium",
    "messages": [{ "role": "user", "content": "Explain this stack trace." }]
  }'
import os
from openai import OpenAI

client = OpenAI(base_url="https://www.noumen.xyz/api/v1", api_key=os.environ["NOUMEN_API_KEY"])
reply = client.chat.completions.create(
    model="openai/o3",
    messages=[{"role": "user", "content": "Explain this stack trace."}],
)
print(reply.choices[0].message.content)

OpenAI

Other OpenAI models, starting with the same family.