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OpenAI · Frontier

OpenAI o3-pro (2025-06-10)

Added Jan 1, 2024

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Use in the app

The pro version of the already fantastic o3.

  • Reasoning
  • Tools
  • Structured output
Input
Text
Output
Text
Reasoning effort
low · medium · high
Discovery tier
Frontier

Pricing

USD per 1M tokens
Input
$22.00
Output
$88.00
Cache read
$11.00

Reference prices as published by the model provider. API example

Specifications

Context window
200K
Max output
100K

Side by side

OpenAI o3-pro (2025-06-10) compared

Specifications, prices, speed and benchmark scores next to each other. Benchmarks below show every compared model too.

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OpenAI o3-pro (2025-06-10)OpenAIThis modelGemini 3.5 Flash LiteGoogleRemove
ProviderOpenAIGoogle
Discovery tierFrontierEfficient
AddedJan 1, 2024Jul 21, 2026
Limits
Context window200K1.05MBest
Max output100KBest65.54K
Average output—178 tokens
Pricing, USD per 1M tokens
Input$22.00$0.30Best
Output$88.00$2.50Best
Cache read$11.00$0.03Best
Cache write—$0.0833
Performance
Throughput—220.7 tok/s
Time to first token—2.2 s
Request success (24h)—99.8%
Benchmark indexes
Intelligence Index21.922.2Best
Coding Index—49.3
Capabilities
ReasoningYesYes
ToolsYesYes
VisionNoYes
Structured outputYesYes
PDF inputNoYes
Audio inputNoYes
Video inputNoYes
Reasoning effortlow, medium, highminimal, low, medium, high

Public evaluations

Benchmarks

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

  • OpenAI o3-pro (2025-06-10)
  • Gemini 3.5 Flash Lite

Intelligence Index

  • OpenAI o3-pro (2025-06-10)21.9
  • Gemini 3.5 Flash Lite22.2

OpenAI o3-pro (2025-06-10): Better than 53% of 326 scored models

3.8Catalog models by score55.1

Indexes

  • Coding Index

    Composite of the coding evaluations

    • OpenAI o3-pro (2025-06-10): —
    • Gemini 3.5 Flash Lite: 49.3

Agentic work

  • AutomationBench-AA

    Workflow automation, penalized for guardrail violations

    • OpenAI o3-pro (2025-06-10): —
    • Gemini 3.5 Flash Lite: 25.0%

  • AutomationBench-AA tasks completed

    Workflows finished end to end without a guardrail violation

    • OpenAI o3-pro (2025-06-10): —
    • Gemini 3.5 Flash Lite: 3.3%

  • Harvey LAB-AAv1.1

    Legal tasks passed in full, with no material hallucination

    • OpenAI o3-pro (2025-06-10): —
    • Gemini 3.5 Flash Lite: 0.0%

  • AA-Briefcasev1.1

    Agentic knowledge work, rated head to head

    • OpenAI o3-pro (2025-06-10): —
    • Gemini 3.5 Flash Lite: 650 Elo

  • GDPval-AAv2.1

    Economically valuable occupational tasks, rated head to head

    • OpenAI o3-pro (2025-06-10): —
    • Gemini 3.5 Flash Lite: 985 Elo

Document reasoning

  • GDP.pdf

    Professional reasoning over PDF documents, all-pass rate

    • OpenAI o3-pro (2025-06-10): —
    • Gemini 3.5 Flash Lite: 13.6%

  • AA-LCRv1.1

    Reasoning across long documents

    • OpenAI o3-pro (2025-06-10): —
    • Gemini 3.5 Flash Lite: 76.0%

  • MLCR-AA

    Long-context reasoning over medical records

    • OpenAI o3-pro (2025-06-10): —
    • Gemini 3.5 Flash Lite: 10.6%

Reasoning and knowledge

  • Humanity’s Last Exam

    Expert-level questions across academic fields

    • OpenAI o3-pro (2025-06-10): —
    • Gemini 3.5 Flash Lite: 18.8%

  • GPQA Diamond

    Graduate-level science questions

    • OpenAI o3-pro (2025-06-10): 84.5%Top
    • Gemini 3.5 Flash Lite: 83.8%

Coding

  • Terminal-Benchv4.0

    Practical software engineering in a terminal

    • OpenAI o3-pro (2025-06-10): —
    • Gemini 3.5 Flash Lite: 1.0%

  • SciCode

    Scientific computing in Python

    • OpenAI o3-pro (2025-06-10): —
    • Gemini 3.5 Flash Lite: 41.3%

Legacy evaluations

  • AA-LCR (unversioned)

    Long-context reasoning, earlier grading

    • OpenAI o3-pro (2025-06-10): —
    • Gemini 3.5 Flash Lite: 76.0%

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-pro-2025-06-10",
    "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-pro-2025-06-10",
    messages=[{"role": "user", "content": "Explain this stack trace."}],
)
print(reply.choices[0].message.content)

OpenAI

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