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OpenAI · Frontier

GPT 5

Added Aug 7, 2025

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Use in the app

GPT-5 is OpenAI's most advanced model, offering major improvements in reasoning, code quality, and user experience. It handles complex coding tasks with minimal prompting, provides clear explanations, and introduces enhanced agentic capabilities. Designed for logic and multi-step tasks.

  • Reasoning
  • Tools
  • Vision
  • Structured output
  • PDF input
Input
Text, Images
Output
Text
Reasoning effort
minimal · low · medium · high
Discovery tier
Frontier

Pricing

USD per 1M tokens
Input
$1.25
Output
$10.00
Cache read
$0.13

Reference prices as published by the model provider. API example

Specifications

Context window
400K
Max output
128K
Average output (7 days)
411 tokens
Longer than 41% of 468 models

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TryNvidia Nemotron 3 Ultra 550BQwen3.5 27B TEEMiniMax M2.7All 3

Public evaluations

Benchmarks

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

Intelligence Index

23.0

Tested at high reasoning effort

Better than 57% of 326 scored models

3.8Catalog models by score55.1

Indexes

  • Coding Index

    37.8

    Composite of the coding evaluations

    Better than 31% of 168 scored models

  • Math Index

    94.3

    Composite of the math evaluations

    Better than 94% of 118 scored models

Agentic work

  • GDPval-AAv2.1

    918 Elo

    Economically valuable occupational tasks, rated head to head

    Better than 30% of 187 scored models

Document reasoning

  • AA-LCRv1.1

    78.2%

    Reasoning across long documents

    Better than 68% of 309 scored models

Reasoning and knowledge

  • Humanity’s Last Exam

    28.5%

    Expert-level questions across academic fields

    Better than 60% of 323 scored models

  • GPQA Diamond

    85.4%

    Graduate-level science questions

    Better than 60% of 291 scored models

  • MMLU-Pro

    87.1%

    Multi-subject knowledge and reasoning

    Better than 97% of 132 scored models

  • IFBench

    73.1%

    Following precise output instructions

    Better than 81% of 215 scored models

Coding

  • LiveCodeBench

    84.6%

    Recent competitive programming problems

    Better than 91% of 129 scored models

Math

  • AIME 2025

    94.3%

    Competition mathematics, 2025 problems

    Better than 94% of 118 scored models

  • AIME

    95.7%

    Competition mathematics

    Highest of 72 scored models

  • MATH-500

    99.4%

    Competition math problems

    Highest of 73 scored models

Legacy evaluations

  • Terminal-Bench Hard

    32.6%

    Earlier terminal task suite

    Better than 60% of 212 scored models

  • τ²-Bench Telecom

    84.8%

    Tool use in a customer-support simulation

    Better than 65% of 214 scored models

  • AA-LCR (unversioned)

    78.2%

    Long-context reasoning, earlier grading

    Better than 68% of 309 scored models

Scores from Artificial Analysis, updated Oct 26, 2026. GPT 5 was tested at high reasoning effort; compare scores measured at the same effort.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/gpt-5",
    "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/gpt-5",
    messages=[{"role": "user", "content": "Explain this stack trace."}],
)
print(reply.choices[0].message.content)

OpenAI

Other OpenAI models, starting with the same family.