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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

Side by side

GPT 5 compared

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

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GPT 5OpenAIThis modelNvidia Nemotron 3 Ultra 550BnvidiaRemove
ProviderOpenAInvidia
Discovery tierFrontierOpen weights
AddedAug 7, 2025Jun 4, 2026
Limits
Context window400K1MBest
Max output128KBest65.54K
Average output411 tokens56 tokens
Pricing, USD per 1M tokens
Input$1.25$0.50Best
Output$10.00$2.50Best
Cache read$0.13—
Performance
Throughput—111.9 tok/s
Time to first token—1.5 s
Request success (24h)—100.0%
Benchmark indexes
Intelligence Index23.0Best22.9
Coding Index37.849.3Best
Math Index94.3—
Capabilities
ReasoningYesYes
ToolsYesYes
VisionYesNo
Structured outputYesNo
PDF inputYesNo
Parallel toolsNoYes
Reasoning effortminimal, low, medium, high—

Public evaluations

Benchmarks

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

  • GPT 5
  • Nvidia Nemotron 3 Ultra 550B

Intelligence Index

  • GPT 523.0
  • Nvidia Nemotron 3 Ultra 550B22.9

GPT 5 tested at high reasoning effort

GPT 5: Better than 57% of 326 scored models

3.8Catalog models by score55.1

Indexes

  • Coding Index

    Composite of the coding evaluations

    • GPT 5: 37.8
    • Nvidia Nemotron 3 Ultra 550B: 49.3Top

  • Math Index

    Composite of the math evaluations

    • GPT 5: 94.3
    • Nvidia Nemotron 3 Ultra 550B: —

Agentic work

  • AutomationBench-AA

    Workflow automation, penalized for guardrail violations

    • GPT 5: —
    • Nvidia Nemotron 3 Ultra 550B: 3.0%

  • AutomationBench-AA tasks completed

    Workflows finished end to end without a guardrail violation

    • GPT 5: —
    • Nvidia Nemotron 3 Ultra 550B: 0.3%

  • AA-Briefcasev1.1

    Agentic knowledge work, rated head to head

    • GPT 5: —
    • Nvidia Nemotron 3 Ultra 550B: 876 Elo

  • GDPval-AAv2.1

    Economically valuable occupational tasks, rated head to head

    • GPT 5: 918 Elo
    • Nvidia Nemotron 3 Ultra 550B: 1,013 EloTop

Document reasoning

  • GDP.pdf

    Professional reasoning over PDF documents, all-pass rate

    • GPT 5: —
    • Nvidia Nemotron 3 Ultra 550B: 5.0%

  • AA-LCRv1.1

    Reasoning across long documents

    • GPT 5: 78.2%
    • Nvidia Nemotron 3 Ultra 550B: 79.3%Top

  • MLCR-AA

    Long-context reasoning over medical records

    • GPT 5: —
    • Nvidia Nemotron 3 Ultra 550B: 5.6%

Reasoning and knowledge

  • Humanity’s Last Exam

    Expert-level questions across academic fields

    • GPT 5: 28.5%Top
    • Nvidia Nemotron 3 Ultra 550B: 28.4%

  • GPQA Diamond

    Graduate-level science questions

    • GPT 5: 85.4%
    • Nvidia Nemotron 3 Ultra 550B: 86.7%Top

  • MMLU-Pro

    Multi-subject knowledge and reasoning

    • GPT 5: 87.1%
    • Nvidia Nemotron 3 Ultra 550B: —

  • IFBench

    Following precise output instructions

    • GPT 5: 73.1%
    • Nvidia Nemotron 3 Ultra 550B: 81.4%Top

Coding

  • Terminal-Benchv4.0

    Practical software engineering in a terminal

    • GPT 5: —
    • Nvidia Nemotron 3 Ultra 550B: 0.5%

  • SciCode

    Scientific computing in Python

    • GPT 5: —
    • Nvidia Nemotron 3 Ultra 550B: 40.3%

  • LiveCodeBench

    Recent competitive programming problems

    • GPT 5: 84.6%
    • Nvidia Nemotron 3 Ultra 550B: —

Math

  • AIME 2025

    Competition mathematics, 2025 problems

    • GPT 5: 94.3%
    • Nvidia Nemotron 3 Ultra 550B: —

  • AIME

    Competition mathematics

    • GPT 5: 95.7%
    • Nvidia Nemotron 3 Ultra 550B: —

  • MATH-500

    Competition math problems

    • GPT 5: 99.4%
    • Nvidia Nemotron 3 Ultra 550B: —

Legacy evaluations

  • Terminal-Bench Hard

    Earlier terminal task suite

    • GPT 5: 32.6%
    • Nvidia Nemotron 3 Ultra 550B: 36.4%Top

  • τ²-Bench Telecom

    Tool use in a customer-support simulation

    • GPT 5: 84.8%Top
    • Nvidia Nemotron 3 Ultra 550B: 83.3%

  • AA-LCR (unversioned)

    Long-context reasoning, earlier grading

    • GPT 5: 78.2%
    • Nvidia Nemotron 3 Ultra 550B: 79.3%Top

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

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