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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 modelGPT Chat LatestOpenAIRemove
ProviderOpenAIOpenAI
Discovery tierFrontierFrontier
AddedAug 7, 2025May 3, 2026
Limits
Context window400K1.05MBest
Max output128K128K
Average output411 tokens408 tokens
Pricing, USD per 1M tokens
Input$1.25Best$2.00
Output$10.00$10.00
Cache read$0.13Best$0.20
Cache write—$2.50
Performance
Throughput—83.7 tok/s
Time to first token—2.6 s
Request success (24h)—100.0%
Benchmark indexes
Intelligence Index23.047.0Best
Coding Index37.877.4Best
Math Index94.3—
Capabilities
ReasoningYesYes
ToolsYesYes
VisionYesYes
Structured outputYesYes
PDF inputYesYes
Reasoning effortminimal, low, medium, highnone, low, medium, high, xhigh, max

Public evaluations

Benchmarks

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

  • GPT 5
  • GPT Chat Latest

Intelligence Index

  • GPT 523.0
  • GPT Chat Latest47.0

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
    • GPT Chat Latest: 77.4Top

  • Math Index

    Composite of the math evaluations

    • GPT 5: 94.3
    • GPT Chat Latest: —

Agentic work

  • AutomationBench-AA

    Workflow automation, penalized for guardrail violations

    • GPT 5: —
    • GPT Chat Latest: 60.1%

  • AutomationBench-AA tasks completed

    Workflows finished end to end without a guardrail violation

    • GPT 5: —
    • GPT Chat Latest: 30.3%

  • AA-Briefcasev1.1

    Agentic knowledge work, rated head to head

    • GPT 5: —
    • GPT Chat Latest: 1,479 Elo

  • GDPval-AAv2.1

    Economically valuable occupational tasks, rated head to head

    • GPT 5: 918 Elo
    • GPT Chat Latest: 1,609 EloTop

Document reasoning

  • GDP.pdf

    Professional reasoning over PDF documents, all-pass rate

    • GPT 5: —
    • GPT Chat Latest: 27.2%

  • AA-LCRv1.1

    Reasoning across long documents

    • GPT 5: 78.2%
    • GPT Chat Latest: 84.0%Top

  • MLCR-AA

    Long-context reasoning over medical records

    • GPT 5: —
    • GPT Chat Latest: 30.0%

Reasoning and knowledge

  • Humanity’s Last Exam

    Expert-level questions across academic fields

    • GPT 5: 28.5%
    • GPT Chat Latest: 49.5%Top

  • GPQA Diamond

    Graduate-level science questions

    • GPT 5: 85.4%
    • GPT Chat Latest: 94.1%Top

  • MMLU-Pro

    Multi-subject knowledge and reasoning

    • GPT 5: 87.1%
    • GPT Chat Latest: —

  • IFBench

    Following precise output instructions

    • GPT 5: 73.1%Top
    • GPT Chat Latest: 72.7%

Coding

  • Terminal-Benchv4.0

    Practical software engineering in a terminal

    • GPT 5: —
    • GPT Chat Latest: 39.9%

  • SciCode

    Scientific computing in Python

    • GPT 5: —
    • GPT Chat Latest: 57.1%

  • LiveCodeBench

    Recent competitive programming problems

    • GPT 5: 84.6%
    • GPT Chat Latest: —

Math

  • AIME 2025

    Competition mathematics, 2025 problems

    • GPT 5: 94.3%
    • GPT Chat Latest: —

  • AIME

    Competition mathematics

    • GPT 5: 95.7%
    • GPT Chat Latest: —

  • MATH-500

    Competition math problems

    • GPT 5: 99.4%
    • GPT Chat Latest: —

Legacy evaluations

  • Terminal-Bench Hard

    Earlier terminal task suite

    • GPT 5: 32.6%
    • GPT Chat Latest: 65.9%Top

  • τ²-Bench Telecom

    Tool use in a customer-support simulation

    • GPT 5: 84.8%
    • GPT Chat Latest: 85.1%Top

  • AA-LCR (unversioned)

    Long-context reasoning, earlier grading

    • GPT 5: 78.2%
    • GPT Chat Latest: 84.0%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

Other OpenAI models, starting with the same family.