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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 modelQwen3.5 27B TEEQwenRemove
ProviderOpenAIQwen
Discovery tierFrontierOpen weights
AddedAug 7, 2025Mar 13, 2026
Limits
Context window400KBest262.14K
Max output128KBest65.54K
Average output411 tokens1.4K tokens
Pricing, USD per 1M tokens
Input$1.25$0.30Best
Output$10.00$2.40Best
Cache read$0.13—
Benchmark indexes
Intelligence Index23.0Best22.9
Coding Index37.8—
Math Index94.3—
Capabilities
ReasoningYesNo
ToolsYesNo
VisionYesYes
Structured outputYesNo
PDF inputYesNo
Video inputNoYes
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
  • Qwen3.5 27B TEE

Intelligence Index

  • GPT 523.0
  • Qwen3.5 27B TEE22.9

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
    • Qwen3.5 27B TEE: —

  • Math Index

    Composite of the math evaluations

    • GPT 5: 94.3
    • Qwen3.5 27B TEE: —

Agentic work

  • GDPval-AAv2.1

    Economically valuable occupational tasks, rated head to head

    • GPT 5: 918 Elo
    • Qwen3.5 27B TEE: —

Document reasoning

  • AA-LCRv1.1

    Reasoning across long documents

    • GPT 5: 78.2%Top
    • Qwen3.5 27B TEE: 77.7%

Reasoning and knowledge

  • Humanity’s Last Exam

    Expert-level questions across academic fields

    • GPT 5: 28.5%Top
    • Qwen3.5 27B TEE: 23.9%

  • GPQA Diamond

    Graduate-level science questions

    • GPT 5: 85.4%
    • Qwen3.5 27B TEE: 85.8%Top

  • MMLU-Pro

    Multi-subject knowledge and reasoning

    • GPT 5: 87.1%
    • Qwen3.5 27B TEE: —

  • IFBench

    Following precise output instructions

    • GPT 5: 73.1%
    • Qwen3.5 27B TEE: 75.6%Top

Coding

  • LiveCodeBench

    Recent competitive programming problems

    • GPT 5: 84.6%
    • Qwen3.5 27B TEE: —

Math

  • AIME 2025

    Competition mathematics, 2025 problems

    • GPT 5: 94.3%
    • Qwen3.5 27B TEE: —

  • AIME

    Competition mathematics

    • GPT 5: 95.7%
    • Qwen3.5 27B TEE: —

  • MATH-500

    Competition math problems

    • GPT 5: 99.4%
    • Qwen3.5 27B TEE: —

Legacy evaluations

  • Terminal-Bench Hard

    Earlier terminal task suite

    • GPT 5: 32.6%Top
    • Qwen3.5 27B TEE: 32.6%Top

  • τ²-Bench Telecom

    Tool use in a customer-support simulation

    • GPT 5: 84.8%
    • Qwen3.5 27B TEE: 93.9%Top

  • AA-LCR (unversioned)

    Long-context reasoning, earlier grading

    • GPT 5: 78.2%Top
    • Qwen3.5 27B TEE: 77.7%

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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