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OpenAI · Balanced

GPT 5 Pro

Added Oct 6, 2025

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Use in the app

The highest performing version of the flagship model GPT 5 by OpenAI.

  • Reasoning
  • Vision
Input
Text, Images
Output
Text
Reasoning effort
high
Discovery tier
Balanced

Pricing

USD per 1M tokens
Input
$15.00
Output
$120.00
Cache read
$1.50

Reference prices as published by the model provider. API example

Specifications

Context window
400K
Max output
128K
Average output (7 days)
90 tokens
Longer than 8% of 468 models

Side by side

GPT 5 Pro compared

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

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GPT 5 ProOpenAIThis modelGPT 6 LunaOpenAIRemove
ProviderOpenAIOpenAI
Discovery tierBalancedEfficient
AddedOct 6, 2025Sep 22, 2026
Limits
Context window400K1.05MBest
Max output128K128K
Average output90 tokens120 tokens
Pricing, USD per 1M tokens
Input$15.00$0.10Best
Output$120.00$0.50Best
Cache read$1.50$0.01Best
Cache write—$0.13
Performance
Throughput—88.2 tok/s
Time to first token—1.8 s
Request success (24h)—99.7%
Benchmark indexes
Intelligence Index—29.9
Capabilities
ReasoningYesYes
ToolsNoYes
VisionYesYes
Structured outputNoYes
PDF inputNoYes
Reasoning efforthighnone, 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 Pro
  • GPT 6 Luna

Intelligence Index

  • GPT 5 Pro—
  • GPT 6 Luna29.9
3.8Catalog models by score55.1

Agentic work

  • AutomationBench-AA

    Workflow automation, penalized for guardrail violations

    • GPT 5 Pro: —
    • GPT 6 Luna: 40.5%

  • AutomationBench-AA tasks completed

    Workflows finished end to end without a guardrail violation

    • GPT 5 Pro: —
    • GPT 6 Luna: 10.2%

  • AA-Briefcasev1.1

    Agentic knowledge work, rated head to head

    • GPT 5 Pro: —
    • GPT 6 Luna: 1,097 Elo

  • GDPval-AAv2.1

    Economically valuable occupational tasks, rated head to head

    • GPT 5 Pro: —
    • GPT 6 Luna: 1,263 Elo

Document reasoning

  • GDP.pdf

    Professional reasoning over PDF documents, all-pass rate

    • GPT 5 Pro: —
    • GPT 6 Luna: 13.8%

  • AA-LCRv1.1

    Reasoning across long documents

    • GPT 5 Pro: —
    • GPT 6 Luna: 78.3%

  • MLCR-AA

    Long-context reasoning over medical records

    • GPT 5 Pro: —
    • GPT 6 Luna: 18.3%

Reasoning and knowledge

  • Humanity’s Last Exam

    Expert-level questions across academic fields

    • GPT 5 Pro: —
    • GPT 6 Luna: 28.3%

Coding

  • Terminal-Benchv4.0

    Practical software engineering in a terminal

    • GPT 5 Pro: —
    • GPT 6 Luna: 2.5%

  • SciCode

    Scientific computing in Python

    • GPT 5 Pro: —
    • GPT 6 Luna: 50.9%

Legacy evaluations

  • AA-LCR (unversioned)

    Long-context reasoning, earlier grading

    • GPT 5 Pro: —
    • GPT 6 Luna: 78.3%

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/gpt-5-pro",
    "reasoning_effort": "high",
    "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-pro",
    messages=[{"role": "user", "content": "Explain this stack trace."}],
)
print(reply.choices[0].message.content)

OpenAI

Other OpenAI models, starting with the same family.