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OpenAI · Frontier

GPT 5.4

Added Mar 5, 2026

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Use in the app

GPT-5.4 is an OpenAI model for professional work with stronger reasoning, coding, and tool use.

  • Reasoning
  • Tools
  • Vision
  • Structured output
  • PDF input
Input
Text, Images
Output
Text
Reasoning effort
none · low · medium · high · xhigh
Discovery tier
Frontier

Pricing

USD per 1M tokens
Input
$2.50
Output
$15.00
Cache read
$0.25

Reference prices as published by the model provider. API example

Specifications

Context window
1.1M
Max output
128K
Average output (7 days)
409 tokens
Longer than 41% of 473 models

Side by side

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TryGemini 3 Flash (Preview)GLM 4.6 Turbo (Thinking)DeepSeek V4 Flash 0423All 3

Public evaluations

Benchmarks

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

Intelligence Index

18.2

Better than 47% of 326 scored models

3.8Catalog models by score55.1

Document reasoning

  • AA-LCRv1.1

    58.3%

    Reasoning across long documents

    Better than 36% of 309 scored models

Reasoning and knowledge

  • Humanity’s Last Exam

    11.3%

    Expert-level questions across academic fields

    Better than 37% of 323 scored models

  • GPQA Diamond

    74.8%

    Graduate-level science questions

    Better than 35% of 291 scored models

  • IFBench

    48.4%

    Following precise output instructions

    Better than 45% of 215 scored models

Legacy evaluations

  • Terminal-Bench Hard

    37.9%

    Earlier terminal task suite

    Better than 74% of 212 scored models

  • τ²-Bench Telecom

    36.0%

    Tool use in a customer-support simulation

    Better than 29% of 214 scored models

  • AA-LCR (unversioned)

    58.3%

    Long-context reasoning, earlier grading

    Better than 36% of 309 scored models

Scores from Artificial Analysis, updated Oct 26, 2026. Artificial Analysis

Live routing data

Performance and reliability

Recent averages across requests routed for this model. Your own speed depends on prompt length, reasoning effort and load.

Prompt cache hits
84.2%
About $0.60 per 1M input tokens with caching
Request success (24h)
100.0%
Reliable

Cache hits are the share of input tokens recently served from a prompt cache across all requests. They are not a forecast of your own hit rate.

Hourly request success · last 72 hoursLowest hour 100.0%
  • Healthy (98% or more)
  • Degraded (90–98%)
  • Down (under 90%)
  • No requests

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-5.4",
    "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-5.4",
    messages=[{"role": "user", "content": "Explain this stack trace."}],
)
print(reply.choices[0].message.content)

OpenAI

Other OpenAI models, starting with the same family.