GPT-5.4 Pro is OpenAI's smartest model that uses extended compute to reason deeper and produce more accurate, precise answers on hard problems.

How is GPT-5.4 Pro different from GPT-5.4?

GPT-5.4 Pro uses significantly more reasoning compute, resulting in higher accuracy on complex tasks. It's slower but smarter.

What's the context window?

1,050,000 tokens — one of the largest available, with up to 128K output tokens.

When should I use GPT-5.4 Pro vs regular GPT-5.4?

Use Pro for hard reasoning, math, research, and tasks where accuracy matters more than speed. Use regular 5.4 for everyday tasks.

Is GPT-5.4 Pro included in NinjaChat plans?

Every NinjaChat plan includes GPT-5.4 Pro: create an account, choose a plan and pick GPT-5.4 Pro in the model list. No separate OpenAI subscription is needed.

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Chat with GPT 5.4 Pro

GPT-5.4 Pro is OpenAI's most powerful and intelligent model, designed to tackle the hardest problems with extended reasoning capabilities. It uses significantly more compute to think deeper and produce smarter, more precise responses.

Try GPT 5.4 Pro See plans

Trusted by 790,000+ users

1.05M tokens

Context

August 31, 2025

Knowledge cutoff

128,000 tokens

Max output

Deliberate

Speed

Build with GPT 5.4 Pro via APIgpt-5.4-pro · $30 / $180 per 1M tokensAPI pricing & docs →

What you’ll use it for

Complex Research

Deep analysis and research tasks requiring extended reasoning.

Mathematical Proofs

Solve advanced math and logic problems with step-by-step reasoning.

Code Architecture

Design and review complex software systems with precision.

Strategic Analysis

Multi-factor analysis for business, scientific, and policy decisions.

Prompts to steal

Tuned to this model — click any line to copy.

About GPT 5.4 Pro

GPT-5.4 Pro supports reasoning effort levels (medium, high, xhigh) and features a massive 1,050,000 token context window with up to 128,000 output tokens. It excels at complex analysis, research, mathematical proofs, and multi-step reasoning tasks.

On NinjaChat, access GPT-5.4 Pro alongside Claude Opus, Gemini 3 Pro, and 25+ other AI models. Compare the world's most capable reasoning models side by side.