Model by OpenAI

GPT-5.4

GPT-5.4 is an earlier OpenAI frontier model, and it suits teams already on the OpenAI API who need a very long context for coding and document work.

Checked 2026-11-05

GPT-5.4 is an earlier OpenAI frontier model, and it suits teams already on the OpenAI API who need a very long context for coding and document work. OpenAI's model page lists a 1,050,000-token context, up to 128,000 output tokens, text and image input, text output, and a knowledge cutoff of 31 August 2025. Standard price is $2.50 per million input tokens and $15 per million output tokens, with cached input at $0.25. The catch is the long-context surcharge: prompts above 272K input tokens cost twice as much for input and 1.5 times for output across the whole session. OpenRouter lists it from 5 March 2026 with the same prices. OpenAI has since moved on to the GPT-6 line, so this is a pick for existing integrations more than new builds. Figures come from the OpenAI model page and the OpenRouter model list. We have not run it ourselves. We would keep it where it already works, and test a GPT-6 model before starting anything new.

Mentioned here

Questions

What is the context window of GPT-5.4?

1,050,000 tokens, with up to 128,000 tokens of output.

How much does GPT-5.4 cost?

$2.5 per million input tokens and $15 per million output tokens, checked 31 October 2026.

Can I run GPT-5.4 on my own hardware?

No. The weights are not published, so you use it through the maker's API or a hosting provider.

Who makes GPT-5.4?

OpenAI makes it, and released it on 5 March 2026.

Reviews

Loading reviews…

Write a review

Your rating

Up to 1000 characters. Stars alone are enough.

Similar

  • GPT-4.1

    GPT-4.1 is OpenAI's April 2025 non-reasoning model, built for instruction following and long-context code work, and it is now deprecated.

    • Closed

    OpenAI, 1M context, $2 in / 1M

  • o3

    o3 is OpenAI's April 2025 reasoning model, and it is now deprecated, so it suits only code that still calls it.

    • Closed

    OpenAI, 200K context, $2 in / 1M

  • gpt-oss-20b

    gpt-oss-20b is OpenAI's smaller open-weights model, suited to running a reasoning model on your own machine or paying very little through an API.

    • Open weights

    OpenAI, 131K context, $0.03 in / 1M

  • GPT-5.4 Nano

    GPT-5.4 Nano was OpenAI's cheapest GPT-5.4 model, built for speed-critical, high-volume jobs, and it is now deprecated.

    • Closed

    OpenAI, 400K context, $0.20 in / 1M

  • GPT-5.4 Mini

    GPT-5.4 Mini is OpenAI's smaller GPT-5.4 model, aimed at high-throughput coding and reasoning work where the full model costs too much.

    • Closed

    OpenAI, 400K context, $0.75 in / 1M

  • GPT-5.3-Codex

    GPT-5.3-Codex is OpenAI's agentic coding model from early 2026, and it now suits only teams that must keep an existing pipeline running.

    • Closed
    • Coding

    OpenAI, 400K context, $1.75 in / 1M