> GPT-5.4 Thinking is a closed AI model from OpenAI, released 5 Mar 2026.

[Models](https://themodelindex.org/models/) /[OpenAI](https://themodelindex.org/labs/openai/)

# GPT-5.4 Thinking

OpenAI

Released 5 Mar 2026

Closed

Flagship

Date verified

[Compare](https://themodelindex.org/compare/gpt-5-4-thinking-vs-kimi-k2-5/) [Announcement](https://openai.com/index/gpt-5-4-thinking-system-card/)

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Index score

Not yet evaluated independently

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Core tests taken

no independent results yet

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Versus the frontier at release

Replaced by [GPT-5.5 Thinking](https://themodelindex.org/models/gpt-5-5-thinking/)

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Price per million tokens

no public API price found

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Context window

tokens it reads at once

## Where it sits · on the frontier

_Chart: Model Index score of every scored model since late 2022, with the best closed and best open model over time_

Not plotted: no index score yet.

## Test results · by area · tick = best by any model

Reasoning & knowledge

no evidence yet

GPQA Diamond

no result

Humanity's Last Exam

no result

Maths

no evidence yet

FrontierMath T1-3

no result

Coding

no evidence yet

SWE-bench Verified

no result

Terminal-Bench

no result

Agents

no evidence yet

APEX-Agents

no result

Novel problems

no evidence yet

ARC-AGI-2

no result

Long tasks

no evidence yet

METR time horizon

no result

Independent results from the Epoch AI benchmarking hub, best reasoning setting. The core tests are shown here; anchor tests also inform the score and can be shown above.

## What others say · rank on each leaderboard

Not on any of the rankings we follow yet.

Further left is better. Leaderboards measure different things: LMArena is people voting blind between two answers, the others are test scores. Click any row for the source.

## Best at · top three among current models

Replaced by GPT-5.5 Thinking; it no longer leads any category among current models.

Where this model places in the top three of today's models, on category leaderboards and on our core tests.

## Where to use it · prices checked 1 Oct 2026

#### From the lab

ChatGPT

app · subscription

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OpenAI API

API

↗

Provider prices come from OpenRouter's live listing; going direct to a provider can differ. Subscriptions are the lab's own apps.

## Facts and sources

Released

5 Mar 2026

Announcement

[openai.com ↗](https://openai.com/index/gpt-5-4-thinking-system-card/)

Release entry

GPT-5.4 (Thinking/Pro; mini/nano 03-17)

Scored as

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Artificial Analysis index

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Output speed

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Hugging Face

closed weights

## OpenAI releases · around this one

GPT-5.3-Codex

Closed

5 FEB 2026

index 170

GPT-5.3-Codex-Spark

Closed

12 FEB 2026

GPT-5.4 Thinking

Closed

5 MAR 2026

GPT-5.5 Thinking

Closed

23 APR 2026

GPT-5.6 Luna

Closed

9 JUL 2026

index 169

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Source: https://themodelindex.org/models/gpt-5-4-thinking/ · The Model Index · data as of 2026-10-01