# GPT-4o

> OpenAI's first "omni" model — one network reasoning across text, vision, and audio in real time.

- Maker: OpenAI
- Line: GPT (Flagship / Thinking)
- Canonical page: https://ai-tldr.dev/models/gpt-4o/
- Updated: 2026-06-18

## In short

GPT-4o is OpenAI's first "omni" model — one network reasoning across text, vision, and audio in real time. OpenAI released it on 13 May 2024 as an API-only model. It has a 128K-token context window and costs $5.00 per million input tokens and $15.00 per million output tokens. You can use it through OpenAI.

## Facts

| Fact | Value | Source |
| --- | --- | --- |
| Context window | 128K (max output 16K) | [1] |
| Input price | $5.00 per million tokens | [2] |
| Output price | $15.00 per million tokens | [2] |
| Licence | Proprietary · API only | [1] |
| Released | 13 May 2024 | [3] |
| Parameters | Not disclosed | [1] |
| Knowledge cutoff | October 2023 | [1] |

## Sources

1. [GPT-4o model page — OpenAI docs](https://platform.openai.com/docs/models/gpt-4o)
2. [GPT-4o — Wikipedia (specs, pricing, history)](https://en.wikipedia.org/wiki/GPT-4o)
3. [Hello GPT-4o — official announcement](https://openai.com/index/hello-gpt-4o/)

## Overview

GPT-4o ("o" for "omni") was OpenAI's flagship model, announced on May 13, 2024. It was the first OpenAI model trained end-to-end as a single network across text, vision, and audio, so all inputs and outputs flow through the same neural network instead of stitching together separate transcription, text, and speech models. That design let GPT-4o respond to audio in as little as 232 milliseconds (about 320ms on average) — close to human conversational latency — and powered ChatGPT's natural, interruptible Advanced Voice Mode.

On text and code, GPT-4o roughly matched the older GPT-4 Turbo while being faster and cheaper, with notably better performance on non-English languages (it supports over 50 languages). On OpenAI's own reproducible simple-evals harness, the gpt-4o-2024-05-13 snapshot scored 87.2% on MMLU, 91.0% on HumanEval coding, 76.6% on the MATH benchmark, and 49.9% on GPQA. It had a 128K-token context window and an October 2023 knowledge cutoff. The launch snapshot capped output at 4,096 tokens; the later gpt-4o-2024-08-06 snapshot raised that to 16,384.

GPT-4o launched in the API at $5.00 per million input tokens and $15.00 per million output tokens; OpenAI cut that roughly in half (to $2.50 / $10.00) later in 2024. It anchored ChatGPT — including the free tier — for over a year before being superseded by the o-series reasoning models and GPT-5. GPT-4o was retired from ChatGPT on February 13, 2026, though it remained available in the API after that, with OpenAI pointing users to newer GPT-5.x models.

## Benchmarks

- MMLU: 87.2% ([source](https://raw.githubusercontent.com/openai/simple-evals/main/README.md))
- HumanEval (coding): 91% ([source](https://raw.githubusercontent.com/openai/simple-evals/main/README.md))
- MATH: 76.6% ([source](https://raw.githubusercontent.com/openai/simple-evals/main/README.md))
- GPQA: 49.9% ([source](https://raw.githubusercontent.com/openai/simple-evals/main/README.md))
- MGSM (multilingual math): 89.9% ([source](https://raw.githubusercontent.com/openai/simple-evals/main/README.md))
- DROP (F1, 3-shot): 83.7% ([source](https://raw.githubusercontent.com/openai/simple-evals/main/README.md))
- SimpleQA: 39% ([source](https://raw.githubusercontent.com/openai/simple-evals/main/README.md))

## Pricing

- Input: $5.00 per million tokens
- Output: $15.00 per million tokens

Launch (May 2024) API price; OpenAI later cut it to $2.50 / $10.00 per million tokens.

Source: https://en.wikipedia.org/wiki/GPT-4o

## Strengths

- Native omni multimodality — text, image and audio handled by one end-to-end model
- Real-time voice: ~232ms audio response (320ms average), close to human latency
- Strong, broad coding (91.0% HumanEval) and general knowledge (87.2% MMLU)
- Large 128K-token context window
- Much faster and cheaper than the GPT-4 Turbo it replaced (50% lower API price at launch)
- Strong multilingual performance across 50+ languages

## Best for

- Real-time voice assistants and conversational agents (Advanced Voice Mode)
- General coding, code generation and debugging
- Multilingual chat, translation and summarization
- Vision tasks: reading charts, diagrams, screenshots and documents
- Long-document understanding within the 128K context window
- High-volume chat applications where latency and cost matter

## How to access

- [OpenAI](https://platform.openai.com/docs/models/gpt-4o) — model id `gpt-4o-2024-05-13`

## GPT (Flagship / Thinking) versions

- [GPT-5.5](https://ai-tldr.dev/models/gpt-5-5/) (23 April 2026)
- [GPT-5.4](https://ai-tldr.dev/models/gpt-5-4/) (5 March 2026)
- [GPT-5.2](https://ai-tldr.dev/models/gpt-5-2/) (11 December 2025)
- [GPT-5.1](https://ai-tldr.dev/models/gpt-5-1/) (12 November 2025)
- [GPT-5](https://ai-tldr.dev/models/gpt-5/) (7 August 2025)
- GPT-4o (13 May 2024) — this page

## FAQ

### What does the "o" in GPT-4o stand for?

"o" stands for "omni." GPT-4o was OpenAI's first model trained end-to-end as a single network across text, vision, and audio, so one neural network handles all inputs and outputs instead of chaining separate speech, text, and image models.

### What were GPT-4o's benchmark scores?

On OpenAI's reproducible simple-evals harness, the gpt-4o-2024-05-13 snapshot scored 87.2% on MMLU, 91.0% on HumanEval, 76.6% on MATH, 49.9% on GPQA, 89.9% on MGSM, and 83.7% F1 on DROP.

### How much did GPT-4o cost?

At launch in May 2024 it was $5.00 per million input tokens and $15.00 per million output tokens — 50% cheaper than GPT-4 Turbo. OpenAI later cut the price to $2.50 / $10.00 per million tokens.

### Is GPT-4o still available?

It was retired from ChatGPT on February 13, 2026 but remained available in the API after that. OpenAI recommends newer GPT-5.x models as successors.

## Links

- [Hello GPT-4o — official announcement](https://openai.com/index/hello-gpt-4o/)
- [GPT-4o model page — OpenAI docs](https://platform.openai.com/docs/models/gpt-4o)
- [openai/simple-evals — benchmark results](https://raw.githubusercontent.com/openai/simple-evals/main/README.md)
- [GPT-4o — Wikipedia (specs, pricing, history)](https://en.wikipedia.org/wiki/GPT-4o)
- [Retiring GPT-4o and other ChatGPT models](https://help.openai.com/en/articles/20001051-retiring-gpt-4o-and-other-chatgpt-models)

Source: AI/TLDR LLM registry, https://ai-tldr.dev/models/gpt-4o/