GPT-4o
Summary
GPT-4o is a proprietary language model from OpenAI, released on 13 May 2024. It accepts text, images and PDFs and generates text, with a 128K-token context window and up to 16K output tokens per response. As of 4 Oct 2026, the lowest listed API price is $2.50 per million input tokens and $10 per million output tokens (OpenAI API), across 3 providers we track.
Omni-era GPT for multimodal chat, practical coding, and general assistants
Last verified 4 Oct 2026. Every figure on this page links to its source.
Specifications
| Developer | OpenAI |
|---|---|
| Release date | 13 May 2024 [models.dev] |
| Status | Generally available [models.dev] |
| Weights | Proprietary (API only) [models.dev] |
| Context window | 128K (128,000 tokens) [models.dev] |
| Max output | 16K tokens [models.dev] |
| Knowledge cutoff | Sept 2023 [models.dev] |
| Input | Text, images and PDFs [models.dev] |
| Output | Text [models.dev] |
| Reasoning mode | No [models.dev] |
| Tool calling | Yes [models.dev] |
| Structured output | Yes [models.dev] |
GPT-4o API pricing by provider
USD per million tokens. Sorted by input price.
| Provider | Input | Output | Cached input | Context | Source |
|---|---|---|---|---|---|
| OpenAI API gpt-4o-2024-08-06 | $2.50 | $10 | $1.25 | 128K | models.dev, 4 Oct 2026 |
| OpenAI API gpt-4o | $2.50 | $10 | $1.25 | 128K | models.dev, 4 Oct 2026 |
| OpenAI API gpt-4o-2024-11-20 | $2.50 | $10 | $1.25 | 128K | models.dev, 4 Oct 2026 |
| OpenRouter openai/gpt-4o | $2.50 | $10 | $1.25 | 128K | OpenRouter, 4 Oct 2026 |
| OpenRouter openai/gpt-4o-2024-08-06 | $2.50 | $10 | $1.25 | 128K | OpenRouter, 4 Oct 2026 |
| Vercel AI Gateway openai/gpt-4o | $2.50 | $10 | $1.25 | 128K | models.dev, 4 Oct 2026 |
| OpenRouter openai/gpt-4o-2024-11-20 | $2.50 | $10 | $1.25 | 128K | OpenRouter, 4 Oct 2026 |
| Vercel AI Gateway openai/gpt-4o-fast | $4.25 | $17 | $2.13 | 128K | models.dev, 4 Oct 2026 |
| OpenRouter openai/gpt-4o-2024-05-13 | $5 | $15 | – | 128K | OpenRouter, 4 Oct 2026 |
Frequently asked questions
What is the context window of GPT-4o?
GPT-4o has a context window of 128,000 tokens (128K) and can generate up to 16,384 tokens in a single response, according to models.dev.
How much does the GPT-4o API cost?
Through OpenAI API, GPT-4o costs $2.50 per million input tokens and $10 per million output tokens. Prices last verified 4 Oct 2026.
Is GPT-4o open source?
No. GPT-4o is a proprietary model; OpenAI has not released its weights. It is available through APIs including OpenAI API, OpenRouter, Vercel AI Gateway.
When was GPT-4o released?
OpenAI released GPT-4o on 13 May 2024, according to models.dev.
Which providers offer GPT-4o?
We track GPT-4o on 3 providers: OpenAI API, OpenRouter, Vercel AI Gateway.
Change history
No changes detected since we started tracking this model. We re-check every source daily.
Sources
- https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-4o.toml
- https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-4o-2024-08-06.toml
- https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-4o-2024-11-20.toml
- https://openrouter.ai/openai/gpt-4o
- https://openrouter.ai/openai/gpt-4o-2024-08-06
- https://github.com/sst/models.dev/blob/dev/providers/vercel/models/openai/gpt-4o.toml
- https://openrouter.ai/openai/gpt-4o-2024-11-20
- https://github.com/sst/models.dev/blob/dev/providers/vercel/models/openai/gpt-4o-fast.toml
- https://openrouter.ai/openai/gpt-4o-2024-05-13