# GPT-4 Turbo

> GPT-4 Turbo is a proprietary language model from OpenAI, released on 6 Nov 2023. It accepts text and images and generates text, with a 128K-token context window and up to 4K output tokens per response. As of 4 Oct 2026, the lowest listed API price is $10 per million input tokens and $30 per million output tokens (OpenRouter), across 1 provider we track. OpenAI has deprecated this model.

Source page: https://www.aimodel.directory/models/gpt-4-turbo
Last verified: 4 Oct 2026

## Specifications

- **Developer:** OpenAI
- **Release date:** 6 Nov 2023 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-4-turbo.toml)
- **Status:** Deprecated (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-4-turbo.toml)
- **Weights:** Proprietary (API only) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-4-turbo.toml)
- **Context window:** 128K (128,000 tokens) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-4-turbo.toml)
- **Max output:** 4K tokens (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-4-turbo.toml)
- **Knowledge cutoff:** Dec 2023 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-4-turbo.toml)
- **Input:** Text and images (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-4-turbo.toml)
- **Output:** Text (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-4-turbo.toml)
- **Reasoning mode:** No (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-4-turbo.toml)
- **Tool calling:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-4-turbo.toml)
- **Structured output:** No (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-4-turbo.toml)

## API pricing (USD per 1M tokens)

| Provider | Input | Output | Cached input | Context |
|---|---|---|---|---|
| OpenRouter | $10 | $30 | – | 128K |

## FAQ

### What is the context window of GPT-4 Turbo?

GPT-4 Turbo has a context window of 128,000 tokens (128K) and can generate up to 4,096 tokens in a single response, according to models.dev.

### How much does the GPT-4 Turbo API cost?

GPT-4 Turbo is listed from $10 per million input tokens and $30 per million output tokens (OpenRouter). Prices last verified 4 Oct 2026.

### Is GPT-4 Turbo open source?

No. GPT-4 Turbo is a proprietary model; OpenAI has not released its weights. It is available through APIs including OpenRouter.

### When was GPT-4 Turbo released?

OpenAI released GPT-4 Turbo on 6 Nov 2023, according to models.dev.

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Data licensed CC BY 4.0. Cite as: AI Model Directory, "GPT-4 Turbo", https://www.aimodel.directory/models/gpt-4-turbo