# GPT-3.5-turbo

> GPT-3.5-turbo is a proprietary language model from OpenAI, released on 1 Mar 2023. It accepts text and generates text, with a 16K-token context window and up to 4K output tokens per response. As of 4 Oct 2026, the lowest listed API price is $0.50 per million input tokens and $1.50 per million output tokens (OpenRouter), across 2 providers we track. OpenAI has deprecated this model.

Source page: https://www.aimodel.directory/models/gpt-3-5-turbo
Last verified: 4 Oct 2026

## Specifications

- **Developer:** OpenAI
- **Release date:** 1 Mar 2023 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-3.5-turbo.toml)
- **Status:** Deprecated (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-3.5-turbo.toml)
- **Weights:** Proprietary (API only) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-3.5-turbo.toml)
- **Context window:** 16K (16,385 tokens) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-3.5-turbo.toml)
- **Max output:** 4K tokens (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-3.5-turbo.toml)
- **Knowledge cutoff:** 1 Sept 2021 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-3.5-turbo.toml)
- **Input:** Text (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-3.5-turbo.toml)
- **Output:** Text (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-3.5-turbo.toml)
- **Reasoning mode:** No (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-3.5-turbo.toml)
- **Tool calling:** No (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-3.5-turbo.toml)
- **Structured output:** No (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-3.5-turbo.toml)

## API pricing (USD per 1M tokens)

| Provider | Input | Output | Cached input | Context |
|---|---|---|---|---|
| OpenRouter | $0.50 | $1.50 | – | 16K |
| Vercel AI Gateway | $0.50 | $1.50 | – | 16K |

## FAQ

### What is the context window of GPT-3.5-turbo?

GPT-3.5-turbo has a context window of 16,385 tokens (16K) and can generate up to 4,096 tokens in a single response, according to models.dev.

### How much does the GPT-3.5-turbo API cost?

GPT-3.5-turbo is listed from $0.50 per million input tokens and $1.50 per million output tokens (OpenRouter). Prices last verified 4 Oct 2026.

### Is GPT-3.5-turbo open source?

No. GPT-3.5-turbo is a proprietary model; OpenAI has not released its weights. It is available through APIs including OpenRouter, Vercel AI Gateway.

### When was GPT-3.5-turbo released?

OpenAI released GPT-3.5-turbo on 1 Mar 2023, according to models.dev.

### Which providers offer GPT-3.5-turbo?

We track GPT-3.5-turbo on 2 providers: OpenRouter, Vercel AI Gateway.

---
Data licensed CC BY 4.0. Cite as: AI Model Directory, "GPT-3.5-turbo", https://www.aimodel.directory/models/gpt-3-5-turbo