GPT-3.5-turbo
Summary
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.
Compact GPT model for low-latency assistance and high-volume workloads
Last verified 4 Oct 2026. Every figure on this page links to its source.
Specifications
| Developer | OpenAI |
|---|---|
| Release date | 1 Mar 2023 [models.dev] |
| Status | Deprecated [models.dev] |
| Weights | Proprietary (API only) [models.dev] |
| Context window | 16K (16,385 tokens) [models.dev] |
| Max output | 4K tokens [models.dev] |
| Knowledge cutoff | 1 Sept 2021 [models.dev] |
| Input | Text [models.dev] |
| Output | Text [models.dev] |
| Reasoning mode | No [models.dev] |
| Tool calling | No [models.dev] |
| Structured output | No [models.dev] |
GPT-3.5-turbo API pricing by provider
USD per million tokens. Sorted by input price.
| Provider | Input | Output | Cached input | Context | Source |
|---|---|---|---|---|---|
| OpenRouter openai/gpt-3.5-turbo | $0.50 | $1.50 | – | 16K | OpenRouter, 4 Oct 2026 |
| Vercel AI Gateway openai/gpt-3.5-turbo | $0.50 | $1.50 | – | 16K | models.dev, 4 Oct 2026 |
Frequently asked questions
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.
Change history
No changes detected since we started tracking this model. We re-check every source daily.