# GPT-4 Turbo

GPT-4 Turbo is a text generation model from OpenAI, available through the Impossibl API. Its published context window is 128,000 tokens. The advertised input rate is $10.00 per million input tokens. The advertised output rate is $30.00 per million output tokens.

- Model identifier: ` openai/gpt-4-turbo `
- Creator: OpenAI
- Model type: Text generation
- Canonical model page: [GPT-4 Turbo](<https://impossibl.com/openai/gpt-4-turbo>)
- API availability: Listed as serving through Impossibl.
- Creator release date: 2024-04-09

## Capabilities and limits

- Context window: 128,000 tokens
- Maximum output tokens: Not published in the public catalog; this is separate from the context window.
- Inputs: text, image
- Outputs: text
- Tool calling: Not published

## API access

Use ` openai/gpt-4-turbo ` as the model identifier through the Impossibl API.

Published API endpoints:

- ` /v1/chat/completions `

[API quickstart](<https://impossibl.com/docs/agent-quickstart>) · [Models and billing documentation](<https://impossibl.com/docs/models>)

## Published API prices

All rates are in USD. An unpublished rate is unknown, not zero. Workspace-specific pricing, taxes, balance-purchase fees, billing adjustments, and tool charges can affect the amount paid.

| Usage | Published base rate | Billing unit |
| --- | --- | --- |
| Input | $10.00 | per million input tokens |
| Output | $30.00 | per million output tokens |
| Cache read | Not published | per million cached input tokens |
| Cache write (default retention) | Not published | per million tokens |
| Cache write (one-hour retention) | Not published | per million tokens |
| Audio input | Not published | per million audio input tokens |

## Independent benchmarks

Source: [Artificial Analysis](<https://artificialanalysis.ai/>). Last checked: 2026-09-11T10:50:14.034Z.
Configurations are evaluated separately. API scores retain their original units. Unmeasured scores are omitted.

### GPT-4 Turbo

Source: [Evaluation source](<https://artificialanalysis.ai/models/gpt-4-turbo>)

| Benchmark | Score |
| --- | --- |
| Intelligence Index | 7.04 |
| Humanity’s Last Exam | 3.13% |
| LiveCodeBench | 29.10% |
| coding index (API) | 21.5 |
| intelligence index (API) | 7 |

Full benchmark data and breakdowns: [Complete benchmark snapshot](<https://api.impossibl.com/v1/models/openai/gpt-4-turbo/benchmarks>).


## Availability and retirement

The model is listed as serving. No retirement is announced in the current public catalog.

## Frequently asked questions

### What is GPT-4 Turbo?

GPT-4 Turbo is a text-generation model from OpenAI, available through the Impossibl API.

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

GPT-4 Turbo costs $10.00 per million input tokens and $30.00 per million output tokens through the Impossibl API. All rates are in USD.

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

GPT-4 Turbo has a 128,000-token context window through the Impossibl API.

### What inputs and outputs does GPT-4 Turbo support?

GPT-4 Turbo accepts text and image as input. GPT-4 Turbo returns text.

### How do I use GPT-4 Turbo through an API?

GPT-4 Turbo is available through the Impossibl API. Use openai/gpt-4-turbo as the model identifier with /v1/chat/completions. The quickstart explains how to create an API key and send your first request.

### When was GPT-4 Turbo released?

OpenAI released GPT-4 Turbo on April 9, 2024.

Sources: [Creator release announcement](<https://developers.openai.com/api/docs/changelog>)

## Sources and related links

Prices, limits, capabilities, endpoints, and availability come from the public Impossibl catalog. Creator documentation supplies descriptions and release dates where available; it does not override the published API offering.

- [Public Impossibl model catalog](<https://api.impossibl.com/v1/models>)
- [Full model directory as JSON](<https://impossibl.com/models.json>)
- [GPT-4 Turbo: model details and pricing](<https://impossibl.com/openai/gpt-4-turbo>)
- [Model directory](<https://impossibl.com/models>)