# GPT Chat Latest

> GPT Chat Latest is a proprietary language model from OpenAI, released on 5 May 2026. It accepts text, images and PDFs and generates text, with a 400K-token context window and up to 128K output tokens per response. As of 4 Oct 2026, the lowest listed API price is $5 per million input tokens and $30 per million output tokens (Azure AI Foundry), across 1 provider we track.

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

## Specifications

- **Developer:** OpenAI
- **Release date:** 5 May 2026 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/azure/models/gpt-chat-latest.toml)
- **Status:** Preview (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/azure/models/gpt-chat-latest.toml)
- **Weights:** Proprietary (API only) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/azure/models/gpt-chat-latest.toml)
- **Context window:** 400K (400,000 tokens) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/azure/models/gpt-chat-latest.toml)
- **Max output:** 128K tokens (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/azure/models/gpt-chat-latest.toml)
- **Knowledge cutoff:** 1 Dec 2025 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/azure/models/gpt-chat-latest.toml)
- **Input:** Text, images and PDFs (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/azure/models/gpt-chat-latest.toml)
- **Output:** Text (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/azure/models/gpt-chat-latest.toml)
- **Reasoning mode:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/azure/models/gpt-chat-latest.toml)
- **Tool calling:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/azure/models/gpt-chat-latest.toml)
- **Structured output:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/azure/models/gpt-chat-latest.toml)

## API pricing (USD per 1M tokens)

| Provider | Input | Output | Cached input | Context |
|---|---|---|---|---|
| Azure AI Foundry | $5 | $30 | $0.50 | 400K |

## FAQ

### What is the context window of GPT Chat Latest?

GPT Chat Latest has a context window of 400,000 tokens (400K) and can generate up to 128,000 tokens in a single response, according to models.dev.

### How much does the GPT Chat Latest API cost?

GPT Chat Latest is listed from $5 per million input tokens and $30 per million output tokens (Azure AI Foundry). Prices last verified 4 Oct 2026.

### Is GPT Chat Latest open source?

No. GPT Chat Latest is a proprietary model; OpenAI has not released its weights. It is available through APIs including Azure AI Foundry.

### When was GPT Chat Latest released?

OpenAI released GPT Chat Latest on 5 May 2026, according to models.dev.

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