# GPT-5.5

> GPT-5.5 is a proprietary language model from OpenAI, released on 23 Apr 2026. It accepts text, images and PDFs and generates text, with a 1.1M-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 (OpenAI API), across 7 providers we track.

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

## Specifications

- **Developer:** OpenAI
- **Release date:** 23 Apr 2026 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-5.5.toml)
- **Status:** Generally available (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-5.5.toml)
- **Weights:** Proprietary (API only) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-5.5.toml)
- **Context window:** 1.1M (1,050,000 tokens) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-5.5.toml)
- **Max output:** 128K tokens (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-5.5.toml)
- **Knowledge cutoff:** 1 Dec 2025 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-5.5.toml)
- **Input:** Text, images and PDFs (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-5.5.toml)
- **Output:** Text (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-5.5.toml)
- **Reasoning mode:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-5.5.toml)
- **Tool calling:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-5.5.toml)
- **Structured output:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-5.5.toml)

## API pricing (USD per 1M tokens)

| Provider | Input | Output | Cached input | Context |
|---|---|---|---|---|
| OpenAI API | $5 | $30 | $0.50 | 1.1M |
| Databricks | $5 | $30 | $0.50 | 1.1M |
| Azure AI Foundry | $5 | $30 | $0.50 | 1.1M |
| OpenRouter | $5 | $30 | $0.50 | 1.1M |
| Vercel AI Gateway | $5 | $30 | $0.50 | 1M |
| Amazon Bedrock | $5.50 | $33 | $0.55 | 1M |
| Vercel AI Gateway | $12.50 | $75 | $1.25 | 1M |
| Snowflake Cortex | – | – | – | 1.1M |

## FAQ

### What is the context window of GPT-5.5?

GPT-5.5 has a context window of 1,050,000 tokens (1.1M) and can generate up to 128,000 tokens in a single response, according to models.dev.

### How much does the GPT-5.5 API cost?

Through OpenAI API, GPT-5.5 costs $5 per million input tokens and $30 per million output tokens. Prices last verified 4 Oct 2026.

### Is GPT-5.5 open source?

No. GPT-5.5 is a proprietary model; OpenAI has not released its weights. It is available through APIs including OpenAI API, Databricks, Azure AI Foundry, OpenRouter.

### When was GPT-5.5 released?

OpenAI released GPT-5.5 on 23 Apr 2026, according to models.dev.

### Which providers offer GPT-5.5?

We track GPT-5.5 on 7 providers: OpenAI API, Databricks, Azure AI Foundry, OpenRouter, Vercel AI Gateway, Amazon Bedrock, Snowflake Cortex.

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Data licensed CC BY 4.0. Cite as: AI Model Directory, "GPT-5.5", https://www.aimodel.directory/models/gpt-5-5