# GPT-5.6 Cyber

> For the complete documentation index, see [llms.txt](/llms.txt). Markdown versions of documentation pages are available by appending `.md` to the page URL.

> Our most advanced cybersecurity model for authorized vulnerability research and security testing.

Model ID: `gpt-5.6-cyber`

An alias for our most advanced purpose-trained cybersecurity models, for
approved defenders conducting advanced, authorized vulnerability research,
exploit validation, and security testing.

This model requires separate approval and provisioning, you can apply to join the Daybreak program [here](https://openai.com/daybreak/). More details on pricing [here](https://developers.openai.com/api/docs/pricing).

## Model details

- Default snapshot: `gpt-5.6-cyber`
- Input modalities: text, image
- Output modalities: text
- 400,000 context window
- Maximum input tokens: 272,000
- 128,000 max output tokens
- Feb 16, 2026 knowledge cutoff
- Reasoning token support

## Pricing

Pricing is based on the number of tokens used, or other metrics based on the model type. For tool-specific models, like search and computer use, there’s a fee per tool call. See details in the [pricing page](/api/docs/pricing).

### Text tokens

| Metric | Price | Unit |
| --- | ---: | --- |
| Input | $12.5 | 1M tokens |
| Cached input | $1.25 | 1M tokens |
| Output | $75 | 1M tokens |

- Prompts with >272K input tokens are priced at 2x input and 1.5x output for the full request.
- Cache writes are billed at 1.25x the uncached input token rate.

## Endpoints

| Endpoint | Route | Support |
| --- | --- | --- |
| Live | `v1/live/sessions` | Not supported |
| Chat Completions | `v1/chat/completions` | Not supported |
| Responses | `v1/responses` | Supported |
| Realtime | `v1/realtime` | Not supported |
| Realtime translation | `v1/realtime/translations` | Not supported |
| Realtime transcription | `v1/realtime/transcription_sessions` | Not supported |
| Assistants | `v1/assistants` | Not supported |
| Batch | `v1/batch` | Not supported |
| Fine-tuning | `v1/fine-tuning` | Not supported |
| Embeddings | `v1/embeddings` | Not supported |
| Image generation | `v1/images/generations` | Not supported |
| Videos | `v1/videos` | Not supported |
| Image edit | `v1/images/edits` | Not supported |
| Speech generation | `v1/audio/speech` | Not supported |
| Transcription | `v1/audio/transcriptions` | Not supported |
| Translation | `v1/audio/translations` | Not supported |
| Moderation | `v1/moderations` | Not supported |
| Completions (legacy) | `v1/completions` | Not supported |

## Supported features

- streaming
- structured_outputs
- function_calling
- file_search
- image_input
- web_search
- prompt_caching

## Supported tools

Tools supported by this model when using the Responses API.

- web_search
- file_search
- image_generation
- code_interpreter
- hosted_shell
- apply_patch
- skills
- computer_use
- mcp
- tool_search

## Quick comparison

| Model | Input | Cached input | Output |
| --- | ---: | ---: | ---: |
| GPT-5.6 Cyber | $12.5 | $1.25 | $75 |
| GPT-5.5 | $5 | $0.5 | $30 |
| GPT-5.4 | $2.5 | $0.25 | $15 |

## Snapshots

Snapshots let you lock in a specific version of the model so that performance and behavior remain consistent. Below is a list of all available snapshots and aliases for GPT-5.6 Cyber.

- `gpt-5.6-cyber`

## Rate limits

Rate limits ensure fair and reliable access to the API by placing specific caps on requests, tokens, audio duration, or other usage within a given time period. Your usage tier determines how high these limits are set and automatically increases as you send more requests and spend more on the API.

### Standard

| Tier | RPM | TPM | Batch queue limit |
| --- | ---: | ---: | ---: |
| Tier 1 | 500 | 500,000 | 1,500,000 |
| Tier 2 | 5,000 | 1,000,000 | 3,000,000 |
| Tier 3 | 5,000 | 2,000,000 | 100,000,000 |
| Tier 4 | 10,000 | 4,000,000 | 200,000,000 |
| Tier 5 | 15,000 | 40,000,000 | 15,000,000,000 |