Openai

gpt-6-astra

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openai/gpt-6-astra

ChatVisionFilesToolsSystem promptReasoning

Context

1.1M

Max output

128K

Input / 1M

$10.00

Output / 1M

$50.00

Cached / 1M

$1.00

Cutoff

Apr 2026

About this model

GPT-6 Astra is OpenAI's most capable broadly deployed model, built for the hardest end-to-end work. It excels at complex reasoning, coding, computer use, research, and document creation, and is OpenAI's first model to reach the Critical level of cybersecurity capability under its Preparedness Framework.

Best suited for

Complex reasoning, multi-step problem solving, coding and software engineering, computer use, agentic workflows, research, and document creation.

Built-in tools

Image generationWeb searchGtwy web search

Hosted by the gateway — enable them per request without wiring your own endpoint.

Capabilities

Vision

Accepts images alongside text in the same message.

Files

Accepts file attachments — PDFs, transcripts, spreadsheets.

Tools

Native function calling, so agents can invoke your endpoints.

System prompt

Honours a dedicated system role, separate from the user turn.

Reasoning

Emits a separate thinking pass before the answer.

Supported parameters

max_tokensMax Tokens Limit

Specifies the maximum number of text units (tokens) allowed in a response, limiting its length.

tools

Lists tool definitions or capabilities available to the model.

tool_choice

Decides whether to use tools or just the model for generating responses.

response_type

Defines the format or type of the generated response.

parallel_tool_calls

Enables parallel execution of tools, allowing multiple tools to run simultaneously.

reasoning

Controls the level of reasoning used by the model.

stream

Sends the response in real-time as it's being generated.

service_tier