GPT-6 Astra

Overview

GPT-6 Astra is a general-purpose model in the official OpenAI model catalog, with model ID gpt-6-astra. It should be evaluated for text understanding, generation, coding assistance, structured processing and multimodal product capabilities rather than single-purpose image generation, transcription or TTS.

Best for

Use GPT-6 Astra as a core candidate for assistants, complex Q&A, coding, long-form analysis, workflow automation and vision-enabled applications. Before production, compare context length, pricing, latency, tool support and real output quality.

Official specifications and pricing

Supports text and image input with text output, a 1,050,000-token context window and up to 128,000 output tokens. The knowledge cutoff is 2026-04-30; the official model page does not specify a release date.

reasoning.effort supports low, medium, high, xhigh and max. Streaming, function calling and structured outputs are supported, with tools available through the Responses API.

Standard text pricing per million tokens is $10 input, $1 cached input, $12.50 cache writes and $50 output. Prompts exceeding 272K input tokens incur 2x input and cache rates and 1.5x output rates for the full request. Batch and Flex cost 50% of Standard rates; Fast mode costs 2x the applicable rates. Tool calls may incur additional fees.

Audio, video and fine-tuning are not supported. Image generation is a Responses API tool capability, not direct image output from the model.