GPT-6 Astra
OpenAI’s flagship for deep research, science and end-to-end engineering.
GPT-6 Astra is OpenAI’s flagship model for demanding end-to-end work. It is suited for advanced analysis, software engineering, deep research, scientific work and document creation, with particular strengths in long-horizon tasks.
- Provider
- OpenAI
- Type
- Language model
- Released
- Sep 4, 2026
- Context window
- 1.1M tokens
- Max output
- 128K tokens
- Price
- $10.00 input / $50.00 output per 1M tokens
- Input
- text, image, file
- Output
- text
- Open weights
- No
- Knowledge cutoff
- Apr 30, 2026
Best for
- Reasoning
- Math & science
- Research
- Coding
- Agents
- Enterprise
Strengths
- Highest published GPQA Diamond score
- Scientific reasoning
- Deep research
More from OpenAI
- GPT-6.1 Sol — OpenAI. Mid-tier GPT-6 model with excellent cost per task for agentic coding.
- GPT-6 Luna — OpenAI. Fast, cost-efficient GPT-6 tier for chat, classification and light agents.
- GPT-5.6 Terra — OpenAI. Balanced GPT-5.6 model for everyday coding and reasoning.
- gpt-oss-120b — OpenAI. OpenAI’s Apache-2.0 open-weight reasoning model; runs on a single 80GB GPU.
- gpt-oss-20b — OpenAI. Compact open-weight reasoning model that runs on consumer hardware.
- GPT-5.4 Image 2 — OpenAI. OpenAI’s native image generation and editing model.
- text-embedding-3-large — OpenAI. OpenAI’s most capable embedding; the default in countless RAG stacks.
- text-embedding-3-small — OpenAI. Cheap, fast OpenAI embedding for high-volume indexing.
Tools that use it
- Codex — OpenAI. OpenAI’s cloud and CLI coding agent.
- Azure AI Foundry — Microsoft. Build and run AI apps on Azure.
- ChatGPT — OpenAI. The most widely used AI assistant.