Sign up
All models
GPT-6 Astra

GPT-6 Astra

Frontier Vision OpenAI

GPT-6 Astra is OpenAI's most capable model, built for the hardest end-to-end work: complex reasoning, coding, computer use, research and document creation. Features a 1.05M context window, 128k output tokens, and reasoning token support.

Try on Simtheory
Qwen 3.8 Max Frontier Claude 4.5 Sonnet Frontier Claude 4.5 Sonnet (thinking) Frontier Claude 4.6 Opus Frontier Claude 4.6 Opus Max Frontier Claude 4.6 Sonnet Frontier Claude 4.6 Sonnet Max Frontier Claude 4.7 Opus Frontier Claude 4.7 Opus Max Frontier Claude Fable 5 Frontier

Specifications

Context window 1,050,000 tokens
Max output 128,000 tokens
Knowledge cutoff April 2026
Multipart messages Yes
Vision capabilities Yes

Default Parameters

Temperature 0.3
Top P 1.0
Frequency penalty 0.0
Presence penalty 0.0

More from OpenAI

GPT-6 Astra (thinking)

GPT-6 Astra (thinking)

Frontier

GPT-6 Astra configured with high reasoning effort for the hardest end-to-end professional work.

1,050,000 ctx 128,000 out
GPT-5.6 Luna

GPT-5.6 Luna

GPT-5.6 Luna is optimized for cost-sensitive, high-volume workloads. Features 1.05M context window, 128k output tokens, and reasoning token support. Roughly …

1,050,000 ctx 128,000 out
GPT-5.6 Luna (thinking)

GPT-5.6 Luna (thinking)

GPT-5.6 Luna configured with high reasoning effort. Optimized for cost-sensitive workloads requiring deeper thinking.

1,050,000 ctx 128,000 out