GPT-6 Astra

OpenAI

Our most capable model, built for the hardest end-to-end work.

Model page

Specs

Model

Family
GPT-6
Variant
Astra
Weights
Proprietary

Limits

Context
1,050,000 tokens
Max output
128,000 tokens

Modalities

Input
Text Image
Output
Text

Pricing

Input
$10 / 1M
Output
$50 / 1M
Cache read
$1 / 1M
Cache write
$12.5 / 1M

Capabilities

Reasoning
Yes
Reasoning control
Effort levels
Tool calling
Yes
Attachments
Yes

Dates

Released
3 Sept 2026
Knowledge cutoff
30 Apr 2026

Sparks of Weight-Space Programming: LLMs can natively read & write neural network weights

We find that frontier LLMs are surprisingly good at natively reading and writing neural network weights, well past what we’d expect from humans or conventional algorithms.

Rikiya Takehi, Jayden Teoh, Alex Zhang, and Omar Khattab
rikiyat.github.io

Astra for Coding: Why Are We Doing This Again?

Some thoughts on Astra and newfangled long-horizon models.

Armin Ronacher
lucumr.pocoo.org

Astra vs. The Boys: A Tale of 200 PRs

One Queue bug, an unreasonable number of agents, and 207 pull requests in three days. A story about AI audit, human review, and a GitHub runner quota that gave up.

Michael Arnaldi
effect.website

Rethinking skills and prompts for GPT-6 Astra

Coding agents have come a long way, and best practices are changing fast. What used to require a lot of handholding and scaffolding no longer does.

eric provencher@pvncher
x.com

GPT-6 Astra: A new generation of intelligence

We’re introducing GPT‑6 Astra, the world’s most intelligent and aligned model.

OpenAI
openai.com

GPT-6 Astra: an automated AI Engineer you can hire for <$6 an hour

We spent 20B+ tokens of GPT-6 Astra to explore everything. Here’s our learnings.

Latent.Space
latent.space

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