Model
GPT-6 Astra.
Power
£££
API cost
by OpenAI · released 3 September 2026
In plain English
OpenAI's model for the hardest generally available work, and its most expensive.
Good for
Difficult research, coding, computer use, and documents where a weaker model would change the result.
Things to be aware of
Using Astra to pull out simple information or write routine summaries is a poor use of money. Luna does that for about a hundredth of the price.
What OpenAI says
“OpenAI calls Astra “our most capable model for the most demanding work”.”
Seen here: OpenAI, GPT-6 announcement, September 2026
Independent score
2nd of 40+ models
Artificial Analysis
artificialanalysis.ai/models/comparisons
What everyone else says
Reuters gave monitoring and agent safety as much attention as performance. That is useful when most launch coverage leads with benchmark scores. Reuters, 3 September 2026
- Context window
- 1.1M tokens
- roughly 800,000 words
- Knows up to
- April 2026
- Training data generally up to this date
- Run it yourself
- No, online only
- API price
- $10 in / $50 out
- per million tokens