Misalignment monitoring can return HTTP 403 before streaming or errors after output; match misalignment_policy_violation and handle stream errors. Source ↗
No none reasoning effort›
The none reasoning effort is unsupported on GPT-6 Astra and GPT-6.1 Sol; use low instead. Source ↗
Remove unsupported sampling parameters›
When reasoning effort is not none, remove temperature, top_p and top_logprobs, plus Chat Completions logprobs or Responses output logprobs inclusion. Source ↗
FAQ
How much does GPT-6 Astra cost?›
$10 per 1M input tokens and $50 per 1M output tokens; cached input $1 per 1M. A typical benchmark task costs about $3.26 at max effort.
Is GPT-6 Astra free to use?›
There is no free API; the cheapest paid price is $10 per 1M input tokens.
How good is GPT-6 Astra, and what is it best at?›
#7 of 334 in Chat & Knowledge, #3 of 132 in Coding, #6 of 133 in Agents & Tool Use, #26 of 195 in Writing & Language, #2 of 124 in Vision & Documents. Strongest at: Coding, Agents & work tasks, Reasoning, Science, Long context, Knowledge, Vision.
Is GPT-6 Astra better than GPT-6.1 Sol?›
On Mystery Game Puzzles, GPT-6 Astra scores 84 vs 80 — higher. It is 350% more expensive per task.
How can I use GPT-6 Astra?›
Through the API of Amazon Bedrock, Azure, OpenAI.
What is the context window of GPT-6 Astra?›
1.05M tokens, with up to 128K output tokens.
When was GPT-6 Astra released? Is there a newer version?›
Released 2026-09-04. It is the current version in its line.
Is GPT-6 Astra open source?›
No, GPT-6 Astra is a closed model available through an API. The closest open-weights option here is DeepSeek V4 Pro 0813.
Can GPT-6 Astra read images?›
It accepts text and images, PDF files as input.
What is GPT-6 Astra?›
GPT-6 Astra is a closed language model from OpenAI, released Sep 2026.
What are the best alternatives to GPT-6 Astra?›
GPT-6.1 Sol (cheaper), DeepSeek V4 Pro 0813 (open weights).
OpenDeepSeek V4 Pro 0813max-49%-79%$0.67Context: 1.05M → 1M+6
OpenGLM 5.3max-61%-38%$2.01Context: 1.05M → 1M+5
OpenKimi K3max-69%-39%$2.00Context: 1.05M → 1M+4
OpenQwen3.6 35B A3Bnone-74%-97%$0.25 / $1.49Context: 1.05M → 262K
Nemotron 3 UltraunstatedOpen-76%-95%$0.50 / $2.50Context: 1.05M → 1M+1