GPT-6 Astra
GPT-6 AstraAlternatives?
CheaperGPT-5.6 Solxhighsame-31%$1.18
OpenGLM 5.3maxsame+16%$2.01Context: 1.05M → 1M+5
CheaperKimi K3unstatedOpen-30%-70%$3 / $15Context: 1.05M → 1M+4CheaperGPT-5.4medium-43%-72%$2.50 / $15
CheaperMuse Wonderhigh-43%-60%$4 / $20Context: 1.05M → 1M+6GPT-5.6 Solxhighsame-31%$1.18Kimi K3unstatedOpen-30%-70%$3 / $15Context: 1.05M → 1M+4GPT-5.4medium-43%-72%$2.50 / $15Muse Wonderhigh-43%-60%$4 / $20Context: 1.05M → 1M+6
Claude Opus 4.7high-49%-50%$5 / $25Context: 1.05M → 1MGLM 5.3maxOpensame+16%$2.01Context: 1.05M → 1M+5Kimi K3unstatedOpen-30%-70%$3 / $15Context: 1.05M → 1M+4
MiMo v2.6 ProthinkingOpen-54%-92%$0.13Context: 1.05M → 1M+4
DeepSeek V4 Pro 0813highOpen-85%-90%$1.32 / $3.96Context: 1.05M → 1M+6GLM 5.2maxOpen-87%-15%$1.47Context: 1.05M → 1M+1GPT-5.5xhigh-29%+53%$2.63Prompts with >272K input tokensGPT-5.6 Solhigh-34%-53%$0.81GPT-5.4medium-43%—$2.50 / $15GPT-5.2medium-90%—$1.75 / $14Context: 1.05M → 400KGPT OSS 120BunstatedOpen-192%—$0.03 / $0.15Context: 1.05M → 131K+1GPT-6.1 Solmediumn/a—$0.21Remove unsupported parameters+5GPT-6 Lunamediumn/a—$0.017Function calling only with none · Chat Completions+3GPT-6 Solmediumn/a—$0.25All OpenAI models →Watch out 3
Monitoring can return HTTP 403›
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 $1.73 at high 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?›
#8 of 334 in Chat & Knowledge, #7 of 132 in Coding, #9 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 Claude Opus 5.5?›
On Lech Mazur Short-Story, GPT-6 Astra scores 3.4 vs 3.7 — about the same. It is 5% cheaper 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 GLM 5.3.
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-5.6 Sol (cheaper), GLM 5.3 (open weights).