GPT-6 Astra
GPT-6 AstraAlternatives?
CheaperGPT-6.1 Solmax+4%-58%$0.72Remove unsupported parameters+5
OpenGLM 5.3max-22%+16%$2.01Context: 1.05M → 1M+5Lower effortSame modelmedium-8%-11%$1.54
CheaperClaude Opus 5.5medium-3%-23%$1.34Context: 1.05M → 1M+6
BetterGemini 4 Argonhigh+6%+15%*$1.99Context: 1.05M → 1M+3GPT-6.1 Solmax+4%-58%$0.72Remove unsupported parameters+5Claude Opus 5.5medium-3%-23%$1.34Context: 1.05M → 1M+6GPT-6.1 Solmax+4%-58%$0.72Remove unsupported parameters+5Claude Opus 5.5high+5%+6%$1.82Context: 1.05M → 1M+6Gemini 4 Argonhigh+6%+15%*$1.99Context: 1.05M → 1M+3Claude Sonnet 5.5xhigh+6%+17%$2.01Context: 1.05M → 1M+6
Muse Wonder Full+6%——Context: 1.05M → 1M+1GLM 5.3maxOpen-22%+16%$2.01Context: 1.05M → 1M+5
MiMo v2.6 ProthinkingOpen-36%-92%$0.13Context: 1.05M → 1M+4
DeepSeek V4.1 Flash 1017maxOpen-37%-85%$0.26Context: 1.05M → 1M+5
Ling 3.1 FlashOpen-38%-42%$1.00Context: 1.05M → 1M+1
Step 5 PreviewthinkingOpen-38%-41%$1.03Context: 1.05M → 1M+4GPT-6.1 Solhigh-5%-82%$0.32Remove unsupported parameters+5GPT-6 Solhigh-51%-78%$0.37GPT-5.6 Solhigh-62%-53%$0.81GPT-5.5 Instant (June 2026)-77%-60%$0.69Context: 1.05M → 400KGPT-5.5high-83%-11%$1.54Prompts with >272K input tokensGPT-6 Lunahigh-92%-98%$0.029Function calling only with none · Chat Completions+3GPT-5.6 Lunahigh-95%-97%$0.044GPT-5.4 Minixhigh-96%-74%$0.45Context: 1.05M → 400KAll OpenAI models →Benchmarks
in CodingWatch 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 Terminal-Bench 4.0, GPT-6 Astra scores 59.6 vs 59.6 — about the same. It is 71% 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-6.1 Sol (cheaper), GLM 5.3 (open weights).