GPT-6 Astra
GPT-6 AstraAlternatives?
CheaperClaude Opus 5unstated+4%-50%$5 / $25Context: 1.05M → 1M
OpenGLM 5.3unstated-1%-89%$1.40 / $4.40Context: 1.05M → 1M+5CheaperClaude Opus 5.5unstated+2%-60%$4 / $20Context: 1.05M → 1M+6
CheaperGrok 4.7unstatedsame-85%$2 / $6Context: 1.05M → 500K+5
CheaperMuse Spark 1.3unstatedsame-90%$1.25 / $4.25Context: 1.05M → 1M+6Claude Opus 5unstated+4%-50%$5 / $25Context: 1.05M → 1MClaude Opus 5.5unstated+2%-60%$4 / $20Context: 1.05M → 1M+6Grok 4.7unstatedsame-85%$2 / $6Context: 1.05M → 500K+5Muse Spark 1.3unstatedsame-90%$1.25 / $4.25Context: 1.05M → 1M+6GPT-6 Solunstatedsame-80%$2 / $10Claude Opus 5unstated+4%-50%$5 / $25Context: 1.05M → 1MClaude Fable 5.1unstated+3%same$10 / $50Context: 1.05M → 1M+6GLM 5.3unstatedOpen-1%-89%$1.40 / $4.40Context: 1.05M → 1M+5
Kimi K3unstatedOpen-4%-70%$3 / $15Context: 1.05M → 1M+4Kimi K2.6unstatedOpen-5%-91%$0.95 / $4Context: 1.05M → 256KGLM 5.2unstatedOpen-6%-89%$1.40 / $4.40Context: 1.05M → 1M+1
DeepSeek V4 Pro 0813unstatedOpen-9%-90%$1.32 / $3.96Context: 1.05M → 1M+6GPT-6 Solunstatedsame—$2 / $10GPT-5.6 Solunstated-1%—$4 / $20GPT-5.4unstated-5%—$2.50 / $15GPT-5.5unstated-6%—$5 / $30Prompts with >272K input tokensGPT-5.6 Terraunstated-6%—$2 / $12Prompts with >272K input tokensGPT-5.6 Lunaunstated-9%—$0.20 / $1.20GPT-5.4 Miniunstated-12%—$0.75 / $4.50Context: 1.05M → 400KGPT-5 (2025-08-07)unstated-12%—$1.25 / $10Context: 1.05M → 400KAll OpenAI models →Benchmarks
in Writing & LanguageWatch 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 $1.54 at medium 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?›
#9 of 334 in Chat & Knowledge, #8 of 132 in Coding, #11 of 133 in Agents & Tool Use, #26 of 195 in Writing & Language, #4 of 124 in Vision & Documents. Strongest at: Coding, Agents & work tasks, Reasoning, Science, Long context, Knowledge, Vision.
Is GPT-6 Astra better than Muse Spark 1.3?›
On EQ-Bench Longform Creative Writing 1.11, GPT-6 Astra scores 82.8 vs 82.8 — about the same.
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?›
Claude Opus 5 (cheaper), GLM 5.3 (open weights).