GPT-6 Astra
GPT-6 AstraAlternatives?
CheaperClaude Opus 5unstated+31%-50%$5 / $25Context: 1.05M → 1M
OpenKimi K3unstatedsame-70%$3 / $15Context: 1.05M → 1M+4
CheaperGemini 3.1 Pro Previewunstated+22%-78%$2 / $12Context: 1.05M → 1M+1CheaperGemini 4 Argonunstated+21%-80%*$2 / $10Context: 1.05M → 1M+3CheaperGemini 3 Flash Previewunstated+15%-94%$0.50 / $3Context: 1.05M → 1MClaude Opus 5unstated+31%-50%$5 / $25Context: 1.05M → 1MGemini 3.1 Pro Previewunstated+22%-78%$2 / $12Context: 1.05M → 1M+1Gemini 4 Argonunstated+21%-80%*$2 / $10Context: 1.05M → 1M+3Gemini 3 Flash Previewunstated+15%-94%$0.50 / $3Context: 1.05M → 1MClaude Opus 4.7unstated+13%-50%$5 / $25Context: 1.05M → 1MClaude Opus 5unstated+31%-50%$5 / $25Context: 1.05M → 1MGemini 3.1 Pro Previewunstated+22%-78%$2 / $12Context: 1.05M → 1M+1Gemini 4 Argonunstated+21%-80%*$2 / $10Context: 1.05M → 1M+3Claude Fable 5unstated+16%same$10 / $50Context: 1.05M → 1MGemini 3 Flash Previewunstated+15%-94%$0.50 / $3Context: 1.05M → 1MKimi K3unstatedOpensame-70%$3 / $15Context: 1.05M → 1M+4
MiniMax M3unstatedOpen-5%-97%$0.30 / $1.20Context: 1.05M → 524K+2
MiMo v2.6 ProunstatedOpen-7%-97%$0.43 / $0.87Context: 1.05M → 1M+4
Hy4 previewOpen-11%-94%$0.83 / $2.50Context: 1.05M → 1M+1
GLM 5.3unstatedOpen-12%-89%$1.40 / $4.40Context: 1.05M → 1M+5GPT-5.1unstated+9%—$1.25 / $10Context: 1.05M → 400KGPT-5.2unstated+3%—$1.75 / $14Context: 1.05M → 400KGPT-5unstated+2%—$1.25 / $10Context: 1.05M → 400KGPT-5.5unstatedsame—$5 / $30Prompts with >272K input tokensGPT-6.1 Solunstatedsame—$2 / $10Remove unsupported parameters+5o3unstated-2%—$2 / $8Context: 1.05M → 200KGPT-6 Solunstated-3%—$2 / $10GPT-6 Lunaunstated-8%—$0.10 / $0.50Function calling only with none · Chat Completions+3All OpenAI models →Benchmarks
in Chat & KnowledgeWatch 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 GPT-6.1 Sol?›
On Vals MedCode, GPT-6 Astra scores 48.5 vs 48.8 — 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 Kimi K3.
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), Kimi K3 (open weights).