GPT 6 Astra Pro
5275°
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OpenAI | 1,050,000 token context | $10.00/M input, $50.00/M output. GPT-6 Astra Pro is the same underlying model as GPT-6 AstraOpens in new tab, served with reasoning.mode set to pro for higher-quality responses on complex tasks. Cost note: pro mode spends far more reasoning tokens per request, so a typical request costs several times more than the same request on GPT-6 Astra and takes much longer to complete. It is intended for hard, high-stakes problems where the extra accuracy justifies the cost. For everyday coding, agentic, and chat workloads, use GPT-6 AstraOpens in new tab instead. Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-modeOpens in new tab
Guides for this model
Open weights vs open source vs API-only: what you are actually allowed to do
How to choose an AI model in October 2026: the closed source news, then the open weights worth downloading
The 10 cheapest ChatGPT alternatives in 2026: free local models, free tiers and flat-rate plans
Captain's notes
Notes from 2026-10-13
GPT-6 Astra Pro is OpenAI's GPT-6 Astra served with reasoning mode set to pro, meaning it spends significantly more compute per request in exchange for higher accuracy on difficult problems. The context window is over one million tokens. It is aimed squarely at hard, high-stakes tasks where being right matters more than being fast or cheap.
Known for
- Pro reasoning mode pushes accuracy higher than standard GPT-6 Astra on complex tasks.
- Over one million tokens of context for very long documents or conversations.
- Vision capability alongside text reasoning.
- Same underlying model as GPT-6 Astra, so the quality ceiling is the same engine.
Watch out for
- Output costs $50 per million tokens; pro mode burns far more reasoning tokens, so real bills multiply fast.
- Requests take noticeably longer than GPT-6 Astra — not a model for latency-sensitive or high-volume work.
- Closed weights, API only; you cannot run this locally or inspect it.
Prompts to try
Audit a legal argument
Here is a contract clause and the counterparty's interpretation of it. Identify every logical gap or unsupported assumption in their reading, explain which specific wording they are relying on, and suggest the two strongest counter-arguments available to us. Clause: [paste clause]. Their interpretation: [paste interpretation].
Diagnose a failing system design
I am designing a distributed job queue that must guarantee exactly-once delivery under network partitions. Here is my current architecture: [describe it]. Walk through every failure mode you can identify, rank them by likelihood and blast radius, and propose the minimal set of changes that would make the design safe.
Reason through a hard tradeoff
My team must choose between rewriting our authentication service in Rust or keeping it in Python and adding a formal verification layer. We have three engineers, a six-month runway, and a compliance audit in eight months. Lay out the full decision tree, surface the assumptions that most change the answer, and give a final recommendation with your confidence level.
Compare with
- gpt oss 120b TurboOpen-weights model131,072 token context · $0.15/M input, $0.60/M output
- GPT-6 LunaAPI-only model1,050,000 token context · $0.10/M input, $0.50/M output
- GPT-5.6 SolAPI-only model1,050,000 token context · $4.00/M input, $20.00/M output
- GPT-6.1 SolAPI-only model1,050,000 token context · $2.00/M input, $10.00/M output
More text models from openai
Questions people ask
- Can I run GPT-6 Astra Pro locally?
- No. The weights are not public and the model is available through OpenAI's API only.
- What does GPT-6 Astra Pro cost and what is the context window?
- Pricing is $10.00 per million input tokens and $50.00 per million output tokens, with a context window of 1,050,000 tokens. Because pro reasoning mode generates many more internal reasoning tokens per request, a typical call costs several times more than the same call on GPT-6 Astra.
- What is the difference between GPT-6 Astra Pro and GPT-6 Astra?
- They are the same underlying model; the Pro variant simply runs with reasoning mode set to pro, which trades speed and cost for higher accuracy on complex tasks. OpenAI recommends GPT-6 Astra for everyday coding, agentic, and chat workloads.
Captain's verdictReserve this for the problems where a wrong answer is genuinely expensive; for everything else, GPT-6 Astra will do the job at a fraction of the cost.
Captain writes these notes from the model's own description and model card. Prices and context sizes are the provider's at the time of writing and can change.
Ranking badge
Updated Oct 22, 2026
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GPT 6 Astra Pro is a text model for the Text / LLM family listed on ModelTrends.ai, a read-only catalog of open source AI image, video and text models. Compare it with other Text / LLM models and check its heat score to see how it is trending.
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