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A dense star-shaped lattice of glass beads and silver threads on a dark background, abstract hero artwork for GPT-6 Astra Pro

OpenAI

GPT-6 Astra Pro

GPT-6 Astra, OpenAI's GPT-6 flagship, run in pro reasoning mode for the hardest problems.

Chat with GPT-6 Astra Pro in Super AgentView pricing

What is GPT-6 Astra Pro?

GPT-6 Astra Pro runs GPT-6 Astra, OpenAI's flagship, in pro reasoning mode.

OpenAI announced it alongside Astra on September 3, 2026 for ChatGPT Pro, Business and Enterprise users, where it appears as GPT-6 Pro, the option for difficult tasks and longer-running workflows. Pro mode does more model work on each request, so it takes longer and uses more tokens than standard Astra. OpenAI's launch table reports Astra's best score at any effort level and has no separate numbers for pro mode.

Provider
OpenAI
Context window
1.05M tokens
Input
Text, Image
Reasoning
Low to max
Max output
128K tokens
Knowledge cutoff
Apr 30, 2026
Released
Sep 3, 2026

How GPT-6 Astra Pro performs

On LMArena

People compare two anonymous answers and vote for the better one. Ranked here against the other chat models you can pick in Super Agent.

LMArena has no separate entry for GPT-6 Astra Pro. It runs the same model as GPT-6 Astra in a deeper reasoning mode, and that page shows the base model's arena results.

Source: LMArena, leaderboard published . Scores move as new votes come in.

What you can do with GPT-6 Astra Pro

  • GPT-6 Astra in OpenAI's pro reasoning mode

  • Offered in ChatGPT as GPT-6 Pro for difficult, longer-running work

  • Keeps Astra's 1.05M-token context and image input

  • Thinking always on, from low to max

How to prompt GPT-6 Astra Pro

  • Save it for one hard problem at a time and expect to wait.
  • Spell out what a correct answer must include so the extra reasoning goes where it counts.
  • Draft with GPT-6 Astra and ask Astra Pro to check the final version.

Where GPT-6 Astra Pro fits best

  • The hardest question in a project

  • High-stakes research and analysis

  • Reviewing a finished plan for errors

  • Problems other models keep getting wrong

How GPT-6 Astra Pro compares

GPT-6 Astra Pro compared with other chat models on Flashloop
ModelLMArena textLMArena codingContext windowReasoning
GPT-6 Astra ProNoNo1.05M tokensLow to max
GPT-6.1 Sol1480#271537#141.05M tokensLow to max
GPT-6.1 Sol ProNoNo1.05M tokensLow to max
Claude Sonnet 5.51478#291528#261M tokensLow to max
GPT-6 Luna1442#911507#651.05M tokensOff to max

Good to know before you start

  • Takes longer to answer than GPT-6 Astra
  • Uses more tokens than Astra on the same request
  • Wasted on simple requests; use GPT-6 Astra or a lighter model for those

Start chatting with GPT-6 Astra Pro

Chat with GPT-6 Astra Pro in Super Agent

  1. Select GPT-6 Astra Pro

    Open Super Agent on Flashloop and choose GPT-6 Astra Pro in the model picker.

  2. Enter your prompt

    Ask for what you need: an answer, a plan, or the images and videos you want the agent to make.

  3. Send and keep going

    Send the message. GPT-6 Astra Pro answers in Super Agent and runs any generations you asked for.

Questions about GPT-6 Astra Pro

Is GPT-6 Astra Pro a different model from GPT-6 Astra?

No. It is the same model with OpenAI's reasoning mode set to pro.

When should I choose GPT-6 Astra Pro?

For difficult tasks and longer-running work where you can accept higher latency. For everyday work, standard GPT-6 Astra is the faster choice.

How much slower is GPT-6 Astra Pro?

OpenAI says pro mode does more model work and comes with higher latency and token usage. It doesn't publish a fixed slowdown, so the wait depends on the task.

What effort does Super Agent start GPT-6 Astra Pro at?

Medium. You can choose low, medium, high, extra high or max.

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