HOW TO USE ASTRA
How to use Astra.
Choose an access route, start a bounded task, prompt clearly, control tools and cost, and verify what it returns.
Each chapter is checked against current official documentation. Where OpenAI has not documented something, the record says so rather than guessing.
RELEASED · ACCESS EXPANDING
Use GPT-6 Astra through the route that fits.
Astra is available through multiple documented routes. ChatGPT, Work, Codex, API, Copilot, Foundry, and third-party catalog access each have their own plan, account, client, or provider rules.
A route listing is not a promise that your account, plan, workspace, or region is eligible.
Official OpenAI routes lead. GitHub and Microsoft routes are labeled separately.
HowToUseAstra does not sell access to Astra. Route listings are editorial and do not promise eligibility, identical product terms, or provider endorsement.
WHERE THINGS STAND
Astra is available through several routes. Check yours before you start.
OpenAI, GitHub, and Microsoft document different access paths. Confirm the route, model label, account terms, and client before you start.
THE METHOD
Prepare the work before you prompt.
These principles are useful whether the task is a research question, a repository, a dataset, or a long-running agent.
Define success
Write the desired artifact, acceptance test, stop condition, and human approver before the first request.
Budget the search
Set time, token, tool, and cost limits. More trajectory is not the same thing as more evidence.
Checkpoint the state
Record assumptions, open questions, decisions, and artifacts so the work can be resumed or audited.
Verify independently
Use a second pass, a test, a source check, or an expert review. Keep failures visible instead of smoothing them away.
WHEN ANOTHER MODEL FITS BETTER
Choose by the job, not by the release headline.
Astra is the primary route. Use another model only when its workflow, access, or economics are a better fit.
GPT-5.6 Sol
The most direct stepping stone if your target is OpenAI’s tooling, model naming, and developer workflow.
- Why it fits
- OpenAI’s current model guidance identifies GPT-5.6 Sol as the full-capability GPT-5.6 route.
- Honest limit
- It is GPT-5.6 Sol, not GPT-6 Astra. Similar lineage does not establish Astra-level capability, access, or pricing.
Claude Fable 5.1
A strong candidate when the job is difficult coding, research, knowledge work, or a long-running agent task.
- Why it fits
- Anthropic describes Fable 5.1 as its most capable model for ambitious coding projects and knowledge work.
- Honest limit
- It is Anthropic’s model, not GPT-6 Astra. Safeguards, plan limits, retention, and actual task performance still need to be checked for your use case.
Fusion
A different answer to uncertainty: ask several models to analyze in parallel, then synthesize instead of relying on one model.
- Why it fits
- OpenRouter describes Fusion as a server-side tool for multi-model deliberation.
- Honest limit
- Fusion is an OpenRouter tool, not itself a frontier model and not GPT-6 Astra. Availability, model mix, data terms, and cost are separate.
These are editorial alternatives, not Astra and not paid placements. Their product terms and capabilities remain separate.
PRODUCT SOURCES
Product claims stay beside the action so the comparison remains inspectable.
THE GUIDE MAP
Five chapters for the work ahead.
Start with the chapter that matches your task. Access-specific guidance changes as official documentation expands.
Access and setup
Access dependentChoose ChatGPT, Work, Codex, API, Copilot, Foundry, or a verified catalog route; record the plan or eligibility gate and verify the first successful session before adding tools or claims.
Your first useful task
Access dependentStart with a bounded task, explicit success criteria, inspectable artifacts, and a clear verification path; record the exact route and configuration.
Long-horizon work and checkpoints
Access dependentSet reasoning effort, context limits, tool boundaries, checkpoints, and stop conditions; do not treat a long trajectory as proof of correctness.
Verification and failure recovery
Available nowPreserve raw outputs, independent checks, and failure notes. A fluent answer is not a verified result; recover by narrowing the task and rerunning the check.
Cost and resource control
Access dependentUse the calculator with documented prices, cached-input terms, processing mode, limits, and a stated workload assumption.
USEFUL TODAY
Start with a bounded task.
The same preparation works in Astra or another model, and makes the result easier to review.
- Choose a bounded task.Prefer a repository issue, a fixed document set, or a synthetic dataset over an open-ended “do everything” prompt.
- Freeze the inputs.Record the source files, commit, question set, allowed tools, and environment before starting.
- Define the check.Decide what a human, test suite, citation audit, or formal checker will verify.
- Capture the failure.Store what did not work, what was corrected, and whether the conclusion is supported, inconclusive, or blocked.