Turning ChatGPT into a Deterministic Flight-Risk Runtime (FRR Demo + GitHub Repo)

Most people treat ChatGPT as a conversational model.

I wanted to know what happens if you force it to behave like a deterministic execution engine instead.

To test this idea, I built a miniature Flight Readiness Review (FRR) Runtime that runs entirely inside ChatGPT —

no API, no tools, no plugins, no backend — just structure and constraints.

And surprisingly, it works extremely well.

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🚀 Why Build a Deterministic Runtime Inside an LLM?

LLMs are fuzzy by nature:

• They improvise
• They drift
• They sometimes hallucinate

So I wanted to push them to the opposite extreme:

Can an LLM execute a deterministic pipeline with reproducible outputs

even in a free-form chat environment?

The answer is yes, as long as the structure is strong enough.

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🧠 What the FRR Runtime Actually Does

The FRR Runtime processes a structured telemetry block

(winds, pressure, pump vibration, IMU drift, etc.)

and performs an 8-step deterministic reasoning loop:

1. Parse input
2. Normalize variables
3. Factor Engine (F1–F12)
4. Global RiskMode
5. Subsystem evaluation
6. KernelBus arbitration
7. Counterfactual reasoning
8. Produce a strict FRR_Result block

No chat.

No narrative.

No deviation.

Same input → same output.

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📡 Real-Case Replay Tests (Not Simulations)

To test stability, I ran the runtime against several well-known launch scenarios:

• ❄ Cold O-ring resilience failure (Challenger-style) → clear NO-GO
• 🔥 COPV thermal instability (AMOS-6-style) → NO-GO
• 🌬 High wind shear with stable propulsion → HOLD

The point is not aerospace accuracy —

the point is that the LLM stayed deterministic,

followed the pipeline, and never drifted.

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🎥 Demo Video (3 minutes)

Here is the FRR Runtime running in the ChatGPT client:

https://youtu.be/9R6wc-LVzSc

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📦 GitHub Repo

Including the soft-system prompt, full FRR specification, and sample telemetry inputs:

https://github.com/yuer-dsl/qtx-frr-runtime

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🔍 Why This Matters Beyond This Demo

This experiment suggests something important:

LLMs can operate as deterministic runtimes

if given enough structural constraints.

This has big implications for:

• agent systems
• reproducible reasoning
• safety-critical assessment
• on-device AI runtimes
• deterministic / hybrid agents
• structured execution pipelines
• alternatives to tool-based agent frameworks

LLMs might behave more like components of an operating system

than we previously assumed.

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📌 Final Thoughts

This FRR Runtime is not an aerospace tool.

But it is a working proof that:

• structure → determinism
• determinism → reproducible reasoning
• reproducible reasoning → safer agents

If you’re exploring deterministic AI behavior, structured LLM runtimes,

or alternative agent architectures, this experiment might interest you.

More deterministic runtimes coming soon (medical risk, financial risk, etc.).

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⭐ Want the Soft-System Prompt?

If anyone wants the FRR Runtime soft prompt (safe, stripped-down version)

I’m happy to share it in the comments.