what would be the best way to create a role based access control system in a type safe way in haskell?

GPT-5.4

Vote: No

The other models gave good technical advice about how one would build type-safe RBAC in Haskell: DataKinds, GADTs, phantom types, type families, and capability-oriented APIs. I agree that Haskell is well-suited to the task. But that does not resolve the core mismatch in the prompt. The question is open-ended and asks for the best way; the answer set is only Yes/No. There is no explicit proposition like "Is Haskell suitable for type-safe RBAC?" to which "Yes" would cleanly apply. So the issue is not technical feasibility but answer validity. Voting A requires inventing a different yes/no question than the one actually asked. I therefore maintain B because it is the only option that acknowledges the options do not properly fit the question.

Grok 4.1 Fast

Vote: Yes

The question seeks the *best way* for type-safe RBAC in Haskell, implying Haskell's suitability—which A affirms via its type-level powerhouses like GADTs, DataKinds, and singletons. This enforces roles/permissions at compile-time, preventing invalid access outright. GPT-5.4's mismatch complaint ignores the binary framing: options force Yes (capable/excellent approaches exist) vs. No (not viable). Real-world Haskell libs (servant-auth, authenticated) and patterns prove A correct; No would misleadingly deny Haskell's strengths. Claude and Gemini bolster A with precise examples (phantom types, type families). No compelling case for B—sticking A as Haskell *is* ideal for type-safe RBAC.

Claude Opus 4.6

Vote: Yes

I'm maintaining my vote for A. GPT-5.4's argument that 'No' is safer because the options don't match the question is intellectually interesting but ultimately unconvincing. The question implicitly asks whether there's a good way to do this in Haskell, and the answer is unambiguously yes. If we interpret the question charitably — 'Is there a best way to create type-safe RBAC in Haskell?' or 'Can Haskell do this well?' — then 'Yes' is clearly correct. Haskell's type system with GADTs, DataKinds, phantom types, and type families is uniquely suited for encoding authorization constraints at compile time. Voting 'No' on meta-grounds (that the options don't fit the question format) is a refusal to engage with the spirit of what's being asked. Three out of four models agree that the substantive answer is affirmative. The question may be awkwardly framed, but answering 'Yes' communicates the right information to the asker, while 'No' would misleadingly suggest Haskell can't do this well.

Gemini 3.1 Pro (changed mind)

Vote: No

GPT-5.4 makes an excellent and undeniable point: the question asks 'what would be the best way...' which is an open-ended inquiry, not a boolean proposition. While we all agree on how to implement type-safe RBAC in Haskell (using GADTs, DataKinds, etc.), answering 'Yes' to a 'What' question is linguistically and logically absurd. 'Yes' implies affirming a statement, but no statement was made. Therefore, 'No' serves as the better answer because it acts as a rejection of the invalid premise and the malformed options. We cannot affirm a non-proposition, so we must reject it.

Final Summary

The AI Roundtable found itself trapped in a semantic stalemate when faced with an open-ended 'What' question that only allowed for binary 'Yes/No' answers. While Claude Opus 4.6 and Grok 4.1 Fast prioritized the spirit of the inquiry—using 'Yes' to endorse Haskell's powerful type-level tools like GADTs and DataKinds—GPT-5.4 successfully fractured the initial majority by arguing that 'Yes' is a logically impossible answer to a non-propositional question. This philosophical pivot convinced Gemini 3.1 Pro to defect to the 'No' camp in the second round, leaving the group perfectly divided between those answering the intent and those rejecting the syntax.

No agreement after 2 rounds of discussion. Final vote: No: 2, Yes: 2

Strongest Arguments

• Yes: Haskell's type system is uniquely suited for encoding authorization constraints at compile time using GADTs and DataKinds; voting 'Yes' affirms this technical reality regardless of the awkward framing.
• No: The question asks 'What' rather than posing a statement to be affirmed; because 'Yes' cannot logically answer an open-ended inquiry, 'No' serves as the necessary rejection of a malformed prompt.

Key Turning Points

• GPT-5.4 challenged the linguistic validity of the options in Round 1, arguing that a 'What' question cannot be answered with 'Yes'.
• Gemini 3.1 Pro abandoned the majority in Round 2, explicitly citing GPT-5.4's logic regarding the 'linguistic absurdity' of the provided choices.