Skip to main content
OpenAI powers Lucia’s model-assisted reasoning and language refinement. The model layer must remain upgradeable without breaking Lucia’s response contract.

​
Current Runtime

Lucia v0.1.3.6 uses: 
GPT-5.5 default model
OpenAI Responses API
Guest Agent model selection: 
runtime owner: hello-lucia/lucia-guest-agent
environment variable: VV_AI_MODEL
current requested model doctrine: GPT-5.5
The purpose is not novelty. The purpose is: 
better reasoning
better intent handling
future-proof model upgrades
controlled API environment

​
JSON Model Gateway

Lucia’s JSON model gateway has migrated from Chat Completions to the OpenAI Responses API. Current Development truth: 
JSON task path → Responses API
semantic conversational intent assist → live in Focus Ops
GPT-5.5 response refinement → verified context packs with truth/routing guardrails
workspace context awareness → active_context.workspace normalized safely
guest-facing Lucia → identity/linkage state stays deterministic
strict brain quality eval → 178/178 after workspace-context awareness
The gateway is infrastructure. It may improve reasoning and language quality, but it must not change Lucia’s public response contract by accident.

​
Critical Constraint

Model upgrades must not break: 
response contract
truth-state discipline
operator calm
routing correctness
permission-based CTAs
scoped entity routing
reminder truth-state
prior recommendation memory
prior offer context
active_context scoping
workspace context awareness
saved DAW workflow truth-state
guest identity/linkage truth-state
magic-link verification boundary

​
Model Does Not Own

The model must not own: 
system truth
external execution claims
route contract
identity of records
verified completion
workspace truth
guest verification truth
booking-private data access

​
Model Can Improve

The model may improve: 
natural language
tone
reasoning expression
intent sensitivity
operator-facing clarity
multi-turn interpretation
permission-based phrasing
emotional containment
Model output sits above deterministic truth. Guest identity, booking IDs, stay windows, payment state, task status, route/action safety, and save/completion truth remain system-owned. Guest-facing Lucia follows the same rule: identity_state, verification_state, linkage_state, verification email destination, token validity, and booking-private data access remain system-owned. Workspace context follows the same rule. GPT-5.5 may explain the current surface in natural language, but deterministic context owns the current surface, active booking/task/action, saved DAW workflow state, and whether the underlying issue is still unresolved.

​
Current Upgrade Status

The GPT-5.5 and Responses API migration is active in Development for v0.1.3.6. Model upgrades are infrastructure changes only when response contract and product behavior remain stable. v0.1.3.6 has not been promoted to Staging yet.

​
See Also