OPENAI BUILD WEEK 2026

What changed, how Codex helped, and how to verify it.

This page separates Titan’s pre-existing local memory foundation from the Build Week extension using a baseline tag, branch, commit history, architecture evidence, and reproducible test gates.

Baseline · baseline-before-build-weekBranch · build-week-2026Codex + GPT-5.6

BEFORE / AFTER BOUNDARY

Titan existed. The Codex memory loop did not.

The baseline tag preserves the source state before the submission period. Build Week commits implement the context, protocol, verification, review, export, and judge paths.

Before Build Week

  • TypeScript/Fastify application shell
  • Local SQLite memory foundation
  • Obsidian Vault indexing
  • Basic retrieval and graph view
  • Optional BYOK chat providers

Built during Build Week

  • Complete local FTS5 candidate search
  • Explainable ranking and honest retrieval mode
  • Bounded persisted Context Compiler
  • Source states, duplicate grouping, and provenance
  • Canonical public Atlas MCP integration
  • Cited deterministic completion verifier
  • Atomic proposal, explicit review, and portable export
  • Judge Tour, Technical Inspector, and public testing path
  • Atlas Core and deterministic Atlas Expanded fixtures

CODEX COLLABORATION

Titan used its own memory to improve Titan.

GPT-5.6 supplied the coding capability. Titan supplied the bounded project memory, strict rules, methodology, provenance, and verification loop.

TitanCodexTitanHuman

  1. 01

    Titan

    Context

    Titan compiled the current project memory.

  2. 02

    Titan

    Skills

    Visual, CSS, and Mobile methodology was selected.

  3. 03

    Codex

    Implementation

    GPT-5.6 and Codex executed the code changes.

  4. 04

    Titan

    Verification

    Titan checked changed files, tests, constraints, and evidence.

  5. 05

    Titan

    Memory proposals

    Durable outcomes were created as reviewable proposals.

  6. 06

    Human

    Human review

    Nothing was approved or exported automatically.

Honest checkpoint: verifier WARNING · proposals remained proposed until review · human approval required · no automatic approval. Private session content and personal filesystem paths stay excluded.

ARCHITECTURE CHANGES

Codex executes. Titan supplies and verifies project memory.

The Build Week extension stays local-first and reuses Titan Core services rather than duplicating retrieval or persistence in the demo.

Obsidian Markdown
        | preview + local index
SQLite FTS5 -> explainable ranking -> Context Compiler
                                         |
Codex session <- Unavailable public Atlas tools over local STDIO
        | changed files + structured test evidence
Deterministic verification -> atomic proposals
        | explicit human approval
Obsidian Markdown + JSONL + manifest

CURRENT PRODUCT / PUBLIC DEMO / HISTORICAL

Tests and fixture results used by the submission.

Current product status, the bounded public Atlas fixture, and frozen benchmark evidence remain explicitly separated.

Current
UnavailableUnavailable

Current backend suite

Current deterministic backend test gate.

Public demo
UnavailableUnavailable

Public Atlas tests

Canonical Atlas Parcel verification suite.

CurrentPublic demo
UnavailableGlobal tools
UnavailablePublic Atlas tools

Tool catalogs

Distinct global workspace and bounded demo surfaces.

Canonical
Unavailabletokens

Canonical Atlas pack

Frozen benchmark context pack.

Canonical
Unavailable%

Atlas context reduction

Historical documented comparison.

Historical
Unavailable

Deterministic fixture notes

Reproducible Atlas Expanded scale.

Public demo
3outcomes

Deterministic verifier

PASS · WARNING · FAIL

Public demo
Read-only

Original Vault unchanged

The public workflow writes only generated demo state.

Run the verification commands

CHRONOLOGICAL COMMITS

Evidence from baseline to public judge path.

The list is chronological and intentionally excludes private thread content. Hashes identify the implementation boundary in the Build Week branch.

  1. loadingLoading commit evidence…

KNOWN LIMITATIONS

What this submission does not claim.

Scope is part of credibility. The public path demonstrates the complete loop without presenting a synthetic fixture as customer scale or a Windows build as cross-platform certification.

Windows certification

Only Windows 10/11 x64 is claimed for the tested local build.

Synthetic public data

Atlas Core and Atlas Expanded are fictional, reproducible judge fixtures.

Local MCP

The full Codex integration requires a local authenticated Codex session and STDIO process.

No autonomous Vault rewrite

The original Vault remains read-only; physical reorganization is outside this submission.

No semantic model verifier

Verification is deterministic and bounded to persisted context, files, constraints, and supplied tests.

Local judge build

This build exposes the verified product, demo, testing, and Build Week routes without claiming external release destinations.

INSPECT IT

Follow the evidence into the real demo.

Start with the Judge Tour, inspect every source in the Technical Inspector, or reproduce the workflow locally.

Judge TourTechnical InspectorTesting Instructions