Chromium fork named after radioactive element No. 90. Source code and Linux releases. Windows/MacOS/ARM builds served in different repos, links are towards the top of the README.md.
This report presents the forensic synthetic code analysis of Alex313031/thorium, a C++ project with 7,407 GitHub stars. SynthScan v2.0 examined 37,340 lines of code across 226 source files, recording 124 pattern matches distributed across 9 syntactic categories. The overall adjusted score of 4.9 places this repository in the Likely human-written band.
The scanner applied 160+ deterministic lexical heuristics, multi-line block detectors, abstract syntax tree depth profilers, and a cross-file Jaccard similarity matrix to construct a statistically normalised synthetic code estimate. All matches are individually weighted by severity coefficient and contextual multiplier before summation, and the resulting headline score is temporally discounted to account for the repository's development history relative to the commercial emergence of large language model coding tooling (November 2022 onward).
Longitudinal tracking requires multiple scan runs. Once this repository is re-scanned after new commits land, this chart will visualise how the synthetic code signal evolves over time — enabling you to detect whether AI authorship is growing, stabilising, or being actively corrected by human engineers.
Classifies detected patterns by their diagnostic confidence and structural impact. CRITICAL patterns (coefficient 10) represent definitive synthetic signatures — hallucinated imports, explicit LLM attribution metadata — virtually never produced by human authors. HIGH (5) indicates strong structural tells such as cross-file repetition or cross-linguistic idioms. MEDIUM (2) covers recognisable conversational padding and AI-specific vocabulary. LOW (1) captures subtle indicators like tautological comments and generic boilerplate that require density to carry independent signal.
This horizontal bar chart decomposes the repository's raw synthetic code score by top-level directory, allowing you to pinpoint precisely which modules or components carry the highest AI authorship density. Directories with disproportionately high scores relative to their size warrant targeted manual review: concentrated AI signatures often trace back to mass-generated configuration layers, auto-ported test suites, LLM-scaffolded boilerplate classes, or entire subsystems authored under heavy copilot assistance. Use this view to prioritise your human code-review effort.
The scanner identified 124 distinct pattern matches across 9 syntactic categories. Each entry below represents a discrete location in the source code where the engine recorded a statistically significant AI authorship indicator. Expand any category row to inspect the individual file paths, line numbers, code snippets, and the lexical context (CODE, COMMENT, or STRING) in which each match was detected.
Reading the findings table: The Severity column indicates the diagnostic confidence level (CRITICAL / HIGH / MEDIUM / LOW). The Context column identifies whether the match occurred inside executable code, an inline comment, or a string literal — comment-context matches receive a ×1.5 weight because LLMs systematically over-annotate. The ⚡ bolt icon marks clustered matches: three or more patterns within a 10-line window, each receiving an additional ×1.5 density multiplier as dense clusters constitute far stronger evidence of synthetic authorship than isolated hits.
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | setup.sh | 421 | #printf "\n" && | COMMENT |
| LOW | trunk.sh | 81 | COMMENT | |
| LOW | trunk.sh | 101 | #printf "${c4} .,lllllllllllllllllllll,. \n" && | COMMENT |
| LOW | infra/portable/THORIUM-PORTABLE.sh | 1 | #!/bin/bash | COMMENT |
| LOW | infra/portable/C/THORIUM-PORTABLE.sh.x.c | 561 | #include <sys/ptrace.h> | COMMENT |
| LOW | infra/portable/C/THORIUM-PORTABLE.sh.x.c | 841 | #endif /* HARDENING */ | COMMENT |
| LOW | infra/portable/C/THORIUM-SHELL.sh.x.c | 101 | "\366\246\077\004\112\360\214\313\124\246\230\306\051\122\023\056" | COMMENT |
| LOW | infra/portable/C/THORIUM-SHELL.sh.x.c | 281 | /* Seccomp Sandboxing Init */ | COMMENT |
| LOW | infra/portable/C/THORIUM-SHELL.sh.x.c | 561 | #include <sys/types.h> | COMMENT |
| LOW | other/build_ffmpeg.py | 261 | elif target_arch == 'mipsel': # Unsupported beginning in M90 | COMMENT |
| LOW | …_party/widevine/cdm/linux/arm64/widevine_cdm_version.h | 1 | // Copyright (c) 2012 The Chromium Authors. All rights reserved. | COMMENT |
| LOW | arm/third_party/libaom/cmake_update.sh | 1 | #!/bin/bash | COMMENT |
| LOW | arm/third_party/xnnpack/generate_build_gn.py | 1 | # Copyright 2026 The Chromium Authors and Alex313031 | COMMENT |
| LOW | arm/third_party/xnnpack/generate_build_gn.py | 21 | COMMENT | |
| LOW | arm/third_party/xnnpack/generate_build_gn.py | 41 | import platform as pyplatform | COMMENT |
| LOW | pak_src/main.h | 1 | // Small alternative startfile for main() | COMMENT |
| LOW | pak_src/pak_pack.h | 1 | #pragma once | COMMENT |
| LOW | pak_src/pak_defs.h | 1 | #pragma once | COMMENT |
| LOW | src/tools/clang/scripts/build.py | 1121 | # C++-y "Hello World" program only resulted in 14% faster builds.) | COMMENT |
| LOW | src/net/base/load_flags_list.h | 1 | // Copyright 2026 The Chromium Authors and Alex313031 | COMMENT |
| LOW | src/net/base/load_flags_list.h | 21 | // All other caches are used as normal. | COMMENT |
| LOW | src/net/base/load_flags_list.h | 41 | COMMENT | |
| LOW | src/net/base/load_flags_list.h | 61 | // subresource and speculatively pre-connect or pre-resolve when a referring | COMMENT |
| LOW | src/net/base/load_flags_list.h | 81 | COMMENT | |
| LOW | src/net/base/load_flags_list.h | 101 | // This flag must be set on requests that are allowed to reuse cache entries | COMMENT |
| LOW | src/google_apis/default_api_keys.h | 1 | // Copyright 2024 The Chromium Authors | COMMENT |
| LOW | …le_system_access/file_system_access_safe_move_helper.h | 1 | // Copyright 2026 The Chromium Authors and Alex313031 | COMMENT |
| LOW | …ent/browser/renderer_host/pepper/pepper_file_io_host.h | 1 | // Copyright 2026 The Chromium Authors and Alex313031 | COMMENT |
| LOW | src/components/history/core/browser/history_backend.h | 1 | // Copyright 2026 The Chromium Authors and Alex313031 | COMMENT |
| LOW | src/components/history/core/browser/history_backend.h | 21 | #include "base/containers/lru_cache.h" | COMMENT |
| LOW | src/components/history/core/browser/history_backend.h | 141 | virtual void NotifyProfileError(sql::InitStatus init_status, | COMMENT |
| LOW | src/components/history/core/browser/history_backend.h | 201 | COMMENT | |
| LOW | src/components/history/core/browser/history_backend.h | 241 | // the refs owned by the delegate and any pending transaction, so it will | COMMENT |
| LOW | src/components/history/core/browser/history_backend.h | 341 | COMMENT | |
| LOW | src/components/history/core/browser/history_backend.h | 361 | // {1-day, 7-day, 28-day} metrics whose spanning periods all end on that | COMMENT |
| LOW | src/components/history/core/browser/history_backend.h | 581 | COMMENT | |
| LOW | src/components/history/core/browser/history_backend.h | 701 | bool UpdateVisitReferrerOpenerIDs(VisitID visit_id, | COMMENT |
| LOW | src/components/history/core/browser/history_backend.h | 781 | COMMENT | |
| LOW | src/components/history/core/browser/history_backend.h | 861 | // If the caller wants to add this visit to the VisitedLinkDatabase, it needs | COMMENT |
| LOW | src/components/history/core/browser/history_backend.h | 921 | COMMENT | |
| LOW | src/components/history/core/browser/history_backend.h | 941 | // disk and opens a new transaction. This will be called automatically by | COMMENT |
| LOW | src/components/history/core/browser/history_backend.h | 981 | // type(s). If necessary, this method will create a new segment and return its | COMMENT |
| LOW | src/components/history/core/browser/history_backend.h | 1061 | // of foreign visits, the deletion is implemented in multiple small batches to | COMMENT |
| LOW | src/components/history/core/browser/history_backend.h | 1081 | COMMENT | |
| LOW | src/third_party/widevine/cdm/widevine_cdm_version.h | 1 | // Copyright 2026 The Chromium Authors and Alex313031 | COMMENT |
| LOW | …s_data/resources/definitions/prepopulated_engines.json | 1 | // Copyright 2026 The Chromium Authors, Alex313031, and tomByrer | COMMENT |
| LOW | src/chrome/browser/ui/browser.h | 1 | // Copyright 2026 The Chromium Authors and Alex313031 | COMMENT |
| LOW | src/chrome/browser/ui/browser.h | 21 | #include "base/scoped_observation_traits.h" | COMMENT |
| LOW | src/chrome/browser/ui/browser.h | 41 | #include "components/prefs/pref_change_registrar.h" | COMMENT |
| LOW | src/chrome/browser/ui/browser.h | 261 | COMMENT | |
| LOW | src/chrome/browser/ui/browser.h | 301 | std::optional<int64_t> display_id; | COMMENT |
| LOW | src/chrome/browser/ui/browser.h | 321 | #endif | COMMENT |
| LOW | src/chrome/browser/ui/browser.h | 381 | // Crashes if the requested browser creation is not allowed. | COMMENT |
| LOW | src/chrome/browser/ui/browser.h | 461 | LocationBarModel* location_bar_model() { return location_bar_model_.get(); } | COMMENT |
| LOW | src/chrome/browser/ui/browser.h | 561 | COMMENT | |
| LOW | src/chrome/browser/ui/browser.h | 581 | // | COMMENT |
| LOW | src/chrome/browser/ui/browser.h | 601 | // | COMMENT |
| LOW | src/chrome/browser/ui/browser.h | 621 | // have a chance to save their work before the window is closed without | COMMENT |
| LOW | src/chrome/browser/ui/browser.h | 641 | // 2. The Browser window is hidden, and a task is posted that results in | COMMENT |
| LOW | src/chrome/browser/ui/browser.h | 681 | COMMENT | |
| 21 more matches not shown… | ||||
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| HIGH⚡ | win_scripts/tot.py | 54 | "cd v8 && git restore . && git clean -ffd", | CODE |
| HIGH⚡ | win_scripts/tot.py | 55 | "cd third_party/devtools-frontend/src && git restore . && git clean -ffd", | CODE |
| HIGH⚡ | win_scripts/tot.py | 56 | "cd third_party/ffmpeg && git restore . && git clean -ffd", | CODE |
| HIGH⚡ | win_scripts/trunk.py | 65 | "cd v8 && git restore . && git clean -ffd", | CODE |
| HIGH⚡ | win_scripts/trunk.py | 66 | "cd third_party/devtools-frontend/src && git restore . && git clean -ffd", | CODE |
| HIGH⚡ | win_scripts/trunk.py | 67 | "cd third_party/ffmpeg && git restore . && git clean -ffd", | CODE |
| HIGH | other/build_ffmpeg.py | 969 | '--extra-ldflags=-Wl,-flat_namespace -Wl,-undefined,warning', | STRING |
| HIGH | arm/third_party/xnnpack/generate_build_gn.py | 81 | if (is_android && current_cpu == "arm64") { | CODE |
| HIGH | arm/third_party/xnnpack/generate_build_gn.py | 160 | if (!(is_android && use_order_profiling)) { | CODE |
| HIGH | arm/third_party/xnnpack/generate_build_gn.py | 215 | if (!(is_android && use_order_profiling)) { | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| MEDIUM | win_scripts/build_win.py | 3 | # This file is the equivalent of build_win.sh in the parent directory. | COMMENT |
| MEDIUM | infra/portable/make_portable_win.py | 3 | # This file is the equivalent of make_portable_win.py. | COMMENT |
| MEDIUM | arm/third_party/xnnpack/generate_build_gn.py | 524 | # Create a dependency list containing the source_set's for use by the main | STRING |
| MEDIUM | src/chrome/installer/linux/debian/build.sh | 14 | # Create the Debian changelog file needed by dpkg-gencontrol. This just adds a | COMMENT |
| MEDIUM | src/chrome/installer/linux/debian/build.sh | 31 | # Create the Debian control file needed by dpkg-deb. | COMMENT |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | infra/portable/make_portable_win.py | 80 | CODE | |
| LOW | other/build_ffmpeg.py | 126 | CODE | |
| LOW | other/build_ffmpeg.py | 242 | CODE | |
| LOW | other/build_ffmpeg.py | 664 | CODE | |
| LOW | depot_tools/win_toolchain/package_from_installed.py | 122 | CODE | |
| LOW | depot_tools/win_toolchain/package_from_installed.py | 502 | CODE | |
| LOW | src/tools/clang/scripts/build.py | 652 | CODE | |
| LOW | src/tools/pgo/generate_profile.py | 47 | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | other/build_ffmpeg.py | 7 | CODE | |
| LOW | other/build_ffmpeg.py | 11 | CODE | |
| LOW | other/build_ffmpeg.py | 17 | CODE | |
| LOW | other/build_ffmpeg.py | 19 | CODE | |
| LOW | depot_tools/win_toolchain/package_from_installed.py | 38 | CODE | |
| LOW | arm/third_party/xnnpack/generate_build_gn.py | 46 | CODE | |
| LOW | src/tools/clang/scripts/build.py | 27 | CODE | |
| LOW | src/tools/clang/scripts/build.py | 35 | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | arm/third_party/xnnpack/generate_build_gn.py | 313 | def _objectbuild_from_bazel_log(action, platform: _Platform) -> ObjectBuild: | STRING |
| LOW | arm/third_party/xnnpack/generate_build_gn.py | 432 | def _generate_supporting_source_set(ss: SourceSet) -> str: | STRING |
| LOW | arm/third_party/xnnpack/generate_build_gn.py | 446 | def _generate_per_platform_dep_lists( | STRING |
| LOW | arm/third_party/xnnpack/generate_build_gn.py | 483 | def _generate_main_source_set( | STRING |
| LOW | arm/third_party/xnnpack/generate_build_gn.py | 498 | def _generate_build_identifier() -> None: | STRING |
| LOW | src/components/neterror/resources/dino_game/offline.js | 1728 | function createAdjustedCollisionBox(box, adjustment) { | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | win_scripts/clean.py | 35 | except Exception as e: | CODE |
| LOW | win_scripts/clean.py | 46 | except Exception as e: | CODE |
| LOW | infra/Flatpak/com.alex313031.thorium/unlink_profiles.py | 41 | except Exception: | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | other/build_ffmpeg.py | 1022 | # We want to make sure to play everything Android generates and plays. | STRING |
| LOW | src/chrome/common/chrome_constants.h | 29 | // NOTE: if you change the value of kFrameworkName, please don't forget to | COMMENT |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | arm/third_party/libaom/cmake_update.sh | 12 | # Usage: | COMMENT |