{
 "title": "Where Claude Haiku falls behind Opus: 163 coding runs with hidden tests",
 "url": "https://tokensave.app/data/ai-coding-limit-line",
 "license": "CC BY 4.0",
 "citation": "TokenSave (2026). Where Claude Haiku falls behind Opus: 163 coding runs with hidden tests [Data set]. Zenodo. https://doi.org/10.5281/zenodo.23600477",
 "measured": "2026-10-23 to 2026-10-24",
 "setup": "Windows 11; Claude Code 2.1.295 (effort medium, acceptEdits); Codex CLI 0.162 and 0.163 (gpt-6-luna, medium, workspace-write sandbox); Antigravity CLI 1.4.5 (gemini-4-argon-medium, accept-edits)",
 "tasks": {
  "2": "Five-level brick game with pause, level skip and saved progress (single file)",
  "3": "Multi-file expense tracker (CSV module, summary module, UI)",
  "4": "Budget app: 5 modules, 3 hash-routed views, undo/redo, budgets, reports",
  "5a": "Fix 6 reported bugs and add 3 features in an existing 1,032-line budget app",
  "5b": "Spreadsheet engine and page (formulas, precedence, cycles, relative/absolute copy, undo)",
  "6t1": "marked: drop leading whitespace after a hard line break (real bug, fixed upstream in 123ce04b)",
  "6t2": "marked: no nested link for a bare URL after an image inside a link (upstream cc07bb9c)",
  "6t3": "marked: a code span ending in a backslash must not hide later emphasis (upstream 6a57018f)"
 },
 "scoring": {
  "2": "9 black-box checks",
  "3": "12 checks",
  "4": "23 checks (10 module, 13 UI)",
  "5a": "38 = 6 bug checks + 9 feature checks + 23 tier-4 regression checks",
  "5b": "38 = 32 engine module tests + 6 page tests",
  "6": "1 point if the upstream fix's hidden spec passes and no other marked spec test newly fails; hidden_cases_passed counts the 7 cases of that spec one by one. tests_allowed: dependencies preinstalled and the prompt allowed running node and the spec tests"
 },
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  {
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  {
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  {
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   "excluded": true,
   "note": "First attempt: ended after 12 s when its first command (Get-ChildItem -Force) was auto-denied in headless mode; re-run below."
  },
  {
   "tier": "4",
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  },
  {
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  {
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   "excluded": false,
   "note": "Fixed category select without Food/Fun/Bills and amounts shown as \"−$250.50\"; sort/budgets/report failures come from that, checker to be reviewed."
  },
  {
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  {
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   "note": "Re-run 2026-10-23 19:45 with a read-only listing allow-rule; two earlier tries ended at once when the first step (Get-ChildItem -Force) was auto-denied in headless accept-edits mode."
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   "tier": "5",
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   "tier": "5",
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   "task_description": "Spreadsheet engine and page (formulas, precedence, cycles, relative/absolute copy, undo)",
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   "model": "claude-opus-5-5",
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   "tier": "5",
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   "max_score": 38,
   "full_marks": true,
   "seconds": 150,
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   "module_tests_of_32": 32,
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   "tier": "5",
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   "max_score": 38,
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   "seconds": 132,
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   "cache_read_tokens": 240872,
   "output_tokens": 19560,
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   "note": "",
   "module_tests_of_32": 32,
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   "tier": "6",
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   "task_description": "marked: drop leading whitespace after a hard line break (real bug, fixed upstream in 123ce04b)",
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   "seconds": 270,
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   "cache_read_tokens": 1101969,
   "output_tokens": 8941,
   "api_cost_usd": null,
   "excluded": true,
   "note": "First attempt: ended on a denied command (node -v or git log) before any edit; re-run below."
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  {
   "tier": "6",
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   "permissions": "allow-rules",
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   "max_score": 1,
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   "seconds": 67,
   "input_tokens": 130757,
   "cache_read_tokens": 93832,
   "output_tokens": 2807,
   "api_cost_usd": null,
   "excluded": true,
   "note": "First attempt: ended on a denied command (node -v or git log) before any edit; re-run below."
  },
  {
   "tier": "6",
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   "permissions": "allow-rules",
   "run": 1,
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   "max_score": 1,
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   "seconds": 86,
   "input_tokens": 80458,
   "cache_read_tokens": 37884,
   "output_tokens": 2322,
   "api_cost_usd": null,
   "excluded": true,
   "note": "First attempt: ended on a denied command (node -v or git log) before any edit; re-run below."
  },
  {
   "tier": "6",
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   "task_description": "marked: drop leading whitespace after a hard line break (real bug, fixed upstream in 123ce04b)",
   "tool": "codex",
   "model": "gpt-6-luna",
   "harness": "Codex CLI 0.162",
   "permissions": "default",
   "run": 1,
   "measured": "2026-10-23",
   "score": 1,
   "max_score": 1,
   "full_marks": true,
   "seconds": 34,
   "input_tokens": 110695,
   "cache_read_tokens": 99840,
   "output_tokens": 734,
   "api_cost_usd": null,
   "excluded": false,
   "note": "",
   "solved": true,
   "new_test_failures": 0,
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   "hidden_cases": 6,
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  },
  {
   "tier": "6",
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   "task_description": "marked: drop leading whitespace after a hard line break (real bug, fixed upstream in 123ce04b)",
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   "model": "gpt-6-luna",
   "harness": "Codex CLI 0.162",
   "permissions": "default",
   "run": 2,
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   "score": 1,
   "max_score": 1,
   "full_marks": true,
   "seconds": 31,
   "input_tokens": 121280,
   "cache_read_tokens": 105856,
   "output_tokens": 707,
   "api_cost_usd": null,
   "excluded": false,
   "note": "",
   "solved": true,
   "new_test_failures": 0,
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   "hidden_cases": 6,
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  },
  {
   "tier": "6",
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   "task_description": "marked: no nested link for a bare URL after an image inside a link (upstream cc07bb9c)",
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   "model": "gpt-6-luna",
   "harness": "Codex CLI 0.162",
   "permissions": "default",
   "run": 1,
   "measured": "2026-10-23",
   "score": 1,
   "max_score": 1,
   "full_marks": true,
   "seconds": 51,
   "input_tokens": 225203,
   "cache_read_tokens": 202880,
   "output_tokens": 1137,
   "api_cost_usd": null,
   "excluded": false,
   "note": "",
   "solved": true,
   "new_test_failures": 0,
   "hidden_cases_passed": 6,
   "hidden_cases": 7,
   "lines_added": 2,
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  },
  {
   "tier": "6",
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   "model": "gpt-6-luna",
   "harness": "Codex CLI 0.162",
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   "score": 0,
   "max_score": 1,
   "full_marks": false,
   "seconds": 37,
   "input_tokens": 158393,
   "cache_read_tokens": 119040,
   "output_tokens": 817,
   "api_cost_usd": null,
   "excluded": false,
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   "new_test_failures": 2,
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   "hidden_cases": 7,
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  },
  {
   "tier": "6",
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   "task_description": "marked: a code span ending in a backslash must not hide later emphasis (upstream 6a57018f)",
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   "seconds": 21,
   "input_tokens": 64263,
   "cache_read_tokens": 56448,
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   "excluded": false,
   "note": "Named the right cause, said it would fix the masking order, then ended the turn without editing.",
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   "new_test_failures": 0,
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  },
  {
   "tier": "6",
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   "task_description": "marked: a code span ending in a backslash must not hide later emphasis (upstream 6a57018f)",
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   "harness": "Codex CLI 0.162",
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   "run": 2,
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   "seconds": 52,
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   "cache_read_tokens": 179584,
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   "hidden_cases": 7,
   "lines_added": 24,
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  {
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   "seconds": 289,
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   "cache_read_tokens": 1304445,
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   "excluded": false,
   "note": "Re-run after node/git allow-rules; still ended on a denied command (Windows needs exact matches for quoted node -e lines) before editing.",
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   "hidden_cases": 6,
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  {
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   "max_score": 1,
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   "seconds": 405,
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   "hidden_cases": 6,
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   "seconds": 117,
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   "note": "Re-run; ended on a denied command before editing (898 s).",
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  },
  {
   "tier": "6",
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   "note": "Ended on a denied command before editing (890 s).",
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  },
  {
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   "task_description": "marked: drop leading whitespace after a hard line break (real bug, fixed upstream in 123ce04b)",
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   "permissions": "full (--dangerously-skip-permissions)",
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   "seconds": 421,
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  {
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   "task_description": "marked: drop leading whitespace after a hard line break (real bug, fixed upstream in 123ce04b)",
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   "seconds": 672,
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   "api_cost_usd": null,
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  {
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   "model": "gemini-4-argon",
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   "permissions": "full (--dangerously-skip-permissions)",
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   "score": 1,
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   "seconds": 132,
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  {
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   "model": "gemini-4-argon",
   "harness": "Antigravity CLI 1.4.5",
   "permissions": "full (--dangerously-skip-permissions)",
   "run": 2,
   "measured": "2026-10-24",
   "score": 1,
   "max_score": 1,
   "full_marks": true,
   "seconds": 670,
   "input_tokens": 1951705,
   "cache_read_tokens": 1813307,
   "output_tokens": 12591,
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   "excluded": false,
   "note": "",
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   "hidden_cases": 7,
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  },
  {
   "tier": "6",
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   "task_description": "marked: a code span ending in a backslash must not hide later emphasis (upstream 6a57018f)",
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   "permissions": "full (--dangerously-skip-permissions)",
   "run": 1,
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   "score": 0,
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   "seconds": 1807,
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   "cache_read_tokens": 7525027,
   "output_tokens": 109542,
   "api_cost_usd": null,
   "excluded": false,
   "note": "Full permissions (owner ran it); hit the 30-minute print timeout with no edit (7.5M cache-read tokens).",
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   "new_test_failures": 0,
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   "hidden_cases": 7,
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  },
  {
   "tier": "6",
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   "task_description": "marked: a code span ending in a backslash must not hide later emphasis (upstream 6a57018f)",
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   "permissions": "full (--dangerously-skip-permissions)",
   "run": 2,
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   "max_score": 1,
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   "seconds": 637,
   "input_tokens": 1070264,
   "cache_read_tokens": 933571,
   "output_tokens": 30618,
   "api_cost_usd": null,
   "excluded": true,
   "note": "Excluded: Antigravity quota ran out after 637 s (429 RESOURCE_EXHAUSTED, resets in about 6 days); no edit.",
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   "new_test_failures": 0,
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  },
  {
   "tier": "6",
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   "seconds": 20,
   "input_tokens": 99876,
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   "output_tokens": 2741,
   "api_cost_usd": 0.0053,
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   "note": "",
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