Tools chosen: polymarket_direct claude_news claude_news gdelt_news polymarket_related kalshi_related wikipedia code_execution

Sub-questions (Fermi decomposition)

Planner reasoning

This is a Polymarket question about a specific benchmark threshold, so the market price is the primary anchor and the key empirical facts are (a) the current highest Claude HLE score on the agi.safe.ai leaderboard, (b) the overall SOTA trajectory of HLE scores, and (c) Anthropic's expected 2026 model release cadence. The main uncertainty is the pace of HLE improvement (and whether tool-augmented/search-enabled scores count on the leaderboard), so I want news search plus a math step to extrapolate the improvement curve.

# Current state The market resolves on the OFFICIAL agi.safe.ai (Scale AI/CAIS) Humanity's Last Exam leaderboard. That leaderboard, as of the most recent snapshot (~Aug 2026), shows the best-ranked Claude model (Opus 4.7) at only ~36% (no-tools) — well below 60%. However, Anthropic's own July 2026 Opus 5 launch reports a no-tools HLE score of 56.3% and a with-tools score of 64.7%, figures not yet reflected on the official leaderboard snapshot cited. This creates a live reconciliation gap between self-reported Anthropic numbers and the lagging official leaderboard that will determine resolution. # Timeline of key events - 2025-01: HLE launches; frontier models score single digits (GPT-4o 2.7%, Claude 3.5 Sonnet 4.1%) — confirmed (intuitionlabs.ai). - 2025-11-18: Gemini 3 Pro sets record 37.4% (no-tools), surpassing GPT-5 Pro's 31.64% — confirmed (TechCrunch). - 2025-11 (Opus 4.5 launch): Claude trails Gemini 3 Pro by ~7pts no-tools, ~2pts with search — confirmed (Vellum). - 2026-02: Opus 4.6 system card claims Anthropic "leads all frontier models" on HLE; third-party recompute: 40.0% no-tools (vs GPT-5.2's 50.0%), 53.1% with tools — reported, self-serving framing flagged. - 2026-02-12: Gemini 3 Deep Think sets new SOTA, 48.4% no-tools — confirmed (MarkTechPost). - 2026-05-28/29: Claude Opus 4.8 launched (dynamic workflows) — confirmed (moneycontrol, mashable); benchmark specifics not detailed. - 2026-07-24: Claude Opus 5 launches; Anthropic reports 56.3% no-tools / 64.7% with tools on HLE — reported by Anthropic + independently corroborated (aireleasetracker.com, benchlm.ai). - 2026-08 (aggregator snapshots): Artificial Analysis/pricepertoken list "Claude Fable 5" at 55.5% and Opus 5 at 54.9%; felloai.com cites Fable 5 at 53.3% — conflicting, unverified model-naming caveat (Fable/Mythos not on Anthropic's standard Opus/Sonnet/Haiku scheme per Wikipedia; Wikipedia does confirm a 2026 "Mythos"/"Fable" release exists). - 2026-08 (official Scale/agi.safe.ai snapshot): top Claude entry still listed as Opus 4.7 at ~36.2%, i.e., official leaderboard appears NOT yet updated with Opus 5 — reported, key lag/omission risk. # Event Will any Anthropic Claude model reach ≥60% HLE Accuracy on the official agi.safe.ai leaderboard by Dec 31, 2026? # Outcomes to forecast Yes / No # Kalshi market anchor No Kalshi-direct price returned for this specific ticker; nearest cross-market anchor is Polymarket at 50.5% YES (down 2pts/7d, up 5.5pts/30d), range 17–60.5% over 20 days, ~$19.3K volume — treat as the consensus to beat. # Sub-question answers 1. **Current highest Claude HLE figure on official leaderboard** — ~36.2% (Claude Opus 4.7, no-tools) per Scale/agi.safe.ai Aug 2026 snapshot (claude_news). Self-reported Opus 5 (Jul 2026) claims 56.3% no-tools but not yet visible on the official leaderboard. 2. **SOTA across labs / tools vs no-tools** — Official leaderboard SOTA no-tools ~46–48% (Gemini 3.1 Pro Preview, GPT-5.4 Pro); Gemini 3 Deep Think claimed 48.4%. Leaderboard is primarily no-tools; "with tools" scores exist but are typically self-reported in model cards, not the primary leaderboard column. 3. **Rate of increase / extrapolation** — Naive Fermi/code_execution fit (using data only through Nov 2025) implies Claude ≈19.7–57.2% by Dec 2026 (mean ~34%, P(≥60%)≈10-25%). This is now stale: actual Jul 2026 Opus 5 self-reported score (56.3%) already exceeds that mean, showing real trajectory outpaced the earlier linear/logistic fits. 4. **Leaderboard update lag** — Evidence of a real lag: Opus 5 (Jul 2026) not reflected in Aug 2026 official snapshot showing only Opus 4.7. Omission risk is confirmed and material for year-end resolution timing. 5. **2026 release cadence / targets** — Confirmed cadence: Opus 4.6 (Feb), Opus 4.8 (May), Sonnet 5 (mid-2026), Opus 5 (Jul 24). Wikipedia confirms additional restricted "Mythos" and public "Fable" variants released in 2026. No explicit numeric HLE target stated by Anthropic beyond claiming benchmark leadership. 6. **Parallel markets** — No other Kalshi/Polymarket HLE threshold markets found (0 keyword matches for "HLE"/"Humanity's Last Exam"); only this Polymarket contract exists as a direct comparator. # Key facts (high-confidence, factual) 1. [claude_news/Scale AI] Official leaderboard Aug 2026: top Claude entry (Opus 4.7) ≈36.2%, below Gemini/GPT SOTA (~44-46%). 2. [claude_news/Anthropic] Opus 5 (Jul 24, 2026) self-reported: 56.3% no-tools, 64.7% with tools. 3. [TechCrunch/MarkTechPost] Non-Anthropic SOTA progressed 37.4%→48.4% no-tools between Nov 2025–Feb 2026. 4. [Wikipedia] Anthropic released additional 2026 model tiers "Mythos" (restricted) and "Fable" (public), beyond standard Opus/Sonnet/Haiku naming — corroborates aggregator "Fable 5" mentions. 5. [Polymarket] Current YES 50.5%, range 17–60.5%, trending up over 30d. # Cross-market signals - Kalshi related: no direct HLE market; tangential Anthropic markets (IPO race 92%, sector classification 85%) show no benchmark-relevant signal. - Polymarket: 50.5% YES, coin-flip pricing, recent modest uptrend (+5.5% 30d) consistent with Opus 5's July release news. - Sportsbook implied: N/A. # Analyst opinions and speculation - claude_news synthesis: "if with-tools counts, threshold arguably already cleared; if only no-tools counts, Claude is just under 60% but climbing rapidly." - Digg/commentators flag conflict-of-interest concerns about self-reported benchmark claims (Meta Muse Spark case) — generalizable caution for Anthropic's own Opus 5 figures pending official leaderboard confirmation. - code_execution Fermi model (using pre-Opus5 data) is stale/underestimates given Opus 5's actual reported jump to 56.3%. # Directional lean per outcome - **Yes**: Opus 5 no-tools (56.3%) is very close to threshold; with-tools (64.7%) already exceeds it; steep recent trajectory (40%→56.3% in ~5 months) plus ~5 more months and likely further Opus/Sonnet iterations before Dec 2026 close. - **No**: Official agi.safe.ai leaderboard still shows only ~36%, with confirmed update lag/omission of Opus 5; resolution explicitly keys on "HLE Accuracy" label on official source, likely the no-tools column, and leaderboard methodology updates (grader revisions) have sometimes lowered reported scores; unverified aggregator model names ("Fable 5") add noise/risk of overstatement. # Gaps / unknowns - Whether official leaderboard will list a "with tools" HLE Accuracy figure that could trigger Yes at 64.7%. - Timing/likelihood of agi.safe.ai actually updating with Opus 5 (or later models) before Dec 31, 2026 cutoff. - True status/naming of "Claude Fable 5"/"Mythos" — possibly same models as Opus 5 variants, unclear if independently verified on official leaderboard. # Calibration anchors - Polymarket YES 50.5% (primary cross-market anchor). - Precedent: HLE SOTA has moved from single digits (Jan 2025) to ~48% (Feb 2026) to Anthropic's self-reported 56%+ (Jul 2026) — a fast-moving benchmark where large multi-month jumps are historically plausible.

1. Both forecasters converge near 53-54% with minimal spread, essentially anchoring to Polymarket without independently weighting the strongest structural fact: the official leaderboard has a *confirmed* multi-month update lag (Opus 5 released Jul 24, still absent from Aug snapshot), meaning the resolution source itself may simply never catch up by Dec 31 regardless of true model capability — this argues for a lower Yes than a coin-flip, not a nudge above it. 2. Neither forecast explicitly models the "with-tools" ambiguity as a distinct scenario with its own probability — if agi.safe.ai adds or already has a with-tools column showing 64.7%, that's a near-certain Yes trigger, but if it's no-tools only, Claude sits at 56.3% needing further gains; this bimodal resolution-criteria uncertainty should have been decomposed rather than blended into a single point estimate. 3. Both treat the trajectory (40%→56.3% in ~5 months) as supporting Yes, but this rate is Anthropic's *self-reported* number, not the official leaderboard's independent measurement — the leaderboard's own no-tools SOTA only moved 37.4%→48.4% (Nov 2025–Feb 2026) among all labs, a much slower pace that better predicts what agi.safe.ai will actually display by year-end. 4. Neither forecaster addresses the risk flagged in the brief that "grader/methodology revisions have historically trimmed scores" — official leaderboard re-grading is a documented downside risk that could keep even an updated Opus 5 entry below 60% even if Anthropic's self-report says 56-65%. 5. Both forecasts land within 1 point of each other (53% vs 54%), suggesting insufficient independent reasoning; given the genuine bimodality here (leaderboard-lag-driven No vs. self-reported-score-driven Yes), a wider dispersion or explicit scenario-weighted calculation (e.g., P(leaderboard updates by Dec 31) × P(score ≥60% if updated)) would have been more diagnostic than a simple anchor-and-nudge approach. 6. Neither forecast weighs the "Fable 5"/"Mythos" naming ambiguity as a potential wildcard — if these unverified aggregator entries (53-55%) are actually distinct, more advanced Claude variants that could reach 60%+ before Dec 31 and get officially listed under a different name, this represents an under-explored path to Yes that isn't captured in either rationale.

43% (43% confidence)

Yes: 43% No: 57%

Both forecasters essentially anchored to Polymarket's 50.5% and nudged up, without independently pricing the conjunction required for Yes: the official agi.safe.ai leaderboard must (a) actually update with a Claude entry before Dec 31 and (b) display an accuracy of ≥60%. The strongest documented facts push the other way: the official snapshot still shows only Opus 4.7 at ~36.2% with a confirmed multi-month lag, the primary leaderboard column is no-tools where Anthropic's own best self-report is 56.3% (short of 60%), and third-party recomputes have historically come in below Anthropic's self-serving framing (Opus 4.6: 40.0% recompute vs 'leads all frontier models' claim), with grader revisions an additional downside risk. Paths to Yes remain real — a with-tools column at 64.7%, a post-Opus-5 release (Fable/Mythos variants), and a genuinely fast-moving benchmark — which is why I don't go far below the market. Scenario weighting (roughly 55-65% chance of a timely official Claude update × ~55-65% chance that update reads ≥60%, plus a modest with-tools/wildcard boost) lands just under the coin-flip anchor.

Total pipeline time: 234.9s