Will Anthropic have the best AI model on LiveBench (Mathematics) at the end of October 2026?

- [2026-09-22] The official LiveBench GitHub repo merged a PR adding Claude Opus 5.5's scores: claude-opus-5-5-max-effort scored 97.08 on math, 89.25 on coding, 92.15 on reasoning, landing at #2 overall on the board , confirming Anthropic's Opus 5.5 posts the (then) highest known LiveBench Mathematics score. Source: https://github.com/LiveBench/new-livebench/pull/56 - [2026-09-29] Market-tracking aggregator felloai.com reports Claude Opus 5.5 sits fourth on LiveBench Reasoning at 96.81, behind Claude Opus 5.5 at 97.08, Claude Fable 5.1 at 97.01 and GPT-6.1 Sol at 96.83 — i.e. as of late September 2026, the top three LiveBench Mathematics scores are all Anthropic models (Opus 5.5, Fable 5.1), with GPT-6.1 Sol close behind in third/fourth place (96.83 vs 96.81, sources conflict slightly on exact ordering of #3/#4). Source: https://felloai.com/best-ai-models/ - [2026-09-29] GPT-6.1 Sol, released September 29, is the value alternative and very nearly a co-leader, scoring third on LiveBench Mathematics at 96.83, at a fifth of GPT-6 Astra's token price , meaning OpenAI's newest model is within roughly 0.2 points of Anthropic's leaders but does not top the category. Source: https://felloai.com/best-ai-models/ - [2026-09-29] A third-party comparison site benchmarking GPT-6.1 Sol against GPT-6 Astra shows both OpenAI models tied on LiveBench Mathematics at 96.8, still trailing Anthropic's Opus 5.5 (97.08) and Fable 5.1 (97.01). Source: https://aiagentstore.ai/ai-models/compare/gpt-6-1-sol-vs-gpt-6-astra - [2026-09-22] Anthropic's Claude Opus 5.5 launched with across-the-board improvements; independent tracker Artificial Analysis separately puts Opus 5.5 at 57.6 on Intelligence Index v4.3.2, second only to Claude Opus 5.5... and ahead of Claude Fable 5.1 (text garbled in source but corroborates Opus 5.5 as Anthropic's current top model). Source: https://felloai.com/best-ai-models/ - [2026-09-28] Anthropic released Claude Sonnet 5.5 on this date as a mid-tier model; it is not reported to lead Mathematics but reinforces Anthropic's rapid release cadence in the run-up to the October 31 deadline. Source: https://felloai.com/best-ai-models/ - [2026-09-03] OpenAI's flagship GPT-6 Astra launched; by late September it scored 96.8 on LiveBench Mathematics (per third-party trackers), same as GPT-6.1 Sol, both below Anthropic's current math leaders. Source: https://aiagentstore.ai/ai-models/compare/gpt-6-1-sol-vs-gpt-6-astra - [2026-10-01] The live LiveBench.ai leaderboard page itself is a JavaScript application that could not be scraped directly for the live Mathematics column figures (requires browser rendering); figures above are drawn from mirrors/trackers citing the official LiveBench GitHub data and the September 22, 2026 model-addition PR. Source: https://livebench.ai/#/?cats=Mathematics - [2026-10-01] A Polymarket-tracking aggregator shows the current market-implied probability leans heavily toward Anthropic (~56-63.5%) retaining the Mathematics crown, with OpenAI a distant second (~22-28%) and Google third (~11-17%), consistent with Anthropic's current scoring lead. (Reported only as context per instructions, not as the forecast itself.) Source: https://polymarkettrader.com/odds/which-company-has-the-best-ai-model-on-livebench-mathematics-end-of-october/ - [2026-09-30] No evidence found of any new frontier math-specialized model release from Google, OpenAI, or others in the final days of September that has already overtaken Anthropic's ~97.0+ LiveBench Mathematics score; Gemini 3.1/3.8 variants are reported to trail Claude and GPT-6 series on math-specific benchmarks. Source: https://felloai.com/best-ai-models/ BOTTOM LINE: As of the most recent confirmed LiveBench data (official GitHub PR dated 2026-09-22, corroborated by trackers through 2026-09-29), Anthropic's Claude Opus 5.5 (97.08) and Claude Fable 5.1 (97.01) hold the top two LiveBench Mathematics scores, narrowly ahead of OpenAI's GPT-6.1 Sol/GPT-6 Astra (~96.8); no competitor has yet overtaken Anthropic, and Anthropic has been releasing new frontier models at a faster cadence heading into the October 31 check date. NOT FOUND: Could not directly render/scrape the live, current LiveBench.ai Mathematics leaderboard table (JS-rendered site) to get the exact October 2026 snapshot scores or confirm whether an updated release occurred in the final days of September/early October; could not find any scheduled new model launches from Google, OpenAI, or Anthropic specifically slated for October 2026 that might change the math leaderboard before the October 31 deadline.

- [2024-06-12] LiveBench launched; at initial release the leading model, Claude 3.5 Sonnet, finished roughly 6 percentage points ahead of the rest , giving Anthropic the first-ever overall (and math-adjacent) lead. https://aiwiki.ai/wiki/livebench - [2024-09-12] Leadership flipped to OpenAI within three months: o1-preview-2024-09-12 performed the best overall, 6% better than all other models, and substantially outperformed all other models in the data analysis, language, and math categories . https://arxiv.org/pdf/2406.19314 - [2025-11-18] Google explicitly contested the math lead with Gemini 3: Gemini 3 Pro scored 95% on AIME 2025 without tools and 100% with code execution, compared to 88% for its predecessor , and the model surpassed Grok-4.1, Claude 4.5, and GPT-5-class systems in categories such as math per independent arena trackers. https://venturebeat.com/ai/google-unveils-gemini-3-claiming-the-lead-in-math-science-multimodal-and - [2026-01-08] LiveBench's own SOTA tracker shows the outright benchmark leader was OpenAI, not Anthropic: SOTA score 80.3, SOTA model GPT-5.4 Thinking xHigh, SOTA date 2026 (2026-01-08 release) , confirming leadership keeps rotating among the three top labs roughly each release cycle. https://aiwiki.ai/wiki/livebench - [2026-01 release] Within that same cycle, category-level results were extremely tight: the headline race at the top is dominated by GPT-5.4 Thinking and Gemini 3.1 Pro, separated by less than half a percentage point, with Claude 4.7 Opus Thinking the closest third . https://aiwiki.ai/wiki/livebench - [2026-06-25 release] A subsequent refresh shows Anthropic regaining overall and near-top math numbers, with third-party mirrors reporting Claude Fable 5 xHigh scoring 90.7 on Math and Claude Opus 5 Thinking Max scoring 88.7 on Math in that cycle's category table. https://failingfast.io/ai-coding-guide/benchmarks/ - [2026-09 snapshot] A different aggregator mirroring the same June 2026 LiveBench release lists Claude Fable 5.1 leading the public snapshot at 83.4%, followed by Claude Opus 5.5 (83.2%) and Claude Fable 5 (83.0%) on the overall score, with gaps to non-Anthropic competitors sometimes under a single point. https://benchlm.ai/benchmarks/livebench - [2026-09-30] Confirming the underlying LiveBench data is still being updated monthly, a benchmark aggregator notes the LiveBench leaderboard was last updated in September 2026 and currently includes 38 evaluated models , consistent with the benchmark's historical ~monthly refresh cadence. https://llm-stats.com/benchmarks/livebench - [2026-06] LiveBench's official methodology confirms the refresh cycle that drives this turnover: We update questions regularly so that the benchmark completely refreshes every 6 months. The most recent version is LiveBench-2026-01-08. This version features a new mathematical task and a new data analysis task — each refresh has historically reshuffled which lab tops individual categories, including Math. https://livebench.github.io/ - [Base-rate pattern] Across the ~2.5-year history of LiveBench, the identity of the Math-category (and overall) leader has changed at essentially every major model-release wave — Anthropic (mid-2024), OpenAI o1/o3 (late 2024–2025), Google Gemini 3 (Nov 2025), OpenAI GPT-5.4 (Jan 2026), and Anthropic Claude Opus/Fable 5.x (mid-to-late 2026) — implying no single company has held an uncontested, durable lead for more than a few months at a stretch. NOT FOUND: A clean, continuous month-by-month table of only the "Mathematics" column (as opposed to overall LiveBench score) leader for every release since inception; official livebench.ai leaderboard page itself is JavaScript-rendered and could not be fetched directly to confirm the exact current (October 2026) Math-column topper and its exact score. BOTTOM LINE: Historically the LiveBench Math-category leader has rotated among Anthropic, OpenAI, and Google roughly every one-to-a-few release cycles (each ~1-2 months), with margins at the top frequently under one point, so the base rate favors no company having a lasting lock on first place — meaning Anthropic's current apparent edge is plausible but historically fragile and could flip again before the October 31 check.

YES means: the LiveBench.ai Mathematics column, when checked on October 31, 2026, shows an Anthropic model (e.g., Claude Opus 5.5, Claude Fable 5.1, or a newer Anthropic release) in first place, so Anthropic is declared the winning company. - [2026-10-01] A direct benchmark comparison snapshot (dated today) confirms Claude Opus 5.5 max scores 97.1 on Mathematics versus Claude Sonnet 5 xhigh at 92.9 , reaffirming Opus 5.5 as Anthropic's own internal math ceiling and showing a wide internal buffer over Anthropic's mid-tier model, not just over rivals. https://aiagentstore.ai/ai-models/compare/claude-opus-5-5-vs-claude-sonnet-5 - [2026-09-30] Google's newly announced flagship, Gemini 4 Argon, published benchmark tables that notably omit any LiveBench Mathematics score and do not claim a math-category win: coverage of Argon's "science and math" showing Argon leads on LABBench 2 (88.8%) with a particularly wide gap over Opus 5.5 (73.1%) and Fable 5.1 (68.6%), and on RiemannBench (76.0%), where it is four points clear of Astra — these are not LiveBench Math, and Google did not contest that specific category. https://officechai.com/ai/gemini-4-argon-benchmarks/ - [2026-09-30] An independent benchmark tracker profiling Gemini 4 Argon lists its category scorecard with Math Weight 5% · 0 benchmarks · "Not measured" , confirming no verified LiveBench-comparable math score has been published for Google's latest model as of launch. https://benchlm.ai/models/gemini-4-argon - [2026-09-22] Anthropic's own technical reporting on Claude Mythos 5/5.1 (a restricted "Mythos-class" tier sitting above Opus) shows on USAMO 2026 - a current-year Olympiad math competition - Mythos scores 97.6%, more than double Opus 4.6's 42.3% , and a benchmark mirror records USAMO 2026 ... Score 97.6% ... Weighted 10% ... Anthropic: Claude Fable 5 and Claude Mythos 5 system card — meaning Anthropic holds an even higher-scoring math model in reserve, which if added to LiveBench would only widen Anthropic's lead. https://allthingsaiofficial.substack.com/p/claude-mythos-the-model-anthropic ; https://benchlm.ai/models/claude-mythos-5 - [2026-10-01] Wikipedia's model-history page confirms Anthropic's rapid high-end release cadence continuing into Q4 2026, noting Mythos 5.1 and Fable 5.1 were released in September 2026 , meaning Anthropic has two distinct "Mythos-class" math-strong lineages (Opus and Fable/Mythos) that could independently occupy the LiveBench Math top spot through October. https://en.wikipedia.org/wiki/Claude_Mythos - [2026-10-01] On SWE-bench Verified (a correlated frontier-capability proxy, not Math itself), a benchmark aggregator shows Claude Opus 5 has the highest reported SWE-bench Verified score at 96%, ahead of Claude Mythos 5 (95.5%) and Claude Fable 5 (95%) — the entire top-3 frontier podium across coding-adjacent reasoning benchmarks is Anthropic, consistent with Anthropic's broader reasoning/math dominance pattern this cycle. https://benchlm.ai/benchmarks/swe-bench-verified - [2026-10-01] A separate model comparison page run on "LiveBench's 25 June 2026 question set" (the same underlying LiveBench release cycle feeding the live site) independently reproduces Mathematics: Claude Opus 5.5 leads by 4.1 points ... Can it solve difficult quantitative problems with checkable answers over Sonnet 5, corroborating via a second, differently-sourced tracker that Opus 5.5's ~97 math score is stable and reproducible outside the official GitHub PR alone. https://aiagentstore.ai/ai-models/compare/claude-opus-5-5-vs-claude-sonnet-5 - [2026-09-29] Google's own disclosed Gemini 4 Argon benchmark table, as summarized by a third tracker, explicitly states It does not lead every test: GPT-6 Astra wins FrontierSWE v2 and Terminal-Bench Science, while Claude Opus 5.5 leads Terminal-Bench 4.0 and PostTrainBench — Google itself, in its selective self-published comparison, concedes category losses to Anthropic rather than claiming a clean sweep that would include math. https://www.cometapi.com/what-is-gemini-4-argon/ BOTTOM LINE: Every fresh data point gathered in the final days of September/October 2026 — including Google's and OpenAI's own newest flagship announcements (Gemini 4 Argon, GPT-6.1 Sol) — fails to show any non-Anthropic model claiming or reproducing a LiveBench Mathematics score at or above Anthropic's ~97-point Opus 5.5/Fable 5.1 scores, and Anthropic additionally holds an even higher-scoring reserve model (Mythos 5.1, 97.6% on USAMO) that could extend its lead further if added to the leaderboard before October 31. NOT FOUND: No evidence that Claude Mythos 5/5.1 has actually been submitted to or scored on the official LiveBench Mathematics column (it appears to be evaluated mainly on USAMO/other benchmarks, not necessarily in the LiveBench harness itself); no official Google or OpenAI statement pre-announcing a LiveBench-Math-specific release before October 31, 2026.

YES means: the real-world outcome where this NO-case dimension argues against is Anthropic (Opus 5.5 or another Anthropic model) being displaced as the LiveBench Mathematics leader by another company's model when the board is checked on 2026-10-31; this report argues for NO (Anthropic retains the crown fails to hold, i.e., some other lab tops the Mathematics column). - [2026-09-30] Google DeepMind launched a brand-new flagship, Gemini 4 Argon, right at the start of the market's final month; independent Artificial Analysis testing already places it in the top tier of frontier models, though still "five points behind Claude Opus 5.5" on its general Intelligence Index, showing Google is actively pushing a new frontier contender into the window before the Oct 31 check. https://emergent.sh/learn/gemini-4-argon-benchmarks - [2026-10-01] Argon has not yet been evaluated on LiveBench's Mathematics category at all — a benchmark aggregator lists Argon's "Math Weight 5% ... Not measured," meaning its math capability relative to Anthropic is still an open question that could resolve either way once LiveBench adds it. https://benchlm.ai/models/gemini-4-argon - [2026-09-30] Google's own math-adjacent benchmark (RiemannBench) shows Argon at only 76.0% vs Claude Opus 5.5's 69.6% and GPT-6 Astra's 72.0% — a result that is close and vendor-reported, underscoring how thin and contested the frontier math gap remains going into October. https://officechai.com/ai/gemini-4-argon-benchmarks/ - [2026-09-29] A six-days-old report notes Google DeepMind is also already in "early days of post-training" on Gemini 4 proper, which Google's own DeepMind head says should ship "much earlier" than year-end, with observers speculating "this could be as early as October" — i.e., a second, possibly stronger Google release could land inside the market window. https://www.infoworld.com/article/4226642/google-plans-gemini-4-release-before-year-end-2.html - [2026-08-23] Google's long-promised Gemini 3.5 Pro has been repeatedly delayed (three missed targets: June, July, August) and may be abandoned in favor of jumping straight to Gemini 4, showing Google's release cadence is volatile and unpredictable — a wildcard that could still surface a stronger math model before Oct 31. https://codersera.com/blog/gemini-3-5-pro-launch-guide-2026/ - [2026-10-01] The market-implied probability for Anthropic itself dropped 8 points in the last 24 hours (to 63.5% per one tracker), with Google's share rising nearly 9 points in the same period — a live signal that traders are actively pricing in rising competitive risk to Anthropic's lead, consistent with the Gemini 4 Argon launch. https://polymarkettrader.com/odds/which-company-has-the-best-ai-model-on-livebench-mathematics-end-of-october/ - [2026-09-22] Colleagues' own figures show the gap between Anthropic's leader (97.08) and OpenAI's GPT-6.1 Sol (96.83) is under 0.3 points — a margin easily closed by a single new release or re-scoring, and far smaller than historical swings seen at past LiveBench refreshes (e.g., the 6-point gaps cited for Claude 3.5 Sonnet in 2024 and o1-preview in Sept 2024). https://github.com/LiveBench/new-livebench/pull/56 - [2026-09-30] LiveBench's official repository shows continuous, non-scheduled commit activity (updated Sep 29, 2026, 23 open pull requests) rather than only twice-yearly refreshes, meaning any of OpenAI, Google, or a third lab can get a new model merged onto the Mathematics column at any point before Oct 31, not just at a fixed release date. https://github.com/orgs/LiveBench/repositories - [2026-09-30] The resolution criteria's own tiebreak rule — ties broken by lower "cost per successful task," then alphabetical order — is a technicality that could hurt Anthropic specifically: Argon's cost-per-task on the Artificial Analysis index is $1.99 versus Claude Opus 5.5's $5.98, roughly three times cheaper, so if any future LiveBench Math score ties or is rounded to parity, Anthropic's higher cost per task would likely cost it the tiebreak. https://emergent.sh/learn/gemini-4-argon-benchmarks - [Base rate, reaffirmed] Colleagues' own research already documents that the Math-category/overall leader has flipped at essentially every release wave over LiveBench's 2.5-year history (Anthropic → OpenAI → Google → OpenAI → Anthropic), with no lab holding the top spot for more than a few months — and Anthropic's current reign began only in June–September 2026, meaning it is already near the historical average "hold time" as of the Oct 31 deadline. BOTTOM LINE: While no competitor has overtaken Anthropic's LiveBench Mathematics score as of Oct 1, the lead is narrow (<0.3 points), Google just launched a new frontier model (Gemini 4 Argon) with a possible full Gemini 4 release rumored for October, LiveBench merges new model scores on a rolling basis (not a fixed schedule), and the market's own tiebreak rule (cost per successful task) structurally disfavors Anthropic's pricier models in a close-score scenario — all of which keep a real, if still a-minority, path open for a NO resolution by Oct 31. NOT FOUND: No confirmed LiveBench Mathematics score for Gemini 4 Argon or any GPT-6.2/o-series model that might launch in October; no official LiveBench release calendar entry between Sept 29 and Oct 31, 2026; no confirmation of Gemini 4 Argon's "cost per successful task" on the LiveBench site itself (only Artificial Analysis Intelligence Index cost-per-task was available).