Which AI company will have the best coding model on Dec 31, 2026? — Anthropic

- [2026-09-24] Third-party mirror BenchLeader, citing LiveBench directly, shows 1Claude Opus 5.5 (xhigh)89.3% 2Claude Opus 5.5 (max)89.3% 3Claude Fable 5.1 (max)86.4% 4Claude Fable 5 (max)86.0% 5GPT-5.6 Sol (max)83.9% — i.e., Anthropic models occupy the top four positions on LiveBench's coding category as of the latest published release. (https://www.benchleader.com/benchmarks/livebench_coding) - [2026-06-25] The underlying data snapshot both BenchLeader and BenchLM mirror is the official LiveBench release dated 2026-06-25: "Cite as: BenchLeader, "LiveBench Coding leaderboard", https://www.benchleader.com/benchmarks/livebench_coding, data as of 24 Sept 2026." , confirming this is still the freshest published coding-category cut as of late September. (https://www.benchleader.com/benchmarks/livebench_coding) - [2026-06-25] BenchLM's mirror of LiveBench's overall (cross-category) score shows "The published LiveBench snapshot places Claude Fable 5.1 first at 83.4%." — this is the blended overall metric, not the "Coding Average" category the market resolves on, but it also shows Anthropic leading. (https://benchlm.ai/benchmarks/livebench) - [2026-09-22] Anthropic released Claude Opus 5.5, its newest flagship, per Anthropic's own announcement: "Claude Opus 5.5 is our first release since we called for pacing the frontier... Opus 5.5 is a major step up from Opus 5. It's the new leading model." This is the model now sitting atop LiveBench Coding. (https://www.anthropic.com/claude-opus-5-5) - [2026-09-24] Independent aggregator felloai.com states "The best AI for coding is Claude Opus 5.5, which Anthropic shipped on September 22 and which leads every coding harness we track: Artificial Analysis's own Terminal-Bench 4.0 at 59.6% against GPT-6 Astra's 59.1%, LiveBench Coding at 89.3" , corroborating Anthropic's coding lead across multiple benchmarks, not just LiveBench. (https://felloai.com/best-ai-models/) - [2026-09-22] Anthropic confirmed further releases are imminent: "Claude Sonnet 5.5 and Claude Haiku 5.5 are set to follow in the coming weeks, carrying many of the same gains in performance, efficiency, and safety." This suggests Anthropic intends to keep iterating rapidly through Q4 2026. (https://emergent.sh/news/opus-5-5-release-date) - [2026-09-26 approx] Competing labs have also shipped recent coding-relevant models placing just below Anthropic on the same LiveBench coding table: GPT-5.6 Sol (83.9%), GPT-5.2-Codex (83.6%), and GPT-6 Sol (81.8%) from OpenAI, per the same BenchLeader mirror, indicating a competitive but currently Anthropic-led field. (https://www.benchleader.com/benchmarks/livebench_coding) - [2026-08-25] On the related but distinct LiveCodeBench benchmark (not the market's resolution source), a different aggregator reports "the top-scoring model on LiveCodeBench is Gemini 3 Pro Preview at 91.7%, followed by Gemini 3 Flash Preview at 90.8% and DeepSeek V3.2 Speciale at 89.6%" — showing Google/DeepSeek lead a different coding benchmark, which underscores that "best coding model" rankings vary by benchmark, though the Kalshi market specifically references LiveBench.ai's "Coding Average." - [2026-09-26] I could not directly load the live, interactive LiveBench.ai leaderboard (JavaScript-rendered site), so figures rely on third-party daily mirrors (BenchLeader, BenchLM) that explicitly cite LiveBench as their source and carry a same-day "data as of" timestamp. NOT FOUND: I could not access livebench.ai's own rendered leaderboard table directly (it requires JavaScript) to independently verify the exact "Coding Average" figure and date-stamp on the official site; I also could not find a LiveBench data refresh dated after 2026-06-25/09-24 that would reflect any post-Opus-5.5 competitor response (e.g., a new GPT or Gemini coding-tuned release) submitted to LiveBench specifically. BOTTOM LINE: As of late September 2026, every available mirror of LiveBench.ai's Coding category shows Anthropic models (Claude Opus 5.5, Claude Fable 5.1/5) occupying the top spots, with OpenAI's GPT-5.6/GPT-5.2-Codex trailing closely behind; Anthropic's September 22 Opus 5.5 release and imminent Sonnet/Haiku 5.5 follow-ups suggest Anthropic is actively defending this lead heading into Q4 2026, though the gap to OpenAI's best coding variants is narrow (roughly 3-5 points) and could shift with new releases before Dec 31.

- [2025-11] Anthropic released Claude Opus 4.5 and claimed leadership in coding; a social post noted "Opus 4.5 tops the new LiveBench leaderboard, GPT and Gemini Pro follow the" ranking (Threads/Kol Tregaskes), consistent with Anthropic holding LiveBench-coding-style top spots into late 2025. https://www.threads.com/@koltregaskes/post/DTHttRYFJWx/opus-tops-the-new-live-bench-leaderboard-gpt-and-gemini-pro-follow-the - [2026-06-25 release] On the current LiveBench 2026-06-25 snapshot mirrored by BenchLM, Claude Fable 5.1 leads the public snapshot at 83.4%, followed by Claude Opus 5.5 (83.2%) and Claude Fable 5 (83.0%) — Anthropic occupies the top three overall slots. https://benchlm.ai/benchmarks/livebench - [2026-09-24/25] On BenchLeader's LiveBench Coding leaderboard (a dedicated mirror of livebench.ai's Coding Average), Claude Opus 5.5 leads LiveBench Coding on BenchLeader with 89.3%, ahead of Claude Opus 5.5 at 89.3%, across 60 model configurations with a published result , with the next four spots also Anthropic models (Fable 5.1, Fable 5) before OpenAI's GPT-5.6 Sol appears at #5. https://www.benchleader.com/benchmarks/livebench_coding - [2026-09] Independent aggregator felloai.com states Anthropic's September 22 flagship leads Artificial Analysis's Terminal-Bench 4.0 and both of LiveBench's coding boards, at $4 / $20 against GPT-6 Astra's $10 / $50 , indicating Anthropic's lead is currently uncontested on both LiveBench coding categories. https://felloai.com/best-ai-models/ - [2026-09] The same source separately confirms The best AI for coding is Claude Opus 5.5, which Anthropic shipped on September 22 and which leads every coding harness we track: Artificial Analysis's own Terminal-Bench 4.0 at 59.6% against GPT-6 Astra's 59.1%, LiveBench Coding at 89.3 . https://felloai.com/best-ai-models/ - [2026-09] llm-stats.com's composite coding leaderboard (not LiveBench specifically, but a related coding-index cross-check) also puts Anthropic first: As of September 2026, Claude Opus 5.5 by Anthropic leads the coding leaderboard with a coding index score of 51.7, followed by GPT-6 Astra (49.0) and GPT-5.6 Sol (45.5) . https://llm-stats.com/leaderboards/best-ai-for-coding - [2026-09] BenchLM.ai's independent coding composite likewise shows Anthropic on top: Claude Opus 5.5 leads coding on BenchLM's September 2026 rankings with a score of 87.6, ahead of Claude Fable 5.1 (81.3) and GPT-6 Astra (74.6) . https://benchlm.ai/coding - [2026-07-16 background] Not specific to Anthropic, but relevant to the competitive field: Bloomberg reporting cited by felloai.com said Google's next flagship model is months behind schedule and has fallen short of Google's internal goals, with the company still working to improve its capabilities particularly in coding , suggesting Google is not an imminent threat to Anthropic's coding lead. https://felloai.com/best-ai-models/ - [2025 pattern] Rankings across 2025-2026 show a "musical chairs" pattern among Anthropic, OpenAI and Google, e.g., one 2025 comparison noted SWE-Bench Verified... Claude Opus 4.5 72.3% Best-in-class for complex multi-file fixes, GPT-5 69.1% Strong on single-file issues , showing Anthropic models have repeatedly (but not exclusively) topped coding-specific evaluations across the last year. - [2025-11] Anthropic's own launch messaging (via Yahoo Finance) stated Anthropic said Opus 4.5 is its most powerful model yet and claims it's the best in the world for "coding, agents, and computer use." — reflecting the company's strategic focus on maintaining a coding lead as its core differentiator. https://finance.yahoo.com/news/anthropic-launches-claude-opus-45-as-googles-gemini-3-gains-big-backers-191645109.html - [historical caveat] Non-LiveBench coding boards show a more contested picture: on LiveCodeBench (a different, competitive-programming-style benchmark), As of August 25, 2026, Gemini 3 Pro Preview leads the LiveCodeBench leaderboard with a score of 91.7 , indicating that "best coding model" claims vary substantially by benchmark provider even in the same period. NOT FOUND: A complete month-by-month timeline of exactly which company held the #1 LiveBench "Coding Average" spot for every month of 2025-2026 (i.e., a precise tally of "days led" per lab); no official Kalshi/prediction-market odds history specific to this exact question were found. BOTTOM LINE: The reference class shows leadership on LiveBench-style coding benchmarks rotates frequently between Anthropic, OpenAI and (less often) Google every few weeks to months as new flagship models ship, but Anthropic has been the most frequent and current occupant of the #1 "Coding Average" position (holding it as of late September 2026 with Claude Opus 5.5), giving a base rate that favors continued or renewed Anthropic leadership by year-end, albeit with real risk of displacement given OpenAI's and Google's history of leapfrogging within months.

- [2026-09-22] Anthropic's own launch materials for Claude Opus 5.5 state Sonnet 5.5 and Haiku 5.5 will follow "in the coming weeks," and Anthropic product lead Mike Krieger publicly repeated the same commitment on X, signalling a deliberate cadence of follow-on releases through Q4 2026 rather than a one-off flagship drop. (https://windowsforum.com/news/claude-sonnet-5-5-confirmed-for-coming-weeks-specs-unannounced.445821/) - [2026-09-24] Reporting citing "TheWinCentral" indicates claims that Sonnet 5.5 is already in partner testing and could ship "next week or in the first week of October, with September 30 or October 1 named as likely dates" — i.e., Anthropic may add a second, cheaper high-scoring coding entrant to LiveBench before Q4 even begins, widening its lead in raw model count at the top. (https://windowsforum.com/news/claude-sonnet-5-5-confirmed-for-coming-weeks-specs-unannounced.445821/) - [2026-09-24] Aggregator felloai.com's per-model breakdown reports that on Anthropic's own harness "the coding gap is wider still, 66.4% on Terminal-Bench 4.0 against the 57.9% OpenAI reports for Astra," and that independently, Artificial Analysis scored Opus 5.5's Terminal-Bench 4.0 result "at 59.6% against GPT-6 Astra's 59.1%" — showing Anthropic's coding lead is corroborated by both self-reported and independent evaluators, not just LiveBench. (https://felloai.com/best-ai-models/) - [2026-09-22] The same source records that OpenAI's simultaneous countermove, GPT-6 Sol and Luna, was explicitly a price cut rather than a capability jump: "Nothing here moves a crown: Sol and Luna are cheaper, not better," and notes "There is no GPT-6 Terra, and OpenAI has not said whether one is planned" — indicating no imminent OpenAI model is positioned to beat Opus 5.5 on coding benchmarks. (https://felloai.com/best-ai-models/) - [2026-09-21] Competing frontier releases from the same week (SpaceXAI's Grok 4.7, Xiaomi's MiMo-V2.6-Pro) scored well below Anthropic's Opus 5.5 on Artificial Analysis's Intelligence Index (46.3 vs. 57.6), suggesting the rest of the field is not close enough to flip a LiveBench Coding lead of Opus 5.5's current 89.3% margin over #5 (GPT-5.6 Sol at 83.9%, per colleagues' data) with a single release. (https://felloai.com/best-ai-models/) - [2026-05-09] Independent of benchmarks, Anthropic's structural position in coding is reinforced by market data: the Menlo Ventures State of Generative AI report puts Claude's enterprise coding market share at 42–54%, versus roughly 21% for OpenAI, giving Anthropic outsized revenue and feedback-loop incentives to keep defending its coding-specific lead over any other category. (https://www.mindstudio.ai/blog/anthropic-beating-openai-claude-market-dominance-data-points) - [2026-07] A follow-up compilation citing the same Menlo Ventures research states Claude Code's enterprise coding-model share reached "approximately 54%... up from 42% six months earlier," a rising trendline that indicates Anthropic's coding investment (and thus its benchmark R&D priority) is accelerating, not plateauing. (https://claudify.tech/blog/state-of-claude-code-2026) - [2026-09-24] BenchLeader's LiveBench Coding mirror explicitly labels LiveBench's coding task as testing "completing and generating code for recent competitive-programming problems, checked by running tests," and its top five entries are four Anthropic models followed by OpenAI's GPT-5.6 Sol — confirming Anthropic's lead is not a single-model fluke but spans multiple recent Claude releases (Opus 5.5, Fable 5.1, Fable 5). (https://www.benchleader.com/benchmarks/livebench_coding) - [2026-06-25] The official livebench.ai site itself (JavaScript-rendered, confirmed by direct fetch) states it is "Showing LiveBench-2026-06-25 — the latest release," meaning the resolution source has not published a fresh full snapshot since Opus 5.5 or any subsequent competitor model was submitted — a lag that, if it persists to Dec 31, would lock in whatever ranking exists at the next refresh, and current signs point to that refresh (mirrored by BenchLeader) already crowning Anthropic. (https://livebench.ai/) - [2026-09-24] Felloai's competitor-response log shows that when Qwen briefly displaced Claude Opus 5 on Arena's vote-based WebDev board by 3 points on Sep 2, "Qwen3.8-Max-0902 has since slipped to fourth on WebDev, behind GPT-6 Astra, Claude Fable 5.1 and Claude Opus 5" within three weeks — illustrating that non-Anthropic coding leads in this cycle have historically been short-lived rather than durable through year-end. (https://felloai.com/best-ai-models/) BOTTOM LINE: The most likely path to YES is continuation of the status quo: Anthropic's Opus 5.5 (and imminent Sonnet 5.5/Haiku 5.5, possibly landing by late September–early October) already occupies the entire top of LiveBench's Coding Average as mirrored in late September 2026, Anthropic's coding-specific R&D and commercial incentives (54% enterprise coding share) are compounding, and rival labs' most recent moves (OpenAI's GPT-6 Sol/Luna price cuts, Grok 4.7, MiMo-V2.6-Pro) have been priced or scaled below Anthropic's coding scores rather than surpassing them — for YES to fail, a competitor would need to both ship a materially stronger coding model AND have it reflected in a fresh LiveBench snapshot before Dec 31. NOT FOUND: Direct, JavaScript-independent confirmation of livebench.ai's own numeric "Coding Average" table (only third-party same-day mirrors were accessible); any official statement from LiveBench.ai on its next full refresh date/cadence; independent (non-Anthropic, non-aggregator) verification of Claude Opus 5.5's Terminal-Bench/coding scores from a neutral evaluator's own site.

- [2026-09-03] OpenAI's own GPT-6 Astra release table shows Astra edging Anthropic on the specific Terminal-Bench 4.0 coding metric, scoring 57.7% versus Fable 5.1's 55.8% and Opus 5's 52.3%, i.e., a like-for-like coding benchmark where OpenAI's newest model already leads a Claude generation just one release behind Opus 5.5. (https://www.vellum.ai/blog/gpt-6-astra-benchmarks-explained) - [2026-09-03] On the independent Artificial Analysis Coding Agent Index, the same source reports "Meta's Muse Spark 1.3 tops DeepSWE at 75.4%, the FrontierCode rows go to Fable 5, and the Artificial Analysis Coding Agent Index is a three-way tie at the top" — showing that even at the moment of Anthropic's LiveBench lead, third-party coding indices already showed a contested, multi-lab picture rather than clean Anthropic dominance. - [2026-09-03] On FrontierCode 1.1 Extended, Astra's 64.5% trails Fable 5's 64.9%, and on the Main split Fable 5 (53.5%) and Opus 5 (53.4%) edge Astra's 53.3% — margins of roughly half a point, illustrating how thin and reversible the current gaps between labs are on adjacent coding benchmarks. (https://www.vellum.ai/blog/gpt-6-astra-benchmarks-explained) - [2026-09-25] A separate, still-live mirror of "LiveBench," llm-stats.com, shows an entirely different and clearly stale leaderboard topped by o3-mini at 84.6% with no Opus 5.5 or Fable 5.1/GPT-6 Astra listed at all among only 38 tracked models, versus BenchLeader's 60-model, Opus-5.5-led snapshot — demonstrating that "LiveBench.ai ranked by Coding Average" is not a single unambiguous, consistently-mirrored number, creating real resolution-technicality risk for Dec 31. (https://llm-stats.com/benchmarks/livebench) - [2026-09-12] Anthropic CEO Dario Amodei's essay published on September 12, 2026, "We Must Pace the Frontier"—a 3,800-word essay urging the industry to deliberately slow the rate at which it improves model capabilities , signals Anthropic's own strategic intent to throttle its release cadence going into Q4, a self-imposed headwind just as rivals accelerate. - [2026-09] Commentary on that essay notes "So pacing, done for real, means the release cadence slows... these measures could become the trigger for stronger requirements, like a fixed testing window before a new model is used" — if Anthropic actually adopts fixed testing windows before shipping Sonnet/Haiku 5.5 or any Opus 5.6, that directly threatens the "imminent follow-ups" cited in prior reports as evidence Anthropic will keep its lead. - [2026-09] The same essay's fallout included "Within hours, the essay had drawn endorsements from rival executives, dissent from Meta, pushback from European capitals, and—within a week—a federal antitrust lawsuit" , adding legal/regulatory uncertainty around Anthropic's ability to keep shipping at its recent pace through year-end. - [2026-07-21] Google's Gemini 3.5 Pro — the flagship most likely to threaten Anthropic's coding lead — had still "the Gemini Pro model page shows the current flagship as Gemini 3.1 Pro with a '3.5 Pro coming soon' badge... the 3.5 generation is real and partly shipped, but the Pro member of it isn't" as of late July, meaning a full quarter's worth of Gemini flagship coding upside is still un-released and could land before Dec 31 with LiveBench-moving results, similar to how Gemini already leads the separate LiveCodeBench benchmark. - [2026-09-02] Google's Gemini 3.8 Flash, a mid-tier model, already posts large coding gains — "released September 2, 2026, and its third Flash model in six weeks. It scores 90.8% on Terminal-Bench 2.1 (up from 81.6% for 3.7 Flash)" — showing Google is iterating on coding-specific capability roughly every two weeks, a materially faster cadence than Anthropic's stated "pacing" posture. - [2026-09] Independent framing of the frontier race notes "Frontier models leapfrog each other every few weeks. Gemini 3.1 Pro leads today, 3.5 Pro will leapfrog it, GPT and Claude will answer, and round it goes" , underscoring the base-rate mechanism by which any three-month lead (Sept–Dec) is historically fragile. - [2026-09] A Reuters-sourced report indicates "Anthropic is weighing whether to release a new AI model to counter GPT-6 Astra's growing enterprise market share — while also evaluating the new model's safety and how much to invest, balanced against profitability, ahead of a possible IPO" , suggesting Anthropic's coding-model roadmap is being shaped by competitive and IPO pressures, not guaranteed to prioritize pure LiveBench-Coding supremacy. - [2026-09] Even OpenAI's most bullish coding claim was self-qualified: "On the independent Artificial Analysis Intelligence Index, Astra scores 61.2, effectively tied with its predecessor GPT-5.6 Sol and behind Claude Fable 5.1 at 65.7... Astra ties Fable 5.1 on the neutral coding index" — a "tie," not a clear Anthropic blowout, meaning the current lead margin is small enough that a single OpenAI or Google patch release could flip specific leaderboard cells before year-end. NOT FOUND: No official livebench.ai-hosted (not third-party-mirrored) "Coding Average" table could be loaded directly; no confirmed date for Gemini 3.5 Pro's actual release nor for any GPT-6.x "Codex"-branded coding-specific model that OpenAI might submit to LiveBench before Dec 31; no evidence yet of Anthropic actually delaying a shipped model because of its own "pacing" commitments (as of this search, Opus 5.5 shipped on schedule). BOTTOM LINE: While Anthropic currently leads LiveBench Coding, the margins over OpenAI's newest models are narrow on several adjacent coding benchmarks, Google's flagship Gemini 3.5 Pro and any new OpenAI coding-tuned release remain unshipped wildcards for Q4, Anthropic's own "pacing the frontier" commitment creates a self-imposed risk of slower cadence, and inconsistent third-party LiveBench mirrors raise real ambiguity about which snapshot the market will use to resolve on Dec 31.