LLM Stats vs LMSYS Chatbot Arena in 2026

LLM Stats and LMSYS Chatbot Arena side by side: what each tool does for a developer, what each costs, and what to check before you choose one.

By SupaKeeper · 2026-10-30

SupaKeeper is published by LunarWerx, which makes some of the tools compared here.

LLM Stats ranks AI models by one combined score that includes pricing ^[1], and LMSYS Chatbot Arena lets you compare two models side by side ^[2]. Model Odds ranks each Anthropic and OpenAI model family by its estimated chance of a release within 30 days ^[3].

Option	What its sources say it does	Cost	Account or install
LLM Stats	Ranks AI models by one combined score of benchmarks and pricing ^[1]; sends a weekly digest by email ^[1]	not published	not published
LMSYS Chatbot Arena	Lets you compare 2 models side by side ^[2]; lets you chat with 1 model at a time ^[2]; its leaderboard lists Claude Opus 5.5 (High) first, with 14.33 % ^[4]	not published	not published
Model Odds	Ranks each Anthropic and OpenAI model family by estimated chance of a release within 30 days ^[3]; sends alerts to confirmed emails ^[3]	free, and its API too ^[3]	no account needed ^[3]; a web app that runs in the browser and needs JavaScript ^[3]

The short answer

LLM Stats gives you one comparable ranking of AI models, built from benchmark results and pricing ^[1]. It also sends a weekly digest of models, benchmarks and analysis to your inbox ^[1]. LMSYS Chatbot Arena lets you compare two models side by side ^[2], or chat with one model at a time ^[2]. Model Odds ranks each Anthropic and OpenAI model family by its estimated chance of a release within 30 days ^[3]. If you need a comparison of how models score and price, LLM Stats's sources say it provides that ^[1]. If you want to put two models next to each other, LMSYS Chatbot Arena's sources describe that ^[2]. If your question is about upcoming releases from Anthropic or OpenAI, Model Odds is built for that ^[3].

What LLM Stats, LMSYS Chatbot Arena is built for

LLM Stats says its score combines benchmark tests such as GPQA and SWE-Bench Verified, coding-arena performance and pricing into one comparable ranking ^[1]. It says it pulls pricing from each provider's public price list and cross-checks it against billing samples through the LLM Stats proxy ^[1]. It offers a weekly curated newsletter digest of models, benchmarks and the analysis that matters, sent to your inbox once a week ^[1]. LMSYS Chatbot Arena says you can compare 2 models side by side ^[2]. It says you can chat directly with 1 model at a time ^[2]. Its leaderboard lists Claude Opus 5.5 (High) first, with 14.33 % ^[4].

What Model Odds is built for

Model Odds is made by the team that publishes this site. It ranks every Anthropic and OpenAI model family by its estimated chance of a release within 30 days ^[3]. Anthropic and OpenAI each get their own page listing every past release ^[3]. Each past launch it uses must be confirmed by an official post and an independent timeline, and it is listed with its date ^[3]. It runs three separate estimates side by side and shows the spread between them as its error bar ^[3]. The estimate comes from a statistical model fitted to the gaps between recent launches, and it accounts for how long the current wait has already lasted ^[3]. Signals read from company SDKs and docs, and from third-party model catalogues when two of them agree, can only raise the odds ^[3]. The estimator can replay any past date without using data from after that date ^[3]. You can sign up with a confirmed email to get alerts, and every subscriber gets every company's drops at the same time ^[3]. It also offers a public API that gives odds for each model line, the launch record and service health ^[3].

Pricing and fees

Model Odds is free, and so is its API, with no account needed ^[3]. The facts given for LLM Stats do not state a price for its site or its newsletter, so none is given here ^[1]. LLM Stats says the model prices it reports are pulled from each provider's public price list and cross-checked against billing samples ^[1]. The facts given for LMSYS Chatbot Arena do not state a price for it, so none is given here ^[2]. Neither source describes a trial or a discount for these tools, so none is stated here. If you need the cost of LLM Stats or LMSYS Chatbot Arena, check their own pages.

Setting it up and daily use

Model Odds is a web app that runs in the browser and needs JavaScript ^[3]. It is a website with a public API, so you can open it in a browser or call the API for its data ^[3]. The website and the API share one stored copy of the data, cached for up to five minutes ^[3]. You can sign up with a confirmed email to get alerts ^[3]. For LLM Stats, the facts describe the weekly digest that arrives by email ^[1] but say nothing about installing or setting up the site. For LMSYS Chatbot Arena, the facts describe side-by-side comparison ^[2] and direct chat with one model ^[2] but say nothing about installation. Check each tool's own pages for setup steps and routine use.

Things to check before you choose

Ask what you need the tool to show you. Are you after a ranking of model scores, a side-by-side test of two models, or the chance of a new Anthropic or OpenAI release? Check whether the models you use appear on each site. Check whether each tool charges for its service, since the facts given here do not say. Check how fresh the data is before you rely on it; Model Odds says its data is cached for up to five minutes ^[3]. Check whether you need alerts and how they arrive; Model Odds sends alerts by email to confirmed addresses ^[3].

How to choose

Choose by the need you have. If you need one comparable ranking of models that includes pricing, LLM Stats's sources describe that ^[1]. If you want a weekly email digest of models and benchmarks, LLM Stats offers one ^[1]. If you want to compare two models side by side, LMSYS Chatbot Arena lets you do that ^[2]. If you want to chat with one model at a time, LMSYS Chatbot Arena offers direct chat ^[2]. If your question is about the chance of a new Anthropic or OpenAI model release within 30 days, Model Odds ranks that ^[3]. The tools answer different questions, so match the question to the tool.

Frequently asked questions

Is LLM Stats free to use?

The facts given here do not state a price for LLM Stats, so none is given here ^[1]. It offers a weekly curated newsletter digest of models, benchmarks and analysis, sent to your inbox once a week ^[1]. Its pricing data is pulled from each provider's public price list and cross-checked against billing samples through the LLM Stats proxy ^[1]. Check its own pages for any cost of use.

Does LMSYS Chatbot Arena let you compare two models?

Yes. LMSYS Chatbot Arena lets you compare 2 models side by side ^[2]. It also lets you chat directly with 1 model at a time ^[2]. Its leaderboard lists Claude Opus 5.5 (High) first, with 14.33 % ^[4]. The facts given here do not state a price for it ^[2], so check its own pages for cost.

How does LLM Stats build its ranking?

LLM Stats combines benchmark tests such as GPQA and SWE-Bench Verified, coding-arena performance and pricing into one comparable ranking ^[1]. It pulls pricing from each provider's public price list and cross-checks it against billing samples through the LLM Stats proxy ^[1]. It also sends a weekly curated digest of models, benchmarks and analysis by email ^[1]. Check its own pages for how often the rankings are updated.

Can Model Odds estimate the chance of a new Anthropic or OpenAI model release?

Yes. Model Odds ranks each Anthropic and OpenAI model family by its estimated chance of a release within 30 days ^[3]. It runs three separate estimates side by side and shows the spread between them as its error bar ^[3]. Each past launch it uses must be confirmed by an official post and an independent timeline ^[3]. Signals from company SDKs and docs can only raise the odds ^[3].

Is Model Odds free, and does it need an account?

Model Odds is free, and so is its API, with no account needed ^[3]. It is a web app that runs in the browser and needs JavaScript ^[3]. The website and the API share one stored copy of the data, cached for up to five minutes ^[3]. You can also sign up with a confirmed email to get alerts ^[3].

Model Odds is free, and so is its API, with no account needed. ^[3]

Try Model Odds