LMArena

AI model rankings, arena scores and model votes

Human-vote leaderboards for AI models across text, image, video, search, and web development.

Get leaderboard

Get leaderboard

Get ranked AI models, scores, votes, confidence intervals, organizations, licenses, and the last-updated date for an Arena leaderboard. Covers the overall rankings in seven listed arenas; up to 200 models.

Your information

CategoryOptional

Arena to rank, for example text or webdev. Available: text, webdev, vision, text_to_image, image_edit, search, text_to_video.

Max ResultsOptional

Maximum models to return, for example 25 (up to 200).

1 credit per completed run

The same inputs also work from your code or an AI assistant. See For developers.

Example results

AI model leaderboard

Updated Sep 25, 2026

Rank	Model	Arena score	Confidence interval	Votes	Organization
1	claude-opus-5.5-max	1,827	+18/-18	1,607	Anthropic
2	gpt-6-astra-max	1,792	+11/-11	4,908	OpenAI
3	claude-fable-5.1-max	1,751	+10/-10	5,313	Anthropic
4	claude-opus-5-max	1,693	+7/-7	15,627	Anthropic
5	gpt-6-sol-max	1,681	+15/-15	2,019	OpenAI

About the LMArena tool

LMArena, also called Chatbot Arena, returns ranked models, scores, votes, confidence intervals, organizations, licenses, and update dates.

Get leaderboard takes an arena category and model limit, returning ranked entries for up to 200 models.

Built from arena.ai. Last checked Sep 29, 2026.

Actions

Get leaderboard

1 credit

What you provide

Field	Type	Required	Description
Category`category`	Text	Optional	Arena to rank, for example text or webdev. Available: text, webdev, vision, text_to_image, image_edit, search, text_to_video.Example: Webdev
Max Results`max_results`	Number	Optional	Maximum models to return, for example 25 (up to 200).Example: 5

What you get

Field	Type	Description
Models`models`	List	Models in the order shown on the leaderboard.
Rank`models[].rank`	Number	Rank on the selected leaderboard.Example: 1
Votes`models[].votes`	Number	Number of votes for this model.Example: 1607
License`models[].license`	Text	Displayed model license.Example: Proprietary
Model Name`models[].model_name`	Text	Displayed model name.Example: claude-opus-5.5-max
Arena Score`models[].arena_score`	Number	Displayed Arena score.Example: 1827
Organization`models[].organization`	Text	Organization behind the model.Example: Anthropic
Leaderboard Link`models[].leaderboard_link`	Text	Public page for this leaderboard.Example: https://arena.ai/leaderboard/code/webdev
Confidence Interval`models[].confidence_interval`	Text	Confidence interval exactly as displayed, such as ±12 or +18/-18.Example: +18/-18
Last Updated`last_updated`	Date	Date the selected leaderboard was last updated (YYYY-MM-DD).Example: 2026-09-25

Example result

For Category: Webdev, Max Results: 5

JSON

{
  "models": [
    {
      "rank": 1,
      "votes": 1607,
      "license": "Proprietary",
      "model_name": "claude-opus-5.5-max",
      "arena_score": 1827,
      "organization": "Anthropic",
      "leaderboard_link": "https://arena.ai/leaderboard/code/webdev",
      "confidence_interval": "+18/-18"
    },
    {
      "rank": 2,
      "votes": 4908,
      "license": "Proprietary",
      "model_name": "gpt-6-astra-max",
      "arena_score": 1792,
      "organization": "OpenAI",
      "leaderboard_link": "https://arena.ai/leaderboard/code/webdev",
      "confidence_interval": "+11/-11"
    },
    {
      "rank": 3,
      "votes": 5313,
      "license": "Proprietary",
      "model_name": "claude-fable-5.1-max",
      "arena_score": 1751,
      "organization": "Anthropic",
      "leaderboard_link": "https://arena.ai/leaderboard/code/webdev",
      "confidence_interval": "+10/-10"
    }
  ],
  "last_updated": "2026-09-25"
}

For developers

Call it from your code with one request. Change the values in input to run it on new data. To get an API key, open Developers at the bottom of Studio, turn on Developer mode and go to API keys.

cURL

curl 'https://api.fous.com/v1/query' \
  --fail-with-body --silent --show-error --max-time 180 \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H 'Content-Type: application/json' \
  --data-raw '{
  "api": "@lmarena",
  "visibility": "public",
  "operation": "get_leaderboard",
  "version": 1,
  "input": {
    "category": "webdev",
    "max_results": 5
  },
  "response": {
    "format": "json"
  }
}'

What you can do with it

Compare model rankings across arena categories
Track Arena scores and vote counts
Review model organizations and displayed licenses
Monitor confidence intervals for ranked models
Check when a selected leaderboard was last updated

Questions about LMArena

Can I run it with my own inputs?

Yes. Change the inputs in Studio and press Run, or send new inputs from your code, or ask a connected AI assistant.

Can I call this LMArena tool as an API?

Yes. Send a POST request to /v1/query with your Fous API key and the inputs, and get JSON back.

How much does it cost?

Each completed run costs 1 credit. Failed runs without a completed receipt are free; completed work can remain charged if delivery is interrupted. With pay as you go, a credit costs 1¢. Monthly plans cost less per credit.

Do I need a LMArena account?

No. You only need a Fous account.

How current is the data?

Fous gets the data from arena.ai when you run it. Some results are reused for up to 24 hours, and results that use your account or key are never reused. It was last verified on Sep 29, 2026.