---
title: "AI Model Rankings: Kimi K3.1 Pro Debuts at P4 (Oct 26)"
description: Claude Opus 5.5 is still the top AI model at 58 on the Artificial Analysis Intelligence Index. Kimi K3.1 Pro debuts at No. 4. See the top 10.
---
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# Best AI Models This Week: Kimi K3.1 Pro Debuts at No. 4
Chris
October 26, 2026
Weekly AI rankings · Wk 44
**A brand-new model just landed one point off the podium.** Moonshot's Kimi K3.1 Pro entered the Artificial Analysis Intelligence Index at P4 with a score of 55, three points behind the leader. Claude Opus 5.5 still holds P1 at 58.
## The short answer
- **No. 1 this week:** Claude Opus 5.5 (Anthropic), 58. Unchanged for a third straight week.
- **Biggest move:** Kimi K3.1 Pro (Moonshot) debuts at No. 4 with 55, 11 points above Kimi K3.
- **Left the top 10:** Meta's Muse Spark 1.3. Artificial Analysis no longer lists it, so this is a delisting, not a score drop.
- **Compared:** Oct 19 and Oct 26, 2026.
## The top 10 this week
Each model appears once, at its best score across reasoning-effort settings, so the top 10 is ten different models.
Top 10 by model · Artificial Analysis Intelligence Index · Oct 26, 2026
| Rank | Model | Lab | Score | vs Oct 19 |
| --- | --- | --- | --- | --- |
| **P1** | Claude Opus 5.5 | Anthropic | **58** | = |
| **P2** | Claude Sonnet 5.5 | Anthropic | **56** | = |
| **P3** | Muse Wonder Full | Meta | **56** | = |
| **P4** | Kimi K3.1 Pro | Moonshot | **55** | New |
| **P5** | Claude Fable 5.1 | Anthropic | **53** | Down 1 |
| **P6** | GPT-6 Astra | OpenAI | **53** | Down 1 |
| **P7** | Gemini 4 Argon | Google | **53** | Down 1 |
| **P8** | Muse Wonder | Meta | **52** | Down 1 |
| **P9** | GPT-6.1 Sol | OpenAI | **52** | Down 1 |
| **P10** | Grok 4.7 | SpaceXAI | **46** | = |
Muse Spark 1.3 (48), last week's No. 9, is no longer listed on the leaderboard. Grok 4.7 holds No. 10 on page order; Xiaomi's MiMo-V2.6-Pro also scores 46.
## What moved
### What is Kimi K3.1 Pro?
Kimi K3.1 Pro is a new reasoning model from Moonshot AI. Artificial Analysis added it on Oct 23 with an Intelligence Index score of 55, which puts it fourth among all models, behind Claude Opus 5.5 (58), Claude Sonnet 5.5 (56) and Meta's Muse Wonder Full (56). That is 11 points above its predecessor, Kimi K3, at 44.
According to [Artificial Analysis's launch write-up](https://artificialanalysis.ai/articles/kimi-k3-1-pro-launch-benchmarks), the biggest gains are in agentic work. K3.1 Pro posts the highest score of any model on Terminal-Bench 4.0, at 67%, up from 13% for Kimi K3. It also ranks third on GDPval-AA, behind only Claude Opus 5.5 and Muse Wonder Full.
### Is Kimi K3.1 Pro open weights?
Not yet. Moonshot has not published the weights, and Artificial Analysis says it expects them soon after launch. Once they are out, K3.1 Pro becomes the highest-scoring open-weights model, and the gap between the best open-weights model and the best proprietary one narrows from 12 points to 3.
### Five models slide one place
Claude Fable 5.1, GPT-6 Astra, Gemini 4 Argon, Muse Wonder and GPT-6.1 Sol each dropped one place. None of their scores changed. They moved only because Kimi K3.1 Pro entered above them.
### Why did Muse Spark 1.3 disappear?
It is no longer listed on the leaderboard. The same happened this week to Kimi K3 and to the earlier DeepSeek V4.1 Flash, which have newer versions in the table. A model leaving the list is not the same as a model getting worse, so we mark these as delisted rather than as drops.
### Further down the table
Two more models entered the top 50: InclusionAI's Ling 3.1 Flash 1019 at 44 (added Oct 22) and MiniMax-M3.1-Flash at 43 (added Oct 19). The changelog lists no score updates for models already on the board.
## What it means for sports video
**Near-top scores are getting cheaper.** On the leaderboard, Kimi K3.1 Pro costs about $2.11 per Intelligence Index task, against $5.98 for Claude Opus 5.5 at max effort and $5.46 for Claude Sonnet 5.5 at max. Moonshot's list price is $2 per million input tokens and $10 per million output tokens, 33% below Kimi K3. For teams processing a high volume of clips, cost per task matters as much as the top score.
**Speed is the trade-off.** Its median output speed on the leaderboard is 51 tokens per second, about half of Claude Opus 5.5 at max (98). Live workflows that need answers in seconds should test both numbers, not just the score.
**Agentic gains count most for automation.** The jump on Terminal-Bench and agentic workflow tests is the part most relevant to automating multi-step jobs, such as tagging, packaging and publishing clips. K3.1 Pro takes text and image input. The Intelligence Index does not measure video understanding, so test any model on your own footage before switching.
## How to read these rankings
All scores are Artificial Analysis's own Intelligence Index results, shown as whole numbers as they appear on the leaderboard. The index measures general intelligence across a mix of evaluations and is not a video-specific benchmark.
## Frequently asked questions
### What is the best AI model right now?
As of Oct 26, 2026, Claude Opus 5.5 from Anthropic ranks first on the Artificial Analysis Intelligence Index, with a score of 58.
### Who makes Kimi K3.1 Pro?
Moonshot AI, the company behind the Kimi models. K3.1 Pro has a 1 million token context window and accepts text and image input.
### Why does the official leaderboard list one model several times?
Artificial Analysis scores each reasoning-effort setting separately, such as max, xhigh and high. We list each model once, at its best setting. That is why Kimi K3.1 Pro is No. 4 here and the fifth row on the official page.
### How often are these rankings updated?
Artificial Analysis adds models as it evaluates them, often within days of release. We publish this comparison every Monday, against the week before.
Source: Artificial Analysis Intelligence Index, best score per model, compared Oct 19 and Oct 26, 2026. Cost per task and output speed from the same leaderboard on Oct 26.
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### Go deeper
- [Artificial Analysis: AI model leaderboard (Intelligence Index)](https://artificialanalysis.ai/leaderboards/models)
- [Artificial Analysis: changelog](https://artificialanalysis.ai/changelog)
- [Artificial Analysis: Kimi K3.1 Pro launch benchmarks (Oct 23, 2026)](https://artificialanalysis.ai/articles/kimi-k3-1-pro-launch-benchmarks)
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## Keep reading
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### [Seattle AI Week 2026: The Best Clips From Each Day](https://useslipstream.ai/blog/seattle-ai-week-day-one-clips-from-trnouts-frontier-of-ai-fireside)
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