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TMB-2026-0006··Rumor → partial delivery
🤝🤝Partially delivered

Le Chaton Fat

Subject: Mistral Large 4

Claim

A teased Mistral model, immediately nicknamed "Le Chaton Fat", spread with a rumored spec sheet: 30T-parameter MoE, 256 experts, "outperforms Fable 5 on every benchmark". It was then "confirmed to launch this summer".

Finding

The CEO clarified the name ("It's actually le gros chaton"). The model shipped on 6 October as Mistral Large 4, "Le Chonk": 1T parameters, 49B active, with open weights scheduled for "the end of October". Delta versus rumor: 29 trillion parameters and one season. Severity is low because the cat was real.

Timeline

  1. 15 Jun 2026
    Rumored spec: 30T MoE, outperforms Fable 5 on every benchmark.@gagarot200 · ♥ 171 ↗
  2. 15 Jun 2026
    "It's actually le gros chaton."@arthurmensch · ♥ 9.3K ↗
  3. 15 Jun 2026
    Calls for the French government to intervene before the FAT takeoff.@heyglif · ♥ 2.4K ↗
  4. 16 Jun 2026
    "Confirmed to launch this summer."@NXT4EU · ♥ 577 ↗
  5. 8 Sept 2026
    Still waiting.@Thom_Wolf · ♥ 176 ↗
  6. 6 Oct 2026
    Mistral Large 4 "Le Chonk" ships: 1T params, 49B active.@MistralAI · ♥ 40.6K ↗
  7. Ongoing
    Open weights: "end of October".

Primary sources

The posts this entry is based on, embedded as published.

gagarot200
ガガロット
@gagarot200
Link to tweet
これはエグいぞ🔥 「Claude Fable 5」を 大幅に超える性能を超える 「AIモデル」がリリース予定 @MistralAI が「Le Chaton Fat」の 正式に確認された‼️ - 30T MoE with 256 experts - 1M context window - multimodal and multilingual - outperforms Fable 5 on every benchmark
これはエグいぞ🔥 「Claude Fable 5」を 大幅に超える性能を超える 「AIモデル」がリリース予定 @MistralAI が「Le Chaton Fat」の 正式に確認された‼️ - 30T MoE with 256 experts - 1M context window - multimodal and multilingual - outperforms Fable 5 on every benchmark https://t.co/fxOvyrOQAd
♥ 171Open on X ↗
arthurmensch
Arthur Mensch
@arthurmensch
Link to tweet
It's actually le gros chaton
♥ 9.3KOpen on X ↗
heyglif
GLIF
@heyglif
Link to tweet
The French Goverment needs to STOP Le Chaton Fat before it's too late. This is the FAT takeoff we've been warned against for years!
♥ 2.4KOpen on X ↗
NXT4EU
NXT EU
@NXT4EU
Link to tweet
Mistral Le Chaton Fat has been confirmed to launch this summer! It will also be open-weight, and be set to "surprise in a few capabilities" Europe might be back. 🇪🇺
Mistral Le Chaton Fat has been confirmed to launch this summer! It will also be open-weight, and be set to "surprise in a few capabilities" Europe might be back. 🇪🇺 https://t.co/4OEed7VRo5
♥ 577Open on X ↗
Thom_Wolf
Thomas Wolf
@Thom_Wolf
Link to tweet
Mistral raising this massive 3B round is a very good news for open-source. Largest equity round by a company open-sourcing models, and which deeply believe in giving its users control/ownership of their models Congrats! We ready for Le Chaton Fat
♥ 176Open on X ↗
MistralAI
Mistral AI
@MistralAI
Link to tweet
Meet Mistral Large 4, aka Le Chonk. • 1T parameters, natively multimodal. 49B active. It is the best open weights model from US or Europe on aggregated benchmarks. • State-of-the-art on critical workloads, including cyber defense, manufacturing and finance and it surpasses
♥ 40.6KOpen on X ↗