The AI Museum
AI Analytics1,072 recordsRecounted 23 September 2026

Closed-weight language models in 2026

Weightsopenclosedunknownfrontier only
Year20262025202420232022202120202019201820172016
3 filters active, showing 30 of 1,072 recordsClear all

30

Models

14 organisations

0%

Open weights

0 open, 30 closed

0

Frontier

By Epoch's flag

2.4T

Largest traceable

Qwen 3.8 Max

2026

Span

5 with a traceable size

Releases

by month
Jan
Feb
Mar
Apr
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Jun
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Organisation

Country

Domain

Records

30
Closed-weight language models in 2026, newest first. Each row links to the source Epoch AI records for it.
ModelOrganisationReleasedParametersWeights
Claude Fable 5.1Anthropic2026-09—Closed
Gemini 3.8 FlashGoogle DeepMind2026-09—Closed
Grok 4.7xAI2026-092B *Closed
Muse Spark 1.3Meta AI2026-09—Closed
OpenEvidence DarwinOpenEvidence2026-09—Closed
Step 5 PreviewStepFun2026-09600B *Closed
GLM-5.3Z.ai (Zhipu AI)2026-08744BClosed
Muse Spark 1.2Meta AI2026-08—Closed
Claude Opus 5Anthropic2026-07—Closed
Qwen 3.8 MaxAlibaba2026-072.4TClosed
Claude Fable 5Anthropic2026-06—Closed
Claude Mythos 5Anthropic2026-06—Closed
MAI-Code-1-FlashMicrosoft2026-06—Closed
Qwen3.7-PlusAlibaba2026-06—Closed
Claude Opus 4.8Anthropic2026-05—Closed
Composer 2.5Cursor2026-051.0T *Closed
Gemini 3.5 FlashGoogle DeepMind2026-05—Closed
TML-Interaction-SmallThinking Machines2026-05276BClosed
Claude Opus 4.7Anthropic2026-04—Closed
Qwen 3.6 PlusAlibaba2026-04—Closed
Composer 2Cursor2026-031.0TClosed
Gemini 3.0 Flash-liteGoogle DeepMind2026-03—Closed
MiMo-V2-ProXiaomi Corp2026-031.0TClosed
Qwen3.5-Omni-FlashAlibaba2026-03—Closed
Qwen3.5-Omni-PlusAlibaba2026-03—Closed
SWE 1.6Cognition2026-03—Closed
GPT-5.3 CodexOpenAI2026-02—Closed
GPT-5.3-Codex-SparkOpenAI2026-02—Closed
Grok 4.20xAI2026-02500B *Closed
Qwen3-Max-ThinkingAlibaba2026-01—Closed

An asterisk marks a parameter figure the source does not consider traceable to the people who built the model. That judgement is the source’s and it has false negatives: Kimi K3 is marked speculative at 2.8T while Moonshot’s own model card states the figure. Why that distinction carries the whole exhibit.

Counts are of models Epoch AI records as notable, not of every model released. The most recent month is always incomplete, because a model enters the dataset when it is reviewed rather than when it ships.

Epoch AI, 'Data on AI Models'. Published online at epoch.ai. Retrieved from 'https://epoch.ai/data/ai-models-documentation' Used under CC BY 4.0.

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