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Open-Weights Models

AI models whose trained parameters are published for public download, letting anyone run or fine-tune them, unlike closed API-only models.

Current stories

buildConfirmed2 publishers

Musubi's open PolicyLM-1.7B reads a platform's moderation rules at inference time

Musubi released PolicyLM-1.7B under Apache-2.0 to score messages against a written policy in a reported 22 milliseconds on an H100. Teams can rewrite rules without retraining, though every speed and accuracy figure so far comes from Musubi's own tests.

Perspective Coverage

3 publishers
Builder
Builder 38%
Operator
Operator 37%
Investor
Investor 25%

Reality

Evidence45
Adoption10
Hype gap+25
Incentives70
Confidence60
buildOne report1 publisher

Mistral's Vibe keeps its approval classifier on a Mistral model even when GLM 5.3 writes the code

Mistral has added Z.ai's GLM 5.3 to Vibe, its terminal coding agent, and moved the smart-approve classifier onto a fast Mistral model whatever model is active. Teams that pick GLM 5.3 to write code still get a Mistral model deciding when a person must approve an action.

Publishers:dev.to

Reality

Evidence45
Adoption
Not scored
Hype gap+5
Incentives50
Confidence45
buildOne report1 publisher

Cantina's open-weights exploit model ran a 60-task security eval for $2.38

Cantina released apex-flash-1, an open-weights vulnerability-research model it says solved 40 of 60 tasks for $2.38, against $74.68 for Claude Opus 5 High. There is no hosted endpoint, so teams download the 321-billion-parameter weights, pay for their own inference and verify the numbers themselves.

Publishers:runtimewire.com

Reality

Evidence45
Adoption
Not scored
Hype gap+35
Incentives70
Confidence40
buildConfirmed3 publishers

Ai2's open AstaBrief 8B writes cited research reports 3.5 times faster than Asta's Claude mode

Ai2 open-sourced AstaBrief 8B, which writes cited research reports in 51.1 seconds against 178.5 for Asta's Claude-powered mode. Labs that cannot send unpublished research questions to a hosted model can now run a cited-report generator on their own servers.

Perspective Coverage

3 publishers
Builder
Builder 55%
Operator
Operator 33%
Investor
Investor 12%

Reality

Evidence55
Adoption18
Hype gap+22
Incentives55
Confidence60
buildOne report1 publisher

Cantina publishes a security model built from 50 of its own vulnerability cases

Cantina released Apex Flash-1, an open-weights security model fine-tuned on 50 of its own vulnerability cases. Its only performance evidence is a 60-task evaluation the company ran itself, and a separate build is modified to refuse fewer requests.

Publishers:runtimewire.com

Reality

Evidence40
Adoption
Not scored
Hype gap+15
Incentives70
Confidence40
buildConfirmed5 publishers

GLM-5.3 keeps GLM-5.2's base model and claims 50% more on coding: plan for shorter eval cycles

Z.ai says every gain in GLM-5.3 came from post-training on an unchanged base. If that holds, refresh cadence for self-hosted weights is set by RL runs, not pretraining runs.

Perspective Coverage

5 publishers
Builder
Builder 58%
Operator
Operator 33%
Investor
Investor 9%

Reality

Evidence40
Adoption30
Hype gap+35
Incentives70
Confidence55
investOne report1 publisher

Three US providers host Moonshot's Kimi K3 at a tenth the cost of going to the source

Kimi K3's 1.4 terabytes of weights take eight Nvidia GB300s just to sit in memory. Export controls keep those chips away from Moonshot. Modal, Fireworks and Baseten price the hosted result at $3 in and $15 out.

Reality

Evidence32
Adoption45
Hype gap+33
Incentives74
Confidence40
investOne report1 publisher

Who eats the compliance bill: Sacks and Amodei argue thresholds while OpenAI pauses training

The public fight is billed as one about regulatory capture. The operative question is cost incidence, and one lab just showed what an unlegislated security bill looks like.

Publishers:fortune.com

Reality

Evidence36
Adoption24
Hype gap+32
Incentives82
Confidence41
investOne report1 publisher

GLM-5.3 Buys Buyers Time: Z.ai's Coding Model Cuts Tokens, Not the Closed-Model Lead

Z.ai says its 743B-parameter GLM-5.3 hits 34.5% on its own code bench using 22% fewer output tokens than GLM-5.2. The weights are still two weeks out.

Publishers:decrypt.co

Reality

Evidence32
Adoption18
Hype gap+38
Incentives76
Confidence36