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Bolt releases Forge, an AI agent for browser-based app builder using open-weight models
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Bolt has released Forge, a new AI agent within its browser-based app builder that exclusively runs on open-weight models. The default lineup includes GLM 5.3 and GLM 5.3 Flash, with Kimi K3 and DeepSeek v4 Pro available as experimental options. All models are accessible under a single monthly usage bar with no daily limits. On the Bolt Build Index, the company's proprietary benchmark for project completion within the builder, the Forge models scored 92.2, compared with 101.0 for Claude Opus 5, indicating a performance gap against the leading proprietary model.
Source report
Bolt has released Forge, a new agent within its browser-based app builder that operates exclusively on open-weight models.
Default and Experimental Model Options
- Default models: GLM 5.3 and GLM 5.3 Flash
- Experimental models: Kimi K3 and DeepSeek v4 Pro (available under one monthly usage bar with no daily limits)
Performance Benchmark
On the Bolt Build Index — the company's benchmark for measuring how well a model completes projects within the builder — the Forge models scored 92.2, compared to 101.0 for Claude Opus 5.
Source
testingcatalogNeutral / independent
Part of this Story
Bolt Forge launches open-weight AI models, GLM 5.3 Flash dominates 54% of prompts in first 48 hours