| What it does | Free stealth reasoning model for coding, agentic work, and multimodal workflows available through OpenRouter
| Python framework for building and simulating dynamical systems using block diagrams
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| Stage | Not given
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| Founded | Not given
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| Based in | Not given
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| Pricing model | Free
| Open source
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| Pricing | $0 per million input tokens, $0 per million output tokens during preview; TryOXAlpha hosted chat offers 5 free guest replies, 15 additional replies after account creation, and 100 AI replies for $4.99 one-time purchase
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| Key features | - 1,048,576-token context window
- Multimodal inputs: text, image, and video
- Tool calling and structured outputs
- Configurable reasoning efforts: low, high, and max
- OpenAI-compatible API endpoint
- Supported through OpenRouter model ID stealth/ox-alpha
- 131,072 output tokens maximum
| - 30+ solvers including implicit, explicit, and adaptive integrators
- Zero-crossing detection and scheduled events for hybrid systems
- Hot-swappable blocks and solvers during active simulation
- Hierarchical subsystems for modular component design
- MIMO support with multiple input and output ports
- Browser-based visual editor with PathView
- Domain toolboxes for chemical, battery, vehicle, flight, and RF engineering
- Custom blocks through subclassing the base Block class
- Supports continuous-time, discrete-time, and hybrid systems
- FMI integration to wrap Co-Simulation and Model-Exchange FMUs
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| What makes it different | - 1M token context window for repository-scale coding tasks
- Multimodal support combining code with screenshots and diagrams
- Free preview pricing during stealth release
- Tool calling and structured output for agentic workflows
| - Readable, scriptable alternative to traditional simulation tools with solver depth
- Full ecosystem including FastSim Rust engine and standalone C code generation
- Minimal runtime dependencies: only numpy, scipy, and matplotlib
- Domain-specific toolboxes for chemical, battery, vehicle, flight, and RF engineering
- MIT license with open source development
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| Free plan | Not given
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| Open source | Not given
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| Platforms | Not given
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| Public API | Not given
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | Not checked yet ▼ −1 (down) since last check | 38 ▼ −1 (down) since last check |
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| Trust Flow (Majestic) | 0 | 6 |
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| Citation Flow (Majestic) | 17 | 14 |
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| Referring domains (Majestic) | 11 | 18 |
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Ox Alpha