OpenCode introduced free access to GLM 5.3 Flash, offering a 200 k context window for researchers and developers worldwide. They also released Beam from Reflection AI, a model trained for agentic tasks and coding, with 501B parameters and 23B active parameters.

New model availability

GLM 5.3 Flash is provided without charge and supports a 200 k context size, expanding opportunities for long-context experiments. Beam targets agent workflows and programming assistance with a reported 1 M context capability and an architecture tuned for multi-step interactions.

Technical characteristics

Beam, developed by Reflection AI, lists 501B total parameters and 23B active parameters in its specification, aiming to balance capacity and inference efficiency. The model is positioned for coding and agentic applications, where long context and stepwise reasoning are required.

Access and usage

Both GLM 5.3 Flash and Beam are available through OpenCode for a limited free trial period, enabling hands-on evaluation by users. Access methods include a command-line terminal interface and a desktop client for interactive sessions.

Implications for developers

OpenCode's offering reduces entry barriers for teams needing extended context windows and agent-style models for prototyping and research. The free availability may accelerate testing of long-context prompts and multi-turn coding assistants in real-world scenarios.