GLM 5.2 Fast is live on Fireworks

Fireworks has launched GLM 5.2 Fast, a serverless deployment designed to enhance the efficiency and cost-effectiveness of coding agents by running 2-3 times faster than its Standard path without reserved GPUs. GLM 5.2 is optimized for agent loops that require reading, writing, and executing long-horizon tasks, facilitated by a 1M-token context window and high adaptive rate limits. The architecture employs a mixture-of-experts MLP stack and sparse MLA attention stack, allowing for parallelism tailored to different workloads, and uses prompt caching to maintain cost-effectiveness. The system supports structured outputs and maintains quality across tool-call validity and JSON-schema adherence, ensuring reliability even with faster generation speeds. Users can access it via a single API, with the option to prioritize reliability through a Priority service tier. Fast offers higher token throughput, and its seamless integration with existing workflows promises to deliver frontier-level quality and speed on a shared serverless infrastructure.

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