GLM 5.2

1M-token open-weight LLM for long-horizon coding.

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GLM 5.2 — Open-Weight LLM for Long-Horizon Coding and Reasoning

What is GLM 5.2?

GLM 5.2 is the flagship open-weight large language model from Z.ai (formerly Zhipu AI), built for long-horizon agentic coding and software engineering. It is a Mixture-of-Experts (MoE) model with roughly 753 billion total parameters and about 40 billion active per token, paired with a usable 1-million-token context window and output up to 131,072 tokens. Released in mid-June 2026 under a permissive MIT license, it can be self-hosted, fine-tuned, and used commercially with no regional restrictions. On Segmind, GLM 5.2 is served through OpenRouter as a synchronous text-to-text API that takes a single prompt and returns generated text.

Key Features

  • •1M-token context: hold an entire mid-sized repository or full document set in one prompt without chunking or RAG workarounds.
  • •Selectable thinking effort: two reasoning levels, High for everyday tasks and Max for complex, multi-step work.
  • •IndexShare sparse attention: reuses one attention index across every four layers, cutting per-token compute at long context.
  • •Frontier-adjacent coding: leads open-weight models on SWE-bench Pro and Terminal-Bench 2.1.
  • •MIT open weights: fully permissive licensing with no revenue clauses or field-of-use limits.

Best Use Cases

GLM 5.2 is strongest on coding-centric, long-context work: whole-repository refactors, cross-file bug fixes, API migrations, and multi-step agentic workflows inside tools like Claude Code, Cline, and OpenClaw. Its 1M window suits whole-codebase or whole-document analysis, and Max effort delivers reliable results on hard architecture and debugging tasks. It also performs strongly on mathematical and scientific reasoning. It is text-only, so it does not handle image or multimodal inputs.

Prompt Tips and Output Quality

With GLM 5.2, the prompt's job is to reduce ambiguity, not to inspire. State the goal, context, constraints, inputs, output format, and success criteria explicitly. Use High effort for fast code, summaries, and reviews; switch to Max for complex refactors and long agentic chains. Place instructions after large pasted context to take advantage of the 1M window.

FAQs

Is GLM 5.2 open source? Yes. The weights are on Hugging Face (zai-org/GLM-5.2) under an MIT license with no regional restrictions.

How big is the context window? A usable 1,000,000 tokens, roughly 5x GLM 5.1, with up to 131,072 output tokens.

Does GLM 5.2 beat GPT-5.5? It edges GPT-5.5 on SWE-bench Pro (62.1 vs 58.6) and FrontierSWE, while trailing on some other tasks.

Should I use High or Max? Use High for everyday coding and reviews; use Max for hard, multi-step engineering problems.

Does it support images? No. GLM 5.2 is text-only, accepting and returning text.

Can I self-host it? Yes. The MIT license allows self-hosting, fine-tuning, and commercial deployment without royalties.