GLM-5.3-FlashX-Legal (Reasoning)
by Zhipu AI
GLM-5.3-FlashX-Legal (Reasoning) is a reasoning model from Zhipu AI, released on October 12, 2026. It has a 1M-token context window and can generate up to 131K output tokens. API pricing is $0.37 per 1M input tokens and $1.25 per 1M output tokens. It ranks #57 of 247 models by Intelligence Score with a score of 41.5.
GLM-5.3-FlashX-Legal (GLM-Legal) is Z.ai's legal-domain variant of GLM-5.3-FlashX, the fast serving tier of GLM-5.3-Flash. It adds legal-domain mid-training and reinforcement-learning post-training across tens of thousands of environments modeled on real legal workflows (legal research, contract review, evidence analysis, document drafting), and is designed to run in agent harnesses with legal-data and Word drafting/revision MCP services. It accepts text, image, and video input with text output, has a 1M-token context window and 128K max output, and runs with always-on thinking (reasoning effort low, high, or max). Z.ai reports a 19.2% all-pass rate on Harvey's Legal Agent Benchmark (LAB), 12.5 points above the base model, independently evaluated by Vals. Announced 2026-10-12; Z.ai lists API pricing at $0.37 input, $0.075 cached input, and $1.25 output per million tokens (API access by application for enterprise customers), and the model is also listed on OpenRouter as z-ai/glm-5.3-flashx-legal.
Key specs
| Provider | Zhipu AI |
|---|---|
| Release date | 2026-10-12 |
| License | proprietary |
| Context window | 1M tokens |
| Max output | 131K tokens |
| Input price | $0.37 / 1M tokens |
| Output price | $1.25 / 1M tokens |
| Intelligence Score | 41.5 |
Quick answers
What is the context window of GLM-5.3-FlashX-Legal (Reasoning)?
GLM-5.3-FlashX-Legal (Reasoning) has a context window of 1M tokens, with a maximum output of 131K tokens per response.
How much does GLM-5.3-FlashX-Legal (Reasoning) cost?
GLM-5.3-FlashX-Legal (Reasoning) costs $0.37 per 1M input tokens and $1.25 per 1M output tokens through the API.
Is GLM-5.3-FlashX-Legal (Reasoning) open source?
No. GLM-5.3-FlashX-Legal (Reasoning) is a proprietary model from Zhipu AI (proprietary license).
When was GLM-5.3-FlashX-Legal (Reasoning) released?
Zhipu AI released GLM-5.3-FlashX-Legal (Reasoning) on October 12, 2026.
How does GLM-5.3-FlashX-Legal (Reasoning) compare to Claude Opus 5.5 (Reasoning)?
GLM-5.3-FlashX-Legal (Reasoning) scores 41.5 on the Intelligence Score versus 59.9 for Claude Opus 5.5 (Reasoning), the current #1. Input pricing is $0.37 vs $4 per 1M tokens.
Compare on the AI leaderboard · All AI models
More models from Zhipu AI
- GLM-5.3 (Reasoning) — Zhipu AI
- GLM-5.3-Flash (Reasoning) — Zhipu AI