BlogGLM-5.3-Flash BAA: Use GLM-5.3-Flash With PHI Under HIPAA on Concentrate
Use GLM-5.3-Flash with patient data under HIPAA on Concentrate.
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BlogBlogUse GLM-5.3-Flash with patient data under HIPAA on Concentrate.
Concentrate.ai
GLM-5.3-Flash can be used with protected health information (PHI), including patient data and medical records, under HIPAA on Concentrate with a signed BAA, a HIPAA-enabled organization, and routing limited to BAA-eligible providers. Today those providers include Fireworks AI, Baseten and Azure Fireworks. BAA use on Concentrate is $499/month, with no per-request fees and no markup on tokens.
PHI can't go to z.ai's own API because z.ai's first-party route (zai/glm-5.3-flash) is not BAA-eligible on Concentrate. A HIPAA organization on Concentrate blocks that route, so GLM-5.3-Flash requests that carry PHI only go to providers marked BAA-eligible.
GLM-5.3-Flash is z.ai's first natively multimodal GLM-5 model: image and PDF input on a 1M-token context at flash pricing. It was released on August 26, 2026. Reasoning is always on (low, high or max), and it supports function calling and implicit prompt caching.
Healthcare teams use it on Concentrate because it reads documents like scanned referrals, intake forms and lab PDFs at a low per-token price, and Concentrate can route it to providers covered by a BAA. Concentrate serves it through 13 providers, 3 of them BAA-eligible. Full specs are on the GLM-5.3-Flash model page.
You need three things:
Under HHS guidance, a cloud or AI service that handles ePHI for you must sign a BAA. You still own your own HIPAA obligations, including access controls, risk analysis and how your application uses model output.
Today, BAA-eligible providers for GLM-5.3-Flash on Concentrate include Fireworks AI, Baseten and Azure Fireworks.
| Provider | Input $/M | Output $/M |
|---|---|---|
| Fireworks AI | $0.15 | $0.50 |
| Baseten | $0.15 | $0.50 |
| Azure Fireworks | $0.19 | $0.63 |
Examples as of November 2026. See Model Fortress for the live list.
Concentrate keeps PHI on BAA-eligible providers by locking routing on a HIPAA organization:
The full set of locked settings is on the HIPAA LLM gateway page.
Is GLM-5.3-Flash HIPAA compliant? HIPAA compliance belongs to the deployment, not the model. GLM-5.3-Flash can be used with PHI on Concentrate when you have a signed BAA, a HIPAA-enabled organization and routing limited to BAA-eligible providers, and you meet your own HIPAA obligations.
Can I get a BAA for GLM-5.3-Flash? Yes, through Concentrate. BAA use is $499/month, with no per-request fees and no markup on tokens.
Which providers serving GLM-5.3-Flash are BAA-eligible? Today they include Fireworks AI, Baseten and Azure Fireworks. We keep adding BAA-eligible providers; see Model Fortress for the live list.
Can I use GLM-5.3-Flash with patient data or medical records? Yes, on a HIPAA-enabled Concentrate organization with a signed BAA, routed only to BAA-eligible providers.
Can I send PHI straight to the z.ai API? No. z.ai's first-party route is not BAA-eligible on Concentrate.
Does Concentrate sign a BAA? Yes. BAA use is $499/month, with no per-request fees and no markup on tokens. Without a BAA there is no subscription fee. Start at concentrate.ai/compliance.
Does one BAA cover other models? Yes. One BAA covers every model on a BAA-eligible provider, including Claude, GPT, Gemini, DeepSeek and other GLM models. See Model Fortress.
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