# Z.ai: GLM 5.3 Prime

Provider: z-ai  
Category: llm  
Model ID: `z-ai/glm-5.3-prime`

GLM-5.3-Prime is the high-speed variant of Z.ai's GLM-5.3, inheriting its full capabilities while delivering 1.5–2× the output throughput through inference acceleration. It supports text input and output with a 1M-token...

## Specs

- Context length: 1000000 tokens
- Max output: 131072 tokens
- Modalities: text
- Released: 2026-09-23

## Pricing

- Input: $2.80 per million tokens
- Output: $8.80 per million tokens

## Providers

- **z-ai** — ctx 1000000, input $2.80/M, output $8.80/M

## Verdict

GLM 5.3 Prime delivers a million-token context window at $2.80 input per Mtok — roughly half the cost of Claude Sonnet 4.5 for comparable capacity. That makes it compelling for document-heavy workflows where you need to ingest entire codebases or multi-hundred-page reports without chunking. The trade-off: no public benchmarks yet, so you're flying blind on reasoning quality and instruction-following compared to established models. Reach for this when context length and cost matter more than proven performance on standard evals.

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Last verified: 2026-10-19T02:30:34.239Z  
Canonical URL: https://switchy.build/directory/models/glm-5-3-prime