WHY WE PICKED IT
The Terminal-Bench 3.0 score moved from 4.6% to 28.3%, DeepSWE v1.1 from 46.2% to 66.9%, and CyberGym from 77.2% to 84.5% — all on the same base as GLM-5.2. That is a real signal about post-training returns, even if most numbers are vendor-run and weights are not yet released. It is also reported as one of the fastest models in its class, at roughly 115 tokens per second.
GETTING STARTED
Call GLM-5.3 through the Z.ai API or the chat interface at chat.z.ai. Set `thinking.type` to `enabled` and use `reasoning_effort` of `low`, `high` or `max` (default). For the 1M coding-plan route, use the `glm-5.3[1m]` suffix. Check the Z.ai pricing page for current rates before running large workloads.
QUICK TIPS
1
Change `thinking.type: disabled` to `enabled` with `reasoning_effort: low` before switching model IDs
2
Benchmark with the same agent harness and time budget as Kimi K3 and Qwen3.8-Max
3
Use `max` effort for long-horizon coding, `low` for latency-sensitive paths
4
Wait for the open-weight release before planning self-hosted deployment
5
Confirm the standard API price, not the GLM-5.2 price, before budgeting
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FREQUENTLY ASKED QUESTIONS
Q
Is GLM 5.3 free?
A
No, GLM 5.3 requires a paid subscription.
Q
Does GLM 5.3 have an API?
A
Yes, GLM 5.3 offers an API for programmatic integration.
Q
What is GLM 5.3 best for?
A
GLM 5.3 is best for Post-Training Gains. GLM-5. The Terminal-Bench 3.0 score moved from 4.6% to 28.3%, DeepSWE v1.1 from 46.2% to 66.9%, and CyberGym from 77.2% to 84.5% — all on the same base as GLM-5.2. That is a real signal about post-training returns, even if most numbers are vendor-run and weights are not yet released. It is also reported as one of the fastest models in its class, at roughly 115 tokens per second.
Q
What platforms does GLM 5.3 support?
A
GLM 5.3 supports web, api.
Q
Is GLM 5.3 open source?
A
No, GLM 5.3 is not open source.
Q
How do I get started with GLM 5.3?
A
Call GLM-5.3 through the Z.ai API or the chat interface at chat.z.ai. Set `thinking.type` to `enabled` and use `reasoning_effort` of `low`, `high` or `max` (default). For the 1M coding-plan route, use the `glm-5.3[1m]` suffix. Check the Z.ai pricing page for current rates before running large worklo...
Q
How do I use GLM 5.3?
A
GLM 5.3 is a large language model for text generation, analysis, and conversation. Access through the web interface. Enter prompts or questions to get responses. It excels at terminal-bench 3.0 jumped from 4.6% to 28.3% on the same base.
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