AI Recommendation
Should you use GLM-5.3-Flash?
GLM-5.3-Flash is listed for chat workloads and supports a 1.0M context window.
Use it when OpenCode Zen's free tier is enough for evaluation, demos, or light production traffic.
GLM-5.3-Flash Free API on OpenCode Zen
Free API VerifiedNative multimodal GLM model for efficient coding and long-horizon agent tasks
Free APIOpenAI compatibleReasoningTool callingJSON modePDF inputVision
API Details
Copy-ready connection details
Base URL
https://opencode.ai/zen/v1 Model ID
glm-5.3-flash API format OpenAI Chat Completions
Technical Details
GLM-5.3-Flash specifications
Context window 1.0M
Max output 131K
Status Online
Family glm-flash
Released Aug 26, 2026
Last updated Aug 26, 2026
Free listing since Aug 26, 2026
Input text, image, video, pdf
Output text
Capabilities reasoning, tool calling, structured output, file attachments, temperature control
Open weights Yes
External benchmark references
| Benchmark | Score | Metric | Date |
|---|---|---|---|
| Terminal-Bench | 84.3 | pass@1 | Not listed |
| DeepSWE | 63.4 | resolved | Not listed |
| Agents' Last Exam | 26.3 | score | Not listed |
| AutomationBench | 48.8 | pass@1 | Not listed |
Best for
- Chat
Benchmark Overview
Benchmark signals for GLM-5.3-Flash
Intelligence General reasoning and instruction following
41.8/100 Coding Programming and code generation
71.5/100 Agentic Tool use and multi-step tasks
50.9/100 Speed Observed generation speed
66 tok/s Context Maximum listed context window
1.0M Pricing
GLM-5.3-Flash pricing per 1M tokens
Input $0.15 per 1M tokens
Output $0.5 per 1M tokens
Access Available OpenCode Zen
Availability
GLM-5.3-Flash availability by provider
We found 2 provider listings for glm-5-3-flash. Check model ID, quota, pricing, and API format before switching providers.
| Provider | Model listing | Access | Context | API | Limits |
|---|---|---|---|---|---|
| | GLM-5.3-Flash | Free tier | 1.0M | Native | Varies |
| | GLM-5.3-Flash | Free tier | 1.0M | Native | Varies |
Compare
GLM-5.3-Flash alternatives to consider
| Model | Provider | Context | Access |
|---|---|---|---|
| GLM-5.3-Flash | LLM7.io | 1.0M | Free tier |
| big-pickle | OpenCode Zen | N/A | Free tier |
| DeepSeek V4 Flash | OpenCode Zen | 1.0M | Check provider |
| MiMo-V2.5 | OpenCode Zen | 1.0M | Check provider |
| Nemotron 3 Ultra 550B A55B | OpenCode Zen | 1.0M | Check provider |
Typical Use Cases
GLM-5.3-Flash use cases
Chat
GLM-5.3-Flash is tagged for chat in this catalog and works with OpenAI-compatible client libraries.
FAQ
GLM-5.3-Flash free API FAQ
Is GLM-5.3-Flash free to use?
GLM-5.3-Flash is listed with free API access on OpenCode Zen, subject to the provider's quota and account policy.
What is the GLM-5.3-Flash model ID?
The model ID shown in this catalog is glm-5.3-flash.
What context window does GLM-5.3-Flash support?
The listed context window is 1.0M tokens with up to 131K output tokens.
More about GLM-5.3-Flash
Free GLM-5.3-Flash API.
For API keys, setup steps, and provider-level limits, see the OpenCode Zen provider page.