LLM Comparison
GLM-5.3-Flash vs Step 3.5 Flash
Side-by-side specs, pricing & capabilities · Updated September 2026
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2/6 modelsSame tier:
| Organization | ||
| OpenTools Score | 75 463 | |
| Family | GLM | Step |
| Status | Current | Current |
| Release Date | Aug 2026 | Jan 2026 |
| Context Window | 1.3M tokens | 262K tokens |
| Input Price | $0.07/M tokens | $0.10/M tokens |
| Output Price | $0.25/M tokens | $0.30/M tokens |
| Pricing Notes | OpenRouter lists a limited-time discounted price of $0.075/M input and $0.25/M output. Standard first-party style pricing is commonly $0.15/M input and $0.50/M output; cache-read pricing may vary by provider. | — |
| Capabilities | textvisionvideo-inputcodetool-usereasoninglong-contextopen-weights | textcode |
| Training Cutoff | Not disclosed | — |
| Max Output | 131K tokens | 66K tokens |
| API Identifier | z-ai/glm-5.3-flash | stepfun/step-3.5-flash |
| Benchmarks | ||
| Artificial Analysis Intelligence Index v4.1.1 | 57artificial-analysis | — |
| MMLU | 88.1official | — |
| View GLM-5.3-Flash | View Step 3.5 Flash | |
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| Model | Input | Output | Total / mo | vs Best |
|---|---|---|---|---|
| GLM-5.3-FlashCheapest | $0.08 | $0.13 | $0.20 | — |
| Step 3.5 Flash | $0.10 | $0.15 | $0.25 | +25% |
Z.ai
GLM-5.3-Flash
GLM-5.3-Flash is Z.ai’s open-weight GLM-5 model for efficient coding, long-horizon agent tasks, and long-context multimodal reasoning. It uses a hybrid sparse and linear attention design with 320B total parameters and 18B active parameters.
StepFun
Step 3.5 Flash
Step 3.5 Flash is a large language model from StepFun. Supports up to 262,144 token context window. Available from $0.10/M input tokens.
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