GLM 5.3 FlashX Legal is $0.005 cheaper per 1M input tokens (1.3% lower; 1.01x difference).
API cost decision in 10 seconds
NewGLM 5.3 FlashX Legal vs Gemini 3.8 Flash (batch)
Pick GLM 5.3 FlashX Legal when budget is the priority.
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Data confirmed:
Prices normalized to USD per 1M tokens
Sample workload: 1M input + 500K output
Budget verdict
Pick GLM 5.3 FlashX Legal when budget is the priority.
On the standard 1M input plus 500K output workload, GLM 5.3 FlashX Legal is estimated at $0.99 vs $1.31 for Gemini 3.8 Flash (batch), saving $0.32 (24.2% lower).
Cost-first pickGLM 5.3 FlashX Legal
Context-first pickBoth models
Sample savings$0.3224.2%
10x traffic gap$3.17
The reported context window is tied, so cost and provider fit carry more weight. At 10x that traffic, the same price gap is about $3.17. Use the calculator below to replace the sample workload with your own token volume.
Cost sensitivity
Workload Sensitivity
GLM 5.3 FlashX Legal stays cheaper across input-heavy, balanced, and output-heavy sample workloads.
| Workload shape | Token mix | Better pick | GLM 5.3 FlashX Legal | Gemini 3.8 Flash (batch) |
|---|---|---|---|---|
| Input-heavy / RAG | 5M input + 500K output | GLM 5.3 FlashX Legal | $2.48 | $2.81 |
| Balanced workload | 1M input + 1M output | GLM 5.3 FlashX Legal | $1.62 | $2.25 |
| Output-heavy chatbot | 1M input + 5M output | GLM 5.3 FlashX Legal | $6.62 | $9.75 |
GLM 5.3 FlashX Legal is $0.62 cheaper per 1M output tokens (33.3% lower; 1.5x difference).
Both models report the same context window at 1.05M tokens.
GLM 5.3 FlashX Legal is $0.32 cheaper on the standard workload (24.2% lower).
Estimate your workload cost
Your Workload Cost
This estimate uses normalized public API pricing per 1M tokens. It is a planning aid, not a billing quote. Verify provider pricing, limits, and terms before production use.
Quick Decision
GLM 5.3 FlashX Legal has the lower input price; GLM 5.3 FlashX Legal has the lower output price; both models report the same context window. For the 1M input plus 500K output sample, GLM 5.3 FlashX Legal is cheaper for the standard workload.
For a 1M input token plus 500K output token workload, the estimated API cost is $0.99 for GLM 5.3 FlashX Legal and $1.31 for Gemini 3.8 Flash (batch).
Choose GLM 5.3 FlashX Legal when you care most about lower input-token price, and lower output-token price.
Choose Gemini 3.8 Flash (batch) when its provider, model quality, latency, or availability is more important than the numeric price/context winner.
- On the standard 1M input plus 500K output workload, GLM 5.3 FlashX Legal is estimated at $0.99 vs $1.31 for Gemini 3.8 Flash (batch), saving $0.32 (24.2% lower).
- GLM 5.3 FlashX Legal is $0.32 cheaper on the standard workload (24.2% lower).
- GLM 5.3 FlashX Legal is $0.005 cheaper per 1M input tokens (1.3% lower; 1.01x difference).
- GLM 5.3 FlashX Legal is $0.62 cheaper per 1M output tokens (33.3% lower; 1.5x difference).
- Both models report the same context window at 1.05M tokens.
| Feature | NewGLM 5.3 FlashX Legal (Z.ai) | Gemini 3.8 Flash (batch) (Google) |
|---|---|---|
| Input Price prompt tokens per 1M | $0.37 | $0.375 |
| Completion Price per 1M tokens | $1.25 | $1.875 |
| Sample Workload Cost 1M input + 500K output | $0.99 | $1.31 |
| Context Window | 1.05M | 1.05M |
| Release Date |
Use-Case Decision Matrix
| Use case | Better pick | Why |
|---|---|---|
| Budget-constrained production | GLM 5.3 FlashX Legal | On the standard 1M input plus 500K output workload, GLM 5.3 FlashX Legal is estimated at $0.99 vs $1.31 for Gemini 3.8 Flash (batch), saving $0.32 (24.2% lower). |
| High-volume input processing | GLM 5.3 FlashX Legal | Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill. |
| Long responses and chatbots | GLM 5.3 FlashX Legal | Lower output-token price matters most when assistants generate many completion tokens. |
| RAG or long-document work | Tie | A larger context window leaves more room for retrieved passages, conversation history, or source files. |
Related Alternatives
- GLM 5.2 (free) can replace GLM 5.3 FlashX Legal when lower sample workload cost matters most: $0.
- GLM 4.5 Air (free) can replace GLM 5.3 FlashX Legal when lower sample workload cost matters most: $0.
- GLM 5.3 Flash can replace GLM 5.3 FlashX Legal when lower sample workload cost matters most: $0.07.
- GLM Flash Latest can replace GLM 5.3 FlashX Legal when lower sample workload cost matters most: $0.07.
- Llama 4 Scout offers 1.31M context with $0.25 sample workload cost.
- GPT-6 Luna offers 1.05M context with $0.35 sample workload cost.
- GPT-5.6 Luna offers 1.05M context with $0.8 sample workload cost.
- GPT-6 Luna Pro offers 1.05M context with $0.35 sample workload cost.
- Kimi K3.1 Pro · MoonshotAI · #1
- DeepSeek V4.1 Flash 1017 · DeepSeek · #2
- GLM 5.3 Flash · Z.ai · #3
- DeepSeek V4.1 Flash · DeepSeek · #4
Cheaper alternatives
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Open provider hubsZ.ai catalog
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Open Z.ai modelsGoogle catalog
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Open Google modelsGLM-5.3-FlashX-Legal (GLM-Legal) is Z.ai's legal-domain variant of GLM-5.3-FlashX, a native multimodal model that accepts text, image, and video input and produces text. It adds legal-domain mid-training and post-training with reinforcement...
Gemini 3.8 Flash is Google's most intelligent Flash model with significant gains from 3.7 Flash across software engineering, agentic tasks, and multi-step reasoning.