GLM 5.3 is $0.29 cheaper per 1M input tokens (78.4% lower; 4.62x difference).
API cost decision in 10 seconds
🔥GLM 5.3 vs NewGLM 5.3 FlashX Legal
Pick GLM 5.3 FlashX Legal when budget is the priority.
Page updated:
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 $1.88 for GLM 5.3, saving $0.89 (47.1% lower).
Cost-first pickGLM 5.3 FlashX Legal
Context-first pickBoth models
Sample savings$0.8947.1%
10x traffic gap$8.85
The reported context window is tied, so cost and provider fit carry more weight. At 10x that traffic, the same price gap is about $8.85. Use the calculator below to replace the sample workload with your own token volume.
Cost sensitivity
Workload Sensitivity
Cost winner changes by workload shape: input-heavy / RAG favors GLM 5.3, balanced workload favors GLM 5.3 FlashX Legal, and output-heavy chatbot favors GLM 5.3 FlashX Legal.
| Workload shape | Token mix | Better pick | GLM 5.3 | GLM 5.3 FlashX Legal |
|---|---|---|---|---|
| Input-heavy / RAG | 5M input + 500K output | GLM 5.3 | $2.2 | $2.48 |
| Balanced workload | 1M input + 1M output | GLM 5.3 FlashX Legal | $3.68 | $1.62 |
| Output-heavy chatbot | 1M input + 5M output | GLM 5.3 FlashX Legal | $18.08 | $6.62 |
GLM 5.3 FlashX Legal is $2.35 cheaper per 1M output tokens (65.3% lower; 2.88x difference).
Both models report the same context window at 1.05M tokens.
GLM 5.3 FlashX Legal is $0.89 cheaper on the standard workload (47.1% 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 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 $1.88 for GLM 5.3 and $0.99 for GLM 5.3 FlashX Legal.
Choose GLM 5.3 when you care most about lower input-token price.
Choose GLM 5.3 FlashX Legal when you care most about lower output-token price.
- On the standard 1M input plus 500K output workload, GLM 5.3 FlashX Legal is estimated at $0.99 vs $1.88 for GLM 5.3, saving $0.89 (47.1% lower).
- GLM 5.3 FlashX Legal is $0.89 cheaper on the standard workload (47.1% lower).
- GLM 5.3 is $0.29 cheaper per 1M input tokens (78.4% lower; 4.62x difference).
- GLM 5.3 FlashX Legal is $2.35 cheaper per 1M output tokens (65.3% lower; 2.88x difference).
- Both models report the same context window at 1.05M tokens.
| Feature | 🔥GLM 5.3 (Z.ai) | NewGLM 5.3 FlashX Legal (Z.ai) |
|---|---|---|
| Input Price prompt tokens per 1M | $0.08 | $0.37 |
| Completion Price per 1M tokens | $3.6 | $1.25 |
| Sample Workload Cost 1M input + 500K output | $1.88 | $0.99 |
| Context Window | 1.05M | 1.05M |
| Release Date | ||
| Popularity | #11 |
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 $1.88 for GLM 5.3, saving $0.89 (47.1% lower). |
| High-volume input processing | GLM 5.3 | 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 when lower sample workload cost matters most: $0.
- GLM 4.5 Air (free) can replace GLM 5.3 when lower sample workload cost matters most: $0.
- GLM 5.3 Flash can replace GLM 5.3 when lower sample workload cost matters most: $0.07.
- GLM Flash Latest can replace GLM 5.3 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-6.1 Terra Pro (batch) offers 1.05M context with $1.75 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
Review low-cost models sorted by a standard 1M input plus 500K output workload.
Open cheapest modelsLarger context alternatives
Find models with larger context windows for RAG, long documents, and codebase review.
Open largest context modelsProvider catalogs
Compare models within provider hubs before choosing a final API vendor.
Open provider hubsZ.ai catalog
Review all tracked Z.ai models before deciding whether this matchup is the right shortlist.
Open Z.ai modelsGLM-5.3 is a large-scale reasoning model from Z.ai, built for complex software engineering and long-horizon agent tasks. It supports text input and output with a 1M-token context window, and improves...
GLM-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...