GLM 5.3 FlashX Legal is $1.63 cheaper per 1M input tokens (81.5% lower; 5.41x difference).
API cost decision in 10 seconds
NewGLM 5.3 FlashX Legal vs Claude Opus 5.5 (batch)
Pick GLM 5.3 FlashX Legal when budget and context both matter.
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 and context both matter.
On the standard 1M input plus 500K output workload, GLM 5.3 FlashX Legal is estimated at $0.99 vs $7 for Claude Opus 5.5 (batch), saving $6 (85.8% lower).
Cost-first pickGLM 5.3 FlashX Legal
Context-first pickGLM 5.3 FlashX Legal
Sample savings$685.8%
10x traffic gap$60.05
GLM 5.3 FlashX Legal is cheaper on the standard workload and also has the larger context window. At 10x that traffic, the same price gap is about $60.05. 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 | Claude Opus 5.5 (batch) |
|---|---|---|---|---|
| Input-heavy / RAG | 5M input + 500K output | GLM 5.3 FlashX Legal | $2.48 | $15 |
| Balanced workload | 1M input + 1M output | GLM 5.3 FlashX Legal | $1.62 | $12 |
| Output-heavy chatbot | 1M input + 5M output | GLM 5.3 FlashX Legal | $6.62 | $52 |
GLM 5.3 FlashX Legal is $8.75 cheaper per 1M output tokens (87.5% lower; 8x difference).
GLM 5.3 FlashX Legal has 48.58K more context (1.05x larger).
GLM 5.3 FlashX Legal is $6 cheaper on the standard workload (85.8% 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; GLM 5.3 FlashX Legal offers the larger 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 $7 for Claude Opus 5.5 (batch).
Choose GLM 5.3 FlashX Legal when you care most about lower input-token price, lower output-token price, and larger context window.
Choose Claude Opus 5.5 (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 $7 for Claude Opus 5.5 (batch), saving $6 (85.8% lower).
- GLM 5.3 FlashX Legal is $6 cheaper on the standard workload (85.8% lower).
- GLM 5.3 FlashX Legal is $1.63 cheaper per 1M input tokens (81.5% lower; 5.41x difference).
- GLM 5.3 FlashX Legal is $8.75 cheaper per 1M output tokens (87.5% lower; 8x difference).
- GLM 5.3 FlashX Legal has 48.58K more context (1.05x larger).
| Feature | NewGLM 5.3 FlashX Legal (Z.ai) | Claude Opus 5.5 (batch) (Anthropic) |
|---|---|---|
| Input Price prompt tokens per 1M | $0.37 | $2 |
| Completion Price per 1M tokens | $1.25 | $10 |
| Sample Workload Cost 1M input + 500K output | $0.99 | $7 |
| Context Window | 1.05M | 1M |
| 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 $7 for Claude Opus 5.5 (batch), saving $6 (85.8% 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 | GLM 5.3 FlashX Legal | 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.
- Grok 4.20 Multi-Agent offers 2M context with $2.5 sample workload cost.
- Grok 4.20 offers 2M context with $2.5 sample workload cost.
- 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.
- 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 modelsAnthropic catalog
Check other Anthropic models with comparable pricing, context, or release timing.
Open Anthropic 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...
Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5. It is particularly strong at multi-step changes in large codebases, code...