GLM Flash Latest is $0.12 cheaper per 1M input tokens (62.5% lower; 2.67x difference).
API cost decision in 10 seconds
🔥GPT-5.6 Luna vs NewGLM Flash Latest
Pick GLM Flash Latest 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 Flash Latest when budget and context both matter.
On the standard 1M input plus 500K output workload, GLM Flash Latest is estimated at $0.2 vs $0.8 for GPT-5.6 Luna, saving $0.6 (75% lower).
Cost-first pickGLM Flash Latest
Context-first pickGLM Flash Latest
Sample savings$0.675%
10x traffic gap$6
GLM Flash Latest is cheaper on the standard workload and also has the larger context window. At 10x that traffic, the same price gap is about $6. Use the calculator below to replace the sample workload with your own token volume.
Cost sensitivity
Workload Sensitivity
GLM Flash Latest stays cheaper across input-heavy, balanced, and output-heavy sample workloads.
| Workload shape | Token mix | Better pick | GPT-5.6 Luna | GLM Flash Latest |
|---|---|---|---|---|
| Input-heavy / RAG | 5M input + 500K output | GLM Flash Latest | $1.6 | $0.5 |
| Balanced workload | 1M input + 1M output | GLM Flash Latest | $1.4 | $0.33 |
| Output-heavy chatbot | 1M input + 5M output | GLM Flash Latest | $6.2 | $1.32 |
GLM Flash Latest is $0.95 cheaper per 1M output tokens (79.2% lower; 4.8x difference).
GLM Flash Latest has 260.72K more context (1.25x larger).
GLM Flash Latest is $0.6 cheaper on the standard workload (75% 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 Flash Latest has the lower input price; GLM Flash Latest has the lower output price; GLM Flash Latest offers the larger context window. For the 1M input plus 500K output sample, GLM Flash Latest is cheaper for the standard workload.
For a 1M input token plus 500K output token workload, the estimated API cost is $0.8 for GPT-5.6 Luna and $0.2 for GLM Flash Latest.
Choose GPT-5.6 Luna when its provider, model quality, latency, or availability is more important than the numeric price/context winner.
Choose GLM Flash Latest when you care most about lower input-token price, lower output-token price, and larger context window.
- On the standard 1M input plus 500K output workload, GLM Flash Latest is estimated at $0.2 vs $0.8 for GPT-5.6 Luna, saving $0.6 (75% lower).
- GLM Flash Latest is $0.6 cheaper on the standard workload (75% lower).
- GLM Flash Latest is $0.12 cheaper per 1M input tokens (62.5% lower; 2.67x difference).
- GLM Flash Latest is $0.95 cheaper per 1M output tokens (79.2% lower; 4.8x difference).
- GLM Flash Latest has 260.72K more context (1.25x larger).
| Feature | 🔥GPT-5.6 Luna (OpenAI) | NewGLM Flash Latest (Z.ai) |
|---|---|---|
| Input Price prompt tokens per 1M | $0.2 | $0.075 |
| Completion Price per 1M tokens | $1.2 | $0.25 |
| Sample Workload Cost 1M input + 500K output | $0.8 | $0.2 |
| Context Window | 1.05M | 1.31M |
| Release Date | ||
| Popularity | #3 |
Use-Case Decision Matrix
| Use case | Better pick | Why |
|---|---|---|
| Budget-constrained production | GLM Flash Latest | On the standard 1M input plus 500K output workload, GLM Flash Latest is estimated at $0.2 vs $0.8 for GPT-5.6 Luna, saving $0.6 (75% lower). |
| High-volume input processing | GLM Flash Latest | Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill. |
| Long responses and chatbots | GLM Flash Latest | Lower output-token price matters most when assistants generate many completion tokens. |
| RAG or long-document work | GLM Flash Latest | A larger context window leaves more room for retrieved passages, conversation history, or source files. |
Related Alternatives
- gpt-oss-120b (free) can replace GPT-5.6 Luna when lower sample workload cost matters most: $0.
- gpt-oss-20b (free) can replace GPT-5.6 Luna when lower sample workload cost matters most: $0.
- gpt-oss-20b can replace GPT-5.6 Luna when lower sample workload cost matters most: $0.1.
- gpt-oss-120b can replace GPT-5.6 Luna when lower sample workload cost matters most: $0.12.
- No larger-context model is currently tracked within a close sample-cost band.
- DeepSeek V4 Flash 0731 · DeepSeek · #1
- GLM 5.3 Flash · Z.ai · #2
- MiMo-V2.5 · Xiaomi · #4
- Hy3 · Tencent · #5
Cheaper alternatives
Review low-cost models sorted by a standard 1M input plus 500K output workload.
Open cheapest modelsLarger context alternatives
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Review all tracked OpenAI models before deciding whether this matchup is the right shortlist.
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Open Z.ai modelsGPT-5.6 Luna is a fast, cost-efficient model in OpenAI's GPT-5.6 series. It is suited for high-volume, latency-sensitive tasks such as chat, classification, and lightweight agentic workflows, providing capable reasoning for...
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