API cost decision in 10 seconds

GPT Luna Latest vs GLM Flash Latest

Pick GLM Flash Latest for lower cost; pick GPT Luna Latest only if the larger context window matters more.

Page updated:  Data confirmed:  Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output

Budget verdict

Pick GLM Flash Latest for lower cost; pick GPT Luna Latest only if the larger context window matters more.

On the standard 1M input plus 500K output workload, GLM Flash Latest is estimated at $0.08 vs $0.35 for GPT Luna Latest, saving $0.27 (76.6% lower).

Cost-first pickGLM Flash Latest
Context-first pickGPT Luna Latest
Sample savings$0.2776.6%
10x traffic gap$2.68

GPT Luna Latest has more context, but GLM Flash Latest saves $0.27 on the standard workload. At 10x that traffic, the same price gap is about $2.68. Use the calculator below to replace the sample workload with your own token volume.

Cost sensitivity

Workload Sensitivity

Same prices, different token mixes.

GLM Flash Latest stays cheaper across input-heavy, balanced, and output-heavy sample workloads.

Workload shapeToken mixBetter pickGPT Luna LatestGLM Flash Latest
Input-heavy / RAG5M input + 500K outputGLM Flash Latest$0.75$0.26
Balanced workload1M input + 1M outputGLM Flash Latest$0.6$0.12
Output-heavy chatbot1M input + 5M outputGLM Flash Latest$2.6$0.41
Cheaper input GLM Flash Latest $0.1 vs $0.0452 / 1M

GLM Flash Latest is $0.05 cheaper per 1M input tokens (54.8% lower; 2.21x difference).

Cheaper output GLM Flash Latest $0.5 vs $0.0737 / 1M

GLM Flash Latest is $0.43 cheaper per 1M output tokens (85.3% lower; 6.78x difference).

Larger context GPT Luna Latest 1.05M vs 1.05M

GPT Luna Latest has 1.42K more context (1x larger).

Sample workload GLM Flash Latest $0.35 vs $0.08

GLM Flash Latest is $0.27 cheaper on the standard workload (76.6% lower).

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.
GPT Luna Latest Calculating… Estimated API cost
GLM Flash Latest Calculating… Estimated API cost
Cheaper for this workload Calculating… Difference: calculating…

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

Verdict

GLM Flash Latest has the lower input price; GLM Flash Latest has the lower output price; GPT Luna 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 $0.35 for GPT Luna Latest and $0.08 for GLM Flash Latest.

Best Fit

Choose GPT Luna Latest when you care most about larger context window.

Choose GLM Flash Latest when you care most about lower input-token price, and lower output-token price.

Decision Notes
  • On the standard 1M input plus 500K output workload, GLM Flash Latest is estimated at $0.08 vs $0.35 for GPT Luna Latest, saving $0.27 (76.6% lower).
  • GLM Flash Latest is $0.27 cheaper on the standard workload (76.6% lower).
  • GLM Flash Latest is $0.05 cheaper per 1M input tokens (54.8% lower; 2.21x difference).
  • GLM Flash Latest is $0.43 cheaper per 1M output tokens (85.3% lower; 6.78x difference).
  • GPT Luna Latest has 1.42K more context (1x larger).
Head-to-Head Specs
FeatureGPT Luna Latest
(OpenAI)		GLM Flash Latest
(Z.ai)
Input Price
prompt tokens per 1M		$0.1$0.0452
Completion Price
per 1M tokens		$0.5$0.0737
Sample Workload Cost
1M input + 500K output		$0.35$0.08
Context Window1.05M1.05M
Release Date

Use-Case Decision Matrix

Use caseBetter pickWhy
Budget-constrained productionGLM Flash LatestOn the standard 1M input plus 500K output workload, GLM Flash Latest is estimated at $0.08 vs $0.35 for GPT Luna Latest, saving $0.27 (76.6% lower).
High-volume input processingGLM Flash LatestLower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbotsGLM Flash LatestLower output-token price matters most when assistants generate many completion tokens.
RAG or long-document workGPT Luna LatestA larger context window leaves more room for retrieved passages, conversation history, or source files.

Related Alternatives

Same-provider lower-cost swaps
  • gpt-oss-120b (free) can replace GPT Luna Latest when lower sample workload cost matters most: $0.
  • gpt-oss-20b (free) can replace GPT Luna Latest when lower sample workload cost matters most: $0.
  • gpt-oss-20b can replace GPT Luna Latest when lower sample workload cost matters most: $0.06.
  • gpt-oss-20b (batch) can replace GPT Luna Latest when lower sample workload cost matters most: $0.08.
Larger context near this budget
  • Llama 4 Scout offers 1.31M context with $0.25 sample workload cost.

Cheaper alternatives

Review low-cost models sorted by a standard 1M input plus 500K output workload.

Open cheapest models

Larger context alternatives

Find models with larger context windows for RAG, long documents, and codebase review.

Open largest context models

Provider catalogs

Compare models within provider hubs before choosing a final API vendor.

Open provider hubs

OpenAI catalog

Review all tracked OpenAI models before deciding whether this matchup is the right shortlist.

Open OpenAI models

Z.ai catalog

Check other Z.ai models with comparable pricing, context, or release timing.

Open Z.ai models
GPT Luna Latest

This model always redirects to the latest model in the GPT Luna family.

GLM Flash Latest

This model always redirects to the latest model in the GLM Flash family.