LLM Comparison

GLM 5.1 vs GPT-5.6 Luna

Side-by-side specs, pricing & capabilities · Updated September 2026

Price vs Intelligence

6560544842$0.49$1.03$1.58$2.12$2.67Avg Price per M tokensIntelligenceGLM 5.155.4 / $2.05GPT-5.6 Luna52.3 / $0.70

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2/6 models
Same tier:
 Z.aiGLM 5.1OpenAIGPT-5.6 Luna
OrganizationZ.aiZ.aiOpenAIOpenAI
OpenTools Score
55
27.0
52
74.7
FamilyGLMGPT-5.6
StatusCurrentCurrent
Release DateApr 2026Jul 2026
Context Window203K tokens1.1M tokens
Input Price$0.95/M tokens$0.20/M tokens
Output Price$3.15/M tokens$1.20/M tokens
Pricing NotesCache read: $0.4750/M tokensOpenAI pricing page lists $1 input and $6 output per 1M tokens, plus GPT-5.6 cache-write and cache-read pricing.
Capabilities
textcode
textvisionreasoningcodingtool-useweb-searchfile-searchcomputer-useagents
Training Cutoff—Feb 16, 2026
Max Output66K tokens128K tokens
API Identifierz-ai/glm-5.1gpt-5.6-luna
Benchmarks
GPQA Diamond
86.2https://huggingface.co/zai-org/GLM-5.1
91.1111artificial-analysis
Artificial Analysis Intelligence Index v4.3
26.4455artificial-analysis
37.5048artificial-analysis
SciCode
44.7917artificial-analysis
53.588artificial-analysis
Terminal-Bench 2.1
61.7978artificial-analysis
80.8989artificial-analysis
Artificial Analysis Intelligence Index—
51artificial-analysis
Artificial Analysis Coding Agent Index—
74.6artificial-analysis
 View GLM 5.1View GPT-5.6 Luna

Cost Calculator

Enter your expected monthly token usage to compare costs.

ModelInputOutputTotal / movs Best
GPT-5.6 LunaCheapest$0.20$0.60$0.80—
GLM 5.1$0.95$1.58$2.53+216%

Z.ai

GLM 5.1

GLM 5.1 is a large language model from Z.ai. Supports up to 202,752 token context window. Available from $0.95/M input tokens.

OpenAI

GPT-5.6 Luna

GPT-5.6 Luna is OpenAI lower-cost GPT-5.6 model for high-volume reasoning, coding, and agentic workloads. OpenAI model docs list the same 1.05M token context window, 128K max output, and major tool support as the larger GPT-5.6 variants.

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