LLM Comparison

DeepSeek V3.1 Terminus vs GPT-5.6 Luna

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

Price vs Intelligence

6254463830$0.35$0.49$0.63$0.77$0.91Avg Price per M tokensIntelligenceDeepSeek V3.1 Terminus40.4 / $0.50GPT-5.6 Luna52.3 / $0.70

Add to comparison

2/6 models
Same tier:
 DeepSeekDeepSeek V3.1 TerminusOpenAIGPT-5.6 Luna
OrganizationDeepSeekDeepSeekOpenAIOpenAI
OpenTools Score
40
80.8
52
74.7
FamilyDeepSeekGPT-5.6
StatusCurrentCurrent
Release DateSep 2025Jul 2026
Context Window164K tokens1.1M tokens
Input Price$0.21/M tokens$0.20/M tokens
Output Price$0.79/M tokens$1.20/M tokens
Pricing NotesCache read: $0.1300/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 Output—128K tokens
API Identifierdeepseek/deepseek-v3.1-terminusgpt-5.6-luna
Benchmarks
MMLU-Pro
85deepseek
—
GPQA Diamond
80.7deepseek
91.1111artificial-analysis
AIME 2025
53.7deepseek
—
LiveCodeBench
74.9deepseek
—
SWE-bench Verified
68.4deepseek
—
Terminal-Bench Hard
31.8deepseek
—
HLE
21.7deepseek
—
Artificial Analysis Intelligence Index—
51artificial-analysis
Artificial Analysis Coding Agent Index—
74.6artificial-analysis
Artificial Analysis Intelligence Index v4.3—
37.5048artificial-analysis
SciCode—
53.588artificial-analysis
Terminal-Bench 2.1—
80.8989artificial-analysis
 View DeepSeek V3.1 TerminusView GPT-5.6 Luna

Cost Calculator

Enter your expected monthly token usage to compare costs.

ModelInputOutputTotal / movs Best
DeepSeek V3.1 TerminusCheapest$0.21$0.40$0.61—
GPT-5.6 Luna$0.20$0.60$0.80+32%

DeepSeek

DeepSeek V3.1 Terminus

DeepSeek V3.1 Terminus is a large language model from DeepSeek. Supports up to 163,840 token context window. Achieves 87.1% on MMLU. Available from $0.21/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.

More Comparisons

Flagship

Claude Opus 5 vs Gemini 3.6 Flash

Flagship

Claude Opus 5 vs GPT-5.6 Sol

Flagship

Claude Opus 5 vs Palmyra X5

Flagship

Claude Opus 5 vs Jamba Large 1.7

Flagship

Claude Opus 5 vs Command A

Flagship

Claude Opus 5 vs Sonar Deep Research

Looking for more AI models?

Browse All LLMs