LLM Comparison

Claude Opus 5 vs GPT-5.6 Luna

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

Price vs Intelligence

10082634526$2.45$6.71$10.97$15.24$19.50Avg Price per M tokensIntelligenceClaude Opus 596.6 / $15.00GPT-5.6 Luna36 / $3.50

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2/6 models
Same tier:
 AnthropicClaude Opus 5OpenAIGPT-5.6 Luna
OrganizationAnthropicAnthropicOpenAIOpenAI
OpenTools Score
97
6.4
36
10.3
FamilyClaude OpusGPT-5.6
StatusCurrentCurrent
Release DateJul 2026Jul 2026
Context Window1.0M tokens1.1M tokens
Input Price$5.00/M tokens$1.00/M tokens
Output Price$25.00/M tokens$6.00/M tokens
Pricing NotesClaude Opus 5 is priced at $5 per million input tokens and $25 per million output tokens; fast mode is priced separately at Fable-level rates.OpenAI pricing page lists $1 input and $6 output per 1M tokens, plus GPT-5.6 cache-write and cache-read pricing.
Capabilities
textvisionreasoningcodingtool-useagentslong-context
textvisionreasoningcodingtool-useweb-searchfile-searchcomputer-useagents
Max Output128K tokens128K tokens
API Identifierclaude-opus-5gpt-5.6-luna
Benchmarks
Artificial Analysis Intelligence Index
61artificial-analysis
51artificial-analysis
Artificial Analysis Coding Agent Index—
74.6artificial-analysis
 View Claude Opus 5View GPT-5.6 Luna

Cost Calculator

Enter your expected monthly token usage to compare costs.

ModelInputOutputTotal / movs Best
GPT-5.6 LunaCheapest$1.00$3.00$4.00—
Claude Opus 5$5.00$12.50$17.50+338%

Anthropic

Claude Opus 5

Claude Opus 5 is Anthropic's Opus-class model for complex agentic coding and enterprise work. Official Claude docs list the claude-opus-5 API ID, 1M token context window, 128k max output, adaptive thinking, and $5 input / $25 output pricing per million 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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