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Claude Opus 5.5 vs GPT-6 Luna pricing

Prices

Claude Opus 5.5 and GPT-6 Luna prices, USD per 1M tokens
USD per 1M tokensClaude Opus 5.5GPT-6 Luna
Input$4.00$0.10
Output$20.00$0.50
Cache read$0.20$0.01
Cache write$5.00$0.125
Batch input$2.00$0.05
Batch output$10.00$0.25

Verified against the provider's official pricing page on Oct 9, 2026. Official pricing page

Monthly cost by workload

WorkloadClaude Opus 5.5GPT-6 Luna
Chatbot1,000 in / 500 out tokens, 10,000 requests a day$4,200/mo$105.00/mo
RAG8,000 in / 500 out tokens, 5,000 requests a day$6,300/mo$157.50/mo
Coding agent50,000 in / 2,000 out tokens, 1,000 requests a day, 80% cached input$2,640/mo$72.00/mo

Cost = input tokens × input price + output tokens × output price, 30 days a month. Cached input uses the cache read price. Cache write fees are not included.

Context and capabilities

Claude Opus 5.5GPT-6 Luna
Context1,000,000 tokens1,050,000 tokens
Max output128,000 tokens128,000 tokens
Inputtext, image, pdftext, image, pdf
Tool callingYesYes
ReasoningYesYes
Structured outputsYesYes

Questions

What is the price difference between Claude Opus 5.5 and GPT-6 Luna?
Claude Opus 5.5: $4.00 per 1M input tokens and $20.00 per 1M output tokens. GPT-6 Luna: $0.10 per 1M input tokens and $0.50 per 1M output tokens. For the Chatbot workload (1,000 in / 500 out tokens, 10,000 requests a day), that is about $4,200 per month for Claude Opus 5.5 and $105.00 for GPT-6 Luna.
Which has the longer context window, Claude Opus 5.5 or GPT-6 Luna?
GPT-6 Luna has the longer context window: up to 1,050,000 tokens, compared with 1,000,000 for Claude Opus 5.5.
Do Claude Opus 5.5 and GPT-6 Luna have prompt caching and batch prices?
Claude Opus 5.5: cached input $0.20 per 1M tokens; batch $2.00 per 1M input tokens and $10.00 per 1M output tokens. GPT-6 Luna: cached input $0.01 per 1M tokens; batch $0.05 per 1M input tokens and $0.25 per 1M output tokens.

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