Comparing 6

GPT-6 LunavsGPT-6.1 SolvsGPT-6 AstravsClaude Haiku 5.5vsClaude Sonnet 5.5vsClaude Opus 5.5

Send one prompt to every model and read the answers side by side, with speed and cost for each.

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Highlighted values are the best among your picks.

GPT-6 LunaOpen AINEW

OpenAI's most efficient model for focused, high-volume tasks

GPT-6.1 SolOpen AINEW

Near-Astra performance for complex coding, computer use, and professional work at a lower cost.

GPT-6 AstraOpen AI

GPT-6 Astra is OpenAI's most capable model for complex reasoning, coding, computer use, research, and document creation.

Claude Haiku 5.5AnthropicNEW

Fast Claude model for responsive assistance, classification, and lightweight agents

Claude Sonnet 5.5AnthropicNEW

Fast Claude model for everyday coding, agents, and knowledge work

Claude Opus 5.5AnthropicNEW

Claude model for long-running agentic coding and knowledge work

Intelligence
Intelligence index38.151.852.743.45657.6
Price
Input, $ per 1M$0.10$2$10$0.10$2$4
Output, $ per 1M$0.50$10$50$0.50$10$20
Typical message (500 in / 250 out)$0.00017$0.0035$0.0175$0.00017$0.0035$0.0070
Repeated input, cached$0.01 · 10× cheaper$0.10 · 20× cheaper$1 · 10× cheaper$0.01 · 10× cheaper$0.10 · 20× cheaper$0.20 · 20× cheaper
Prompts over 200K tokens$0.20 / $0.75$4 / $15$20 / $75Same priceSame priceSame price
Limits
Context window1.05M1.05M1.05M1M1M1M
Longest answer128K tokens128K tokens128K tokens128K tokens128K tokens128K tokens
Knowledge cutoffMay 2026Apr 2026Apr 2026Jun 2026Jun 2026Jun 2026
What it can take and do
AcceptsTextImagePDFTextImagePDFTextImagePDFTextImagePDFTextImagePDFTextImagePDF
Reasoning effortOff · Low · Med · High · X-high · MaxLow · Med · High · X-high · MaxLow · Med · High · X-high · MaxLow · Med · High · X-high · MaxLow · Med · High · X-high · MaxLow · Med · High · X-high · Max
Tool useYesYesYesYesYesYes
Guaranteed JSON outputYesYesYesYesYesYes
Availability
Released22 Sept 202629 Sept 20264 Sept 20267 Oct 202628 Sept 202622 Sept 2026
Open weightsNoNoNoNoNoNo
API providers offering it363335333436