# Arena.ai adds GPT-6 Sol and GPT-6 Luna to Agent Arena and Code Arena

OpenAI’s GPT-6 Sol and GPT-6 Luna can now be tested in Arena.ai’s Agent Arena, with scores still to come, and in Code Arena for WebDev, Text, Vision, Search, and Document. OpenAI says the models build on GPT-6 Astra and that their API prices are 50% lower than GPT-5.6 promotional pricing.

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Source: Arena.ai · Published 9/22/2026, 11:51:16

GPT-6 Sol and GPT-6 Luna are now available in Arena.ai’s Agent Arena. Votes will shape their evaluations, and scores are coming soon. Arena.ai says Agent Arena measures models on millions of real-world, long-horizon agentic tasks. Models can use web search, filesystem, and terminal tools, and the leaderboard compares outcomes with the average model using a causal tracing methodology.

The two models are also available in Code Arena for WebDev, Text, Vision, Search, and Document.

OpenAI says GPT-6 Sol and GPT-6 Luna build on advances behind GPT-6 Astra, bringing much of its strengths into faster and more affordable models for work at scale. OpenAI also says more efficient caching and inference come with API prices for the two models that are 50% lower than GPT-5.6 promotional pricing.

Tags: OpenAI, Arena.ai, GPT-6, Agent Arena, API pricing

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