10 new gpt-5.6 models with 'luna', 'sol', and 'terra' prefixes and specialized 'xhigh' cap

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Jul 31, 2026 08:06 UTC lmarena lmarena.ai/leaderboard

10 new gpt-5.6 models with 'luna', 'sol', and 'terra' prefixes and specialized 'xhigh' capabilities (code, document, text, vision) appeared on the LMArena leaderboard.

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new gpt-5.6 models just popped up on lmarena! looks like 'luna', 'sol', and 'terra' are getting specialized xhigh versions for code, docs, text, and vision.

seeing some interesting gpt-5.6 variants on the lmarena leaderboard. 'xhigh' models for coding, documents, text, and vision with luna, sol, and terra names. something brewing?

LMArena: 10 new models appeared on the leaderboard (labs test unreleased models here — often weeks before launch) [named / preview] (10) + gpt-5.6-luna-xhigh-code-codex-harness-webdev + gpt-5.6-luna-xhigh-document + gpt-5.6-luna-xhigh-text + gpt-5.6-luna-xhigh-vision + gpt-5.6-sol-xhigh-document + gpt-5.6-sol-xhigh-vision + gpt-5.6-terra-xhigh-code-codex-harness-webdev + gpt-5.6-terra-xhigh-document + gpt-5.6-terra-xhigh-text + gpt-5.6-terra-xhigh-vision